Table Of Content

Page 1 Table of Contents Introduction................................................................................................................................18 Overview....................................................................................................................................19 The ESP8266........................................................................................................................20 Maturity.................................................................................................................................20 The specification...................................................................................................................21 ESP8266 Modules.................................................................................................................22 ESP-12.............................................................................................................................22 ESP-1...............................................................................................................................26 Adafruit HUZZAH..............................................................................................................32 NodeMCU.........................................................................................................................32 node.IT (aka ESP-210).....................................................................................................32 SparkFun WiFi Shield – ESP8266....................................................................................32 Connecting to the ESP8266.......................................................................................................33 WiFi Theory...............................................................................................................................34 AT Command Programming.......................................................................................................36 Commands............................................................................................................................37 Assembling circuits....................................................................................................................42 USB to UART converters.......................................................................................................43 Breadboards..........................................................................................................................44 Power....................................................................................................................................45 Multi-meter / Logic probe / Logic Analyzer.............................................................................45 Sundry components..............................................................................................................46 Physical construction.............................................................................................................46 Recommended setup for programming ESP8266.................................................................46 Configuration for flashing the device.....................................................................................49 Programming.............................................................................................................................50 Boot mode.............................................................................................................................50 The ESP8266 SDK................................................................................................................51 Include directories.............................................................................................................51 Compiling..............................................................................................................................52 Loading a program into the ESP8266...............................................................................59 Programming environments..............................................................................................63 Compilation tools..............................................................................................................63 ar..................................................................................................................................63 esptool.py.....................................................................................................................63 esptool-ck.....................................................................................................................65 gcc...............................................................................................................................67 gen_appbin.py..............................................................................................................68 make............................................................................................................................69 nm................................................................................................................................69 objcopy.........................................................................................................................70 Page 2 objdump.......................................................................................................................70 xxd...............................................................................................................................70 Linking...................................................................................................................................70 Debugging.............................................................................................................................72 Logging to UART1............................................................................................................72 Run a Blinky.....................................................................................................................72 Dumping IP Addresses.....................................................................................................73 Exception handling...........................................................................................................74 Debugging and testing TCP and UDP connections...........................................................75 Android – Socket Protocol............................................................................................75 Android – UDP Sender/Receiver..................................................................................75 Windows – Hercules....................................................................................................76 Curl..............................................................................................................................76 Architecture...........................................................................................................................76 Custom programs.............................................................................................................76 WiFi at startup.......................................................................................................................77 Working with WiFi..................................................................................................................77 Scanning for access points...............................................................................................77 Defining the operating mode.............................................................................................78 Handling WiFi events........................................................................................................79 Station configuration.........................................................................................................80 Connecting to an access point..........................................................................................81 Control and data flows when connecting as a station.......................................................81 Being an access point.......................................................................................................82 The DHCP server.............................................................................................................83 Current IP Address, netmask and gateway.......................................................................84 WiFi Protected Setup – WPS............................................................................................84 Working with TCP/IP.............................................................................................................85 The ESPConn architecture...............................................................................................85 TCP..................................................................................................................................86 Sending and receiving TCP data..................................................................................90 TCP Error handling.......................................................................................................91 UDP..................................................................................................................................92 Broadcast with UDP.....................................................................................................95 Ping request.....................................................................................................................95 Name Service...................................................................................................................95 Multicast Domain Name Systems.....................................................................................96 Working with SNTP...........................................................................................................96 ESP-NOW.............................................................................................................................97 GPIOs...................................................................................................................................98 Expanding the number of available GPIOs.....................................................................104 ESP_PCF8574 library................................................................................................107 Working with I2C.................................................................................................................108 Working with SPI – Serial Peripheral Interface....................................................................110 Page 3 Working with serial...............................................................................................................112 Task handling.......................................................................................................................113 Timers and time...................................................................................................................114 Working with memory..........................................................................................................114 Pulse Width Modulation – PWM..........................................................................................119 Analog to digital conversion.................................................................................................120 Sleep modes.......................................................................................................................122 Watchdog timer...................................................................................................................123 Security...............................................................................................................................124 Mapping from Arduino.........................................................................................................124 Partner TCP/IP APIs................................................................................................................125 Java Sockets.......................................................................................................................126 WebSockets........................................................................................................................129 Programming using Eclipse.....................................................................................................129 Installing the Eclipse Serial terminal....................................................................................132 Programming using the Arduino IDE........................................................................................139 Implications of Arduino IDE support.....................................................................................140 Installing the Arduino IDE with ESP8266 support................................................................141 Tips for working in the Arduino environment........................................................................147 Initialize global classes in setup()....................................................................................147 Invoking Espressif SDK API from a sketch......................................................................147 Exception handling.........................................................................................................148 The SPIFFS file system.......................................................................................................148 The mkspiffs command...................................................................................................148 The architecture of the Arduino IDE support........................................................................149 Building ESP Arduino apps using the Eclipse IDE...............................................................156 Reasons to consider using Eclipse over Arduino IDE.....................................................170 Notes on using the Eclipse Arduino package..................................................................171 Arduino ESP Libraries.........................................................................................................172 The WiFi library...............................................................................................................172 WiFi.begin..................................................................................................................172 WiFi.beingSmartConfig..............................................................................................173 WiFi.beginWPSConfig................................................................................................173 WiFi.BSSID................................................................................................................173 WiFi.BSSIDstr............................................................................................................173 WiFi channel..............................................................................................................173 WiFi.config.................................................................................................................173 WiFi.disconnect..........................................................................................................174 WiFi.encryptionType...................................................................................................174 WiFi.gatewayIP..........................................................................................................174 WiFi.getNetworkInfo...................................................................................................174 WiFi.hostByName......................................................................................................175 WiFi.hostname...........................................................................................................175 WiFi.isHidden.............................................................................................................175 Page 4 WiFi.localIP................................................................................................................175 WiFi.macAddress.......................................................................................................175 WiFi.mode..................................................................................................................175 WiFi.printDiag.............................................................................................................176 WiFi.RSSI...................................................................................................................176 WiFi.scanComplete....................................................................................................176 WiFi.scanDelete.........................................................................................................177 WiFi.scanNetworks.....................................................................................................177 WiFi.smartConfigDone...............................................................................................177 WiFi.softAP................................................................................................................177 WiFi.softAPConfig......................................................................................................178 WiFi.softAPdisconnect...............................................................................................178 WiFi.softAPmacAddress.............................................................................................178 WiFi.softAPIP.............................................................................................................178 WiFi.SSID...................................................................................................................178 WiFi.status.................................................................................................................178 WiFi.stopSmartConfig................................................................................................179 WiFi.subnetMask........................................................................................................179 WiFi.waitForConnectResult........................................................................................179 WiFiClient.......................................................................................................................179 WiFiClient...................................................................................................................179 WiFiClient.available....................................................................................................179 WiFiClient.connect.....................................................................................................180 WiFiClient.connected.................................................................................................180 WiFiClient.flush..........................................................................................................180 WiFiClient.getNoDelay...............................................................................................180 WiFiClient.peek..........................................................................................................180 WiFiClient.read...........................................................................................................180 WiFiClient.remoteIP...................................................................................................180 WiFiClient.remotePort................................................................................................181 WiFiClient.setLocalPortStart......................................................................................181 WiFiClient.setNoDelay...............................................................................................181 WiFiClient.status........................................................................................................181 WiFiClient.stop...........................................................................................................181 WiFiClient.stopAll.......................................................................................................181 WiFiClient.write..........................................................................................................181 WiFiServer......................................................................................................................182 WiFiServer.................................................................................................................182 WiFiServer.available...................................................................................................182 WiFiServer.begin........................................................................................................182 WiFiServer.getNoDelay..............................................................................................182 WiFiServer.hasClient..................................................................................................182 WiFiServer.setNoDelay..............................................................................................182 WiFiServer.status.......................................................................................................182 Page 5 WiFiServer.write.........................................................................................................182 IPAddress.......................................................................................................................183 ESP8266WebServer.......................................................................................................183 ESP8266WebServer..................................................................................................185 ESP8266WebServer.arg............................................................................................186 ESP8266WebServer.argName...................................................................................186 ESP8266WebServer.args..........................................................................................186 ESP8266WebServer.begin.........................................................................................186 ESP8266WebServer.client.........................................................................................186 ESP8266WebServer.handleClient..............................................................................186 ESP8266WebServer.hasArg......................................................................................186 ESP8266WebServer.method......................................................................................187 ESP8266WebServer.on.............................................................................................187 ESP8266WebServer.onFileUpload............................................................................187 ESP8266WebServer.onNotFound..............................................................................187 ESP8266WebServer.send..........................................................................................188 ESP8266WebServer.sendContent.............................................................................188 ESP8266WebServer.sendHeader..............................................................................188 ESP8266WebServer.setContentLength.....................................................................188 ESP8266WebServer.streamFile.................................................................................188 ESP8266WebServer.upload.......................................................................................188 ESP8266WebServer.uri.............................................................................................188 ESP8266mDNS library...................................................................................................189 MDNS.addService......................................................................................................189 MDNS.begin...............................................................................................................189 MDNS.update.............................................................................................................189 I2C – Wire.......................................................................................................................189 Wire.available.............................................................................................................190 Wire.begin..................................................................................................................190 Wire.beginTransmission.............................................................................................191 Wire.endTransmission................................................................................................191 Wire.flush...................................................................................................................191 Wire.onReceive..........................................................................................................191 Wire.onReceiveService..............................................................................................191 Wire.onRequest.........................................................................................................192 Wire.onRequestService..............................................................................................192 Wire.peek...................................................................................................................192 Wire.pins....................................................................................................................192 Wire.read...................................................................................................................192 Wire.requestFrom......................................................................................................193 Wire.setClock.............................................................................................................193 Wire.write...................................................................................................................193 Ticker library...................................................................................................................193 Ticker.........................................................................................................................194 Page 6 attach.........................................................................................................................194 attach_ms..................................................................................................................194 detach........................................................................................................................194 once...........................................................................................................................195 once_ms....................................................................................................................195 EEPROM library.............................................................................................................195 EEPROM.begin..........................................................................................................195 EEPROM.commit.......................................................................................................195 EEPROM.end.............................................................................................................195 EEPROM.get..............................................................................................................196 EEPROM.getDataPtr..................................................................................................196 EEPROM.put..............................................................................................................196 EEPROM.read...........................................................................................................196 EEPROM.write...........................................................................................................196 SPIFFS...........................................................................................................................196 SPIFFS.begin.............................................................................................................196 SPIFFS.open..............................................................................................................197 SPIFFS.openDir.........................................................................................................197 SPIFFS.remove..........................................................................................................197 SPIFFS.rename.........................................................................................................197 File.available..............................................................................................................197 File.close....................................................................................................................198 File.flush.....................................................................................................................198 File.name...................................................................................................................198 File.peek....................................................................................................................198 File.position................................................................................................................198 File.read.....................................................................................................................198 File.seek.....................................................................................................................198 File.size......................................................................................................................199 File.write.....................................................................................................................199 Dir.fileName................................................................................................................199 Dir.next.......................................................................................................................199 Dir.open......................................................................................................................199 Dir.openDir.................................................................................................................199 Dir.remove..................................................................................................................199 Dir.rename..................................................................................................................199 ESP library......................................................................................................................199 ESP.deepSleep..........................................................................................................199 ESP.eraseConfig........................................................................................................200 ESP.getBootMode......................................................................................................200 ESP.getBootVersion...................................................................................................200 ESP.getChipId............................................................................................................200 ESP.getCpuFreqMHz.................................................................................................200 ESP.getCycleCount....................................................................................................200 Page 7 ESP.getFlashChipId...................................................................................................200 ESP.getFlashChipMode.............................................................................................200 ESP.getFlashChipRealSize........................................................................................200 ESP.getFlashChipSize...............................................................................................200 ESP.getFlashChipSizeByChipId.................................................................................200 ESP.getFlashChipSpeed............................................................................................201 ESP.getFreeHeap.......................................................................................................201 ESP.getFreeSketchSpace..........................................................................................201 ESP.getResetInfo.......................................................................................................201 ESP.getResetInfoPtr...................................................................................................201 ESP.getSdkVersion....................................................................................................201 ESP.getSketchSize.....................................................................................................201 ESP.getVcc................................................................................................................201 ESP.reset...................................................................................................................201 ESP.restart.................................................................................................................201 ESP.updateSketch......................................................................................................202 ESP.wdtDisable..........................................................................................................202 ESP.wdtEnable...........................................................................................................202 ESP.wdtFeed..............................................................................................................202 String library....................................................................................................................203 Constructor.................................................................................................................203 String.c_str.................................................................................................................203 String.reserve.............................................................................................................203 String.length...............................................................................................................203 String.concat..............................................................................................................203 String.equalsIgnoreCase............................................................................................203 String.startsWith.........................................................................................................203 String.endsWith..........................................................................................................204 String.charAt..............................................................................................................204 String.setCharAt.........................................................................................................204 String.getBytes...........................................................................................................204 String toCharArray.....................................................................................................204 String.indexOf............................................................................................................204 String.lastIndexOf.......................................................................................................204 String.substring..........................................................................................................204 String.replace.............................................................................................................204 String.remove.............................................................................................................204 String.toLowerCase....................................................................................................204 String.toUpperCase....................................................................................................204 String.trim...................................................................................................................205 String.toInt..................................................................................................................205 String.toFloat..............................................................................................................205 Programming with JavaScript..................................................................................................205 Building Espruino-ESP........................................................................................................206 Page 8 Integration with Web Apps.......................................................................................................206 REST Services....................................................................................................................206 REST protocol................................................................................................................206 ESP8266 as a REST client.............................................................................................206 ESP8266 as a REST service provider............................................................................207 DuckDNS............................................................................................................................207 Sample applications.................................................................................................................208 Sample – Light an LED based on the arrival of a UDP datagram........................................209 Sample – Ultrasonic distance measurement........................................................................211 Sample – WiFi Scanner.......................................................................................................213 Sample – Working with micro SD cards...............................................................................214 Sample – Playing audio from an event................................................................................214 Sample Libraries......................................................................................................................214 Function list.........................................................................................................................214 authModeToString...........................................................................................................214 checkError......................................................................................................................214 delayMilliseconds............................................................................................................215 dumpBSSINFO...............................................................................................................215 dumpEspConn................................................................................................................215 dumpRestart...................................................................................................................215 dumpState......................................................................................................................215 errorToString...................................................................................................................215 eventLogger....................................................................................................................216 eventReasonToString......................................................................................................216 flashSizeAndMapToString...............................................................................................216 setAsGpio.......................................................................................................................216 setupBlink.......................................................................................................................216 toHex..............................................................................................................................216 API Reference.........................................................................................................................218 Timer functions....................................................................................................................218 os_timer_arm..................................................................................................................218 os_timer_disarm.............................................................................................................219 os_timer_setfn................................................................................................................219 system_timer_reinit.........................................................................................................220 os_timer_arm_us............................................................................................................220 hw_timer_init...................................................................................................................220 hw_timer_arm.................................................................................................................220 hw_timer_set_func..........................................................................................................220 System Functions................................................................................................................220 system_restore...............................................................................................................220 system_restart................................................................................................................220 system_init_done_cb......................................................................................................220 system_get_chip_id........................................................................................................221 system_get_vdd33..........................................................................................................221 Page 9 system_adc_read...........................................................................................................221 system_deep_sleep........................................................................................................221 system_deep_sleep_set_option......................................................................................221 system_phys_set_rfoption..............................................................................................221 system_phys_set_max_tpw............................................................................................221 system_phys_set_tpw_via_vdd33..................................................................................222 system_set_os_print.......................................................................................................222 system_print_meminfo....................................................................................................222 system_get_free_heap_size...........................................................................................222 system_os_task..............................................................................................................223 system_os_post..............................................................................................................223 system_get_time.............................................................................................................224 system_get_rtc_time.......................................................................................................224 system_rtc_clock_cali_proc............................................................................................225 system_rtc_mem_write...................................................................................................225 system_rtc_mem_read...................................................................................................225 system_uart_swap..........................................................................................................225 system_uart_de_swap....................................................................................................225 system_get_boot_version...............................................................................................225 system_get_userbin_addr...............................................................................................225 system_get_boot_mode..................................................................................................225 system_restart_enhance.................................................................................................226 system_update_cpu_freq................................................................................................226 system_get_cpu_freq.....................................................................................................226 system_get_flash_size_map...........................................................................................226 system_get_rst_info........................................................................................................227 system_get_sdk_version()..............................................................................................227 system_soft_wdt_feed....................................................................................................227 system_soft_wdt_stop....................................................................................................227 system_soft_wdt_restart.................................................................................................228 os_memset.....................................................................................................................228 os_memcmp...................................................................................................................228 os_memcpy....................................................................................................................228 os_malloc.......................................................................................................................229 os_zalloc.........................................................................................................................229 os_free............................................................................................................................229 os_bzero.........................................................................................................................230 os_delay_us....................................................................................................................230 os_printf..........................................................................................................................230 os_install_putc1..............................................................................................................231 os_random......................................................................................................................231 os_get_random...............................................................................................................231 os_strlen.........................................................................................................................231 os_strcat.........................................................................................................................232 Page 10

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Building ESP Arduino apps using the Eclipse IDE156. Reasons to consider using Eclipse over Arduino IDE.
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The-ESP8266-Book-Sep.. PDF

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Page 1 Table of Contents Introduction................................................................................................................................18 Overview....................................................................................................................................19 The ESP8266........................................................................................................................20 Maturity.................................................................................................................................20 The specification...................................................................................................................21 ESP8266 Modules.................................................................................................................22 ESP-12.............................................................................................................................22 ESP-1...............................................................................................................................26 Adafruit HUZZAH..............................................................................................................32 NodeMCU.........................................................................................................................32 node.IT (aka ESP-210).....................................................................................................32 SparkFun WiFi Shield – ESP8266....................................................................................32 Connecting to the ESP8266.......................................................................................................33 WiFi Theory...............................................................................................................................34 AT Command Programming.......................................................................................................36 Commands............................................................................................................................37 Assembling circuits....................................................................................................................42 USB to UART converters.......................................................................................................43 Breadboards..........................................................................................................................44 Power....................................................................................................................................45 Multi-meter / Logic probe / Logic Analyzer.............................................................................45 Sundry components..............................................................................................................46 Physical construction.............................................................................................................46 Recommended setup for programming ESP8266.................................................................46 Configuration for flashing the device.....................................................................................49 Programming.............................................................................................................................50 Boot mode.............................................................................................................................50 The ESP8266 SDK................................................................................................................51 Include directories.............................................................................................................51 Compiling..............................................................................................................................52 Loading a program into the ESP8266...............................................................................59 Programming environments..............................................................................................63 Compilation tools..............................................................................................................63 ar..................................................................................................................................63 esptool.py.....................................................................................................................63 esptool-ck.....................................................................................................................65 gcc...............................................................................................................................67 gen_appbin.py..............................................................................................................68 make............................................................................................................................69 nm................................................................................................................................69 objcopy.........................................................................................................................70 Page 2 objdump.......................................................................................................................70 xxd...............................................................................................................................70 Linking...................................................................................................................................70 Debugging.............................................................................................................................72 Logging to UART1............................................................................................................72 Run a Blinky.....................................................................................................................72 Dumping IP Addresses.....................................................................................................73 Exception handling...........................................................................................................74 Debugging and testing TCP and UDP connections...........................................................75 Android – Socket Protocol............................................................................................75 Android – UDP Sender/Receiver..................................................................................75 Windows – Hercules....................................................................................................76 Curl..............................................................................................................................76 Architecture...........................................................................................................................76 Custom programs.............................................................................................................76 WiFi at startup.......................................................................................................................77 Working with WiFi..................................................................................................................77 Scanning for access points...............................................................................................77 Defining the operating mode.............................................................................................78 Handling WiFi events........................................................................................................79 Station configuration.........................................................................................................80 Connecting to an access point..........................................................................................81 Control and data flows when connecting as a station.......................................................81 Being an access point.......................................................................................................82 The DHCP server.............................................................................................................83 Current IP Address, netmask and gateway.......................................................................84 WiFi Protected Setup – WPS............................................................................................84 Working with TCP/IP.............................................................................................................85 The ESPConn architecture...............................................................................................85 TCP..................................................................................................................................86 Sending and receiving TCP data..................................................................................90 TCP Error handling.......................................................................................................91 UDP..................................................................................................................................92 Broadcast with UDP.....................................................................................................95 Ping request.....................................................................................................................95 Name Service...................................................................................................................95 Multicast Domain Name Systems.....................................................................................96 Working with SNTP...........................................................................................................96 ESP-NOW.............................................................................................................................97 GPIOs...................................................................................................................................98 Expanding the number of available GPIOs.....................................................................104 ESP_PCF8574 library................................................................................................107 Working with I2C.................................................................................................................108 Working with SPI – Serial Peripheral Interface....................................................................110 Page 3 Working with serial...............................................................................................................112 Task handling.......................................................................................................................113 Timers and time...................................................................................................................114 Working with memory..........................................................................................................114 Pulse Width Modulation – PWM..........................................................................................119 Analog to digital conversion.................................................................................................120 Sleep modes.......................................................................................................................122 Watchdog timer...................................................................................................................123 Security...............................................................................................................................124 Mapping from Arduino.........................................................................................................124 Partner TCP/IP APIs................................................................................................................125 Java Sockets.......................................................................................................................126 WebSockets........................................................................................................................129 Programming using Eclipse.....................................................................................................129 Installing the Eclipse Serial terminal....................................................................................132 Programming using the Arduino IDE........................................................................................139 Implications of Arduino IDE support.....................................................................................140 Installing the Arduino IDE with ESP8266 support................................................................141 Tips for working in the Arduino environment........................................................................147 Initialize global classes in setup()....................................................................................147 Invoking Espressif SDK API from a sketch......................................................................147 Exception handling.........................................................................................................148 The SPIFFS file system.......................................................................................................148 The mkspiffs command...................................................................................................148 The architecture of the Arduino IDE support........................................................................149 Building ESP Arduino apps using the Eclipse IDE...............................................................156 Reasons to consider using Eclipse over Arduino IDE.....................................................170 Notes on using the Eclipse Arduino package..................................................................171 Arduino ESP Libraries.........................................................................................................172 The WiFi library...............................................................................................................172 WiFi.begin..................................................................................................................172 WiFi.beingSmartConfig..............................................................................................173 WiFi.beginWPSConfig................................................................................................173 WiFi.BSSID................................................................................................................173 WiFi.BSSIDstr............................................................................................................173 WiFi channel..............................................................................................................173 WiFi.config.................................................................................................................173 WiFi.disconnect..........................................................................................................174 WiFi.encryptionType...................................................................................................174 WiFi.gatewayIP..........................................................................................................174 WiFi.getNetworkInfo...................................................................................................174 WiFi.hostByName......................................................................................................175 WiFi.hostname...........................................................................................................175 WiFi.isHidden.............................................................................................................175 Page 4 WiFi.localIP................................................................................................................175 WiFi.macAddress.......................................................................................................175 WiFi.mode..................................................................................................................175 WiFi.printDiag.............................................................................................................176 WiFi.RSSI...................................................................................................................176 WiFi.scanComplete....................................................................................................176 WiFi.scanDelete.........................................................................................................177 WiFi.scanNetworks.....................................................................................................177 WiFi.smartConfigDone...............................................................................................177 WiFi.softAP................................................................................................................177 WiFi.softAPConfig......................................................................................................178 WiFi.softAPdisconnect...............................................................................................178 WiFi.softAPmacAddress.............................................................................................178 WiFi.softAPIP.............................................................................................................178 WiFi.SSID...................................................................................................................178 WiFi.status.................................................................................................................178 WiFi.stopSmartConfig................................................................................................179 WiFi.subnetMask........................................................................................................179 WiFi.waitForConnectResult........................................................................................179 WiFiClient.......................................................................................................................179 WiFiClient...................................................................................................................179 WiFiClient.available....................................................................................................179 WiFiClient.connect.....................................................................................................180 WiFiClient.connected.................................................................................................180 WiFiClient.flush..........................................................................................................180 WiFiClient.getNoDelay...............................................................................................180 WiFiClient.peek..........................................................................................................180 WiFiClient.read...........................................................................................................180 WiFiClient.remoteIP...................................................................................................180 WiFiClient.remotePort................................................................................................181 WiFiClient.setLocalPortStart......................................................................................181 WiFiClient.setNoDelay...............................................................................................181 WiFiClient.status........................................................................................................181 WiFiClient.stop...........................................................................................................181 WiFiClient.stopAll.......................................................................................................181 WiFiClient.write..........................................................................................................181 WiFiServer......................................................................................................................182 WiFiServer.................................................................................................................182 WiFiServer.available...................................................................................................182 WiFiServer.begin........................................................................................................182 WiFiServer.getNoDelay..............................................................................................182 WiFiServer.hasClient..................................................................................................182 WiFiServer.setNoDelay..............................................................................................182 WiFiServer.status.......................................................................................................182 Page 5 WiFiServer.write.........................................................................................................182 IPAddress.......................................................................................................................183 ESP8266WebServer.......................................................................................................183 ESP8266WebServer..................................................................................................185 ESP8266WebServer.arg............................................................................................186 ESP8266WebServer.argName...................................................................................186 ESP8266WebServer.args..........................................................................................186 ESP8266WebServer.begin.........................................................................................186 ESP8266WebServer.client.........................................................................................186 ESP8266WebServer.handleClient..............................................................................186 ESP8266WebServer.hasArg......................................................................................186 ESP8266WebServer.method......................................................................................187 ESP8266WebServer.on.............................................................................................187 ESP8266WebServer.onFileUpload............................................................................187 ESP8266WebServer.onNotFound..............................................................................187 ESP8266WebServer.send..........................................................................................188 ESP8266WebServer.sendContent.............................................................................188 ESP8266WebServer.sendHeader..............................................................................188 ESP8266WebServer.setContentLength.....................................................................188 ESP8266WebServer.streamFile.................................................................................188 ESP8266WebServer.upload.......................................................................................188 ESP8266WebServer.uri.............................................................................................188 ESP8266mDNS library...................................................................................................189 MDNS.addService......................................................................................................189 MDNS.begin...............................................................................................................189 MDNS.update.............................................................................................................189 I2C – Wire.......................................................................................................................189 Wire.available.............................................................................................................190 Wire.begin..................................................................................................................190 Wire.beginTransmission.............................................................................................191 Wire.endTransmission................................................................................................191 Wire.flush...................................................................................................................191 Wire.onReceive..........................................................................................................191 Wire.onReceiveService..............................................................................................191 Wire.onRequest.........................................................................................................192 Wire.onRequestService..............................................................................................192 Wire.peek...................................................................................................................192 Wire.pins....................................................................................................................192 Wire.read...................................................................................................................192 Wire.requestFrom......................................................................................................193 Wire.setClock.............................................................................................................193 Wire.write...................................................................................................................193 Ticker library...................................................................................................................193 Ticker.........................................................................................................................194 Page 6 attach.........................................................................................................................194 attach_ms..................................................................................................................194 detach........................................................................................................................194 once...........................................................................................................................195 once_ms....................................................................................................................195 EEPROM library.............................................................................................................195 EEPROM.begin..........................................................................................................195 EEPROM.commit.......................................................................................................195 EEPROM.end.............................................................................................................195 EEPROM.get..............................................................................................................196 EEPROM.getDataPtr..................................................................................................196 EEPROM.put..............................................................................................................196 EEPROM.read...........................................................................................................196 EEPROM.write...........................................................................................................196 SPIFFS...........................................................................................................................196 SPIFFS.begin.............................................................................................................196 SPIFFS.open..............................................................................................................197 SPIFFS.openDir.........................................................................................................197 SPIFFS.remove..........................................................................................................197 SPIFFS.rename.........................................................................................................197 File.available..............................................................................................................197 File.close....................................................................................................................198 File.flush.....................................................................................................................198 File.name...................................................................................................................198 File.peek....................................................................................................................198 File.position................................................................................................................198 File.read.....................................................................................................................198 File.seek.....................................................................................................................198 File.size......................................................................................................................199 File.write.....................................................................................................................199 Dir.fileName................................................................................................................199 Dir.next.......................................................................................................................199 Dir.open......................................................................................................................199 Dir.openDir.................................................................................................................199 Dir.remove..................................................................................................................199 Dir.rename..................................................................................................................199 ESP library......................................................................................................................199 ESP.deepSleep..........................................................................................................199 ESP.eraseConfig........................................................................................................200 ESP.getBootMode......................................................................................................200 ESP.getBootVersion...................................................................................................200 ESP.getChipId............................................................................................................200 ESP.getCpuFreqMHz.................................................................................................200 ESP.getCycleCount....................................................................................................200 Page 7 ESP.getFlashChipId...................................................................................................200 ESP.getFlashChipMode.............................................................................................200 ESP.getFlashChipRealSize........................................................................................200 ESP.getFlashChipSize...............................................................................................200 ESP.getFlashChipSizeByChipId.................................................................................200 ESP.getFlashChipSpeed............................................................................................201 ESP.getFreeHeap.......................................................................................................201 ESP.getFreeSketchSpace..........................................................................................201 ESP.getResetInfo.......................................................................................................201 ESP.getResetInfoPtr...................................................................................................201 ESP.getSdkVersion....................................................................................................201 ESP.getSketchSize.....................................................................................................201 ESP.getVcc................................................................................................................201 ESP.reset...................................................................................................................201 ESP.restart.................................................................................................................201 ESP.updateSketch......................................................................................................202 ESP.wdtDisable..........................................................................................................202 ESP.wdtEnable...........................................................................................................202 ESP.wdtFeed..............................................................................................................202 String library....................................................................................................................203 Constructor.................................................................................................................203 String.c_str.................................................................................................................203 String.reserve.............................................................................................................203 String.length...............................................................................................................203 String.concat..............................................................................................................203 String.equalsIgnoreCase............................................................................................203 String.startsWith.........................................................................................................203 String.endsWith..........................................................................................................204 String.charAt..............................................................................................................204 String.setCharAt.........................................................................................................204 String.getBytes...........................................................................................................204 String toCharArray.....................................................................................................204 String.indexOf............................................................................................................204 String.lastIndexOf.......................................................................................................204 String.substring..........................................................................................................204 String.replace.............................................................................................................204 String.remove.............................................................................................................204 String.toLowerCase....................................................................................................204 String.toUpperCase....................................................................................................204 String.trim...................................................................................................................205 String.toInt..................................................................................................................205 String.toFloat..............................................................................................................205 Programming with JavaScript..................................................................................................205 Building Espruino-ESP........................................................................................................206 Page 8 Integration with Web Apps.......................................................................................................206 REST Services....................................................................................................................206 REST protocol................................................................................................................206 ESP8266 as a REST client.............................................................................................206 ESP8266 as a REST service provider............................................................................207 DuckDNS............................................................................................................................207 Sample applications.................................................................................................................208 Sample – Light an LED based on the arrival of a UDP datagram........................................209 Sample – Ultrasonic distance measurement........................................................................211 Sample – WiFi Scanner.......................................................................................................213 Sample – Working with micro SD cards...............................................................................214 Sample – Playing audio from an event................................................................................214 Sample Libraries......................................................................................................................214 Function list.........................................................................................................................214 authModeToString...........................................................................................................214 checkError......................................................................................................................214 delayMilliseconds............................................................................................................215 dumpBSSINFO...............................................................................................................215 dumpEspConn................................................................................................................215 dumpRestart...................................................................................................................215 dumpState......................................................................................................................215 errorToString...................................................................................................................215 eventLogger....................................................................................................................216 eventReasonToString......................................................................................................216 flashSizeAndMapToString...............................................................................................216 setAsGpio.......................................................................................................................216 setupBlink.......................................................................................................................216 toHex..............................................................................................................................216 API Reference.........................................................................................................................218 Timer functions....................................................................................................................218 os_timer_arm..................................................................................................................218 os_timer_disarm.............................................................................................................219 os_timer_setfn................................................................................................................219 system_timer_reinit.........................................................................................................220 os_timer_arm_us............................................................................................................220 hw_timer_init...................................................................................................................220 hw_timer_arm.................................................................................................................220 hw_timer_set_func..........................................................................................................220 System Functions................................................................................................................220 system_restore...............................................................................................................220 system_restart................................................................................................................220 system_init_done_cb......................................................................................................220 system_get_chip_id........................................................................................................221 system_get_vdd33..........................................................................................................221 Page 9 system_adc_read...........................................................................................................221 system_deep_sleep........................................................................................................221 system_deep_sleep_set_option......................................................................................221 system_phys_set_rfoption..............................................................................................221 system_phys_set_max_tpw............................................................................................221 system_phys_set_tpw_via_vdd33..................................................................................222 system_set_os_print.......................................................................................................222 system_print_meminfo....................................................................................................222 system_get_free_heap_size...........................................................................................222 system_os_task..............................................................................................................223 system_os_post..............................................................................................................223 system_get_time.............................................................................................................224 system_get_rtc_time.......................................................................................................224 system_rtc_clock_cali_proc............................................................................................225 system_rtc_mem_write...................................................................................................225 system_rtc_mem_read...................................................................................................225 system_uart_swap..........................................................................................................225 system_uart_de_swap....................................................................................................225 system_get_boot_version...............................................................................................225 system_get_userbin_addr...............................................................................................225 system_get_boot_mode..................................................................................................225 system_restart_enhance.................................................................................................226 system_update_cpu_freq................................................................................................226 system_get_cpu_freq.....................................................................................................226 system_get_flash_size_map...........................................................................................226 system_get_rst_info........................................................................................................227 system_get_sdk_version()..............................................................................................227 system_soft_wdt_feed....................................................................................................227 system_soft_wdt_stop....................................................................................................227 system_soft_wdt_restart.................................................................................................228 os_memset.....................................................................................................................228 os_memcmp...................................................................................................................228 os_memcpy....................................................................................................................228 os_malloc.......................................................................................................................229 os_zalloc.........................................................................................................................229 os_free............................................................................................................................229 os_bzero.........................................................................................................................230 os_delay_us....................................................................................................................230 os_printf..........................................................................................................................230 os_install_putc1..............................................................................................................231 os_random......................................................................................................................231 os_get_random...............................................................................................................231 os_strlen.........................................................................................................................231 os_strcat.........................................................................................................................232 Page 10

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Building ESP Arduino apps using the Eclipse IDE156. Reasons to consider using Eclipse over Arduino IDE.
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