ESP8266 OTA upload. (#7)

Author: rafacouto

espressif/esp8266-arduino-ota/README.md

@@ -0,0 +1,75 @@
+
+# Arduino OTA
+
+## About
+
+OTA (Over the Air) update is the process of loading the firmware to ESP module using Wi-Fi connection rather that a serial port. 
+
+This example is adapted from https://github.com/esp8266/Arduino/blob/master/doc/ota_updates/readme.md
+
+## Execute the example
+
+Change directory to the example and edit src/main.cpp to set the SSID and password of your WiFi network.
+
+    const char* ssid = "WIFI_SSID";                                                                                          
+    const char* password = "WIFI_PASS";  
+
+Compile and upload to your esp8266:
+
+    pio run -e esp8266 -t upload
+
+## Test OTA
+
+Use another example ([blink is good option](https://github.com/platformio/platformio-examples/tree/develop/wiring-blink)) to generate the firmware and upload:
+
+    pio run -e nodemcu -t upload --upload-port IP_ADDRESS
+
+IP address of board is printed on the serial interface (115200 bps):
+
+```
+$ pio device monitor -b 115200
+--- Miniterm on /dev/ttyUSB0  115200,8,N,1 ---
+--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
+Ready
+IP address: 192.168.10.190
+```
+
+This is a demo of OTA uploading:
+
+```
+$ pio run -e nodemcu -t upload --upload-port 192.168.10.190
+
+[Mon Dec 19 21:35:48 2016] Processing nodemcu (platform: espressif8266, board:
+nodemcu, framework: arduino)
+------------------------------------------------------------------------------
+Verbose mode can be enabled via `-v, --verbose` option
+Collected 23 compatible libraries
+Looking for dependencies...
+Project does not have dependencies
+Looking for upload port...
+Use manually specified: 192.168.10.190
+Uploading .pioenvs/nodemcu/firmware.bin
+21:35:49 [DEBUG]: Options: {'esp_ip': '192.168.10.190', 'host_port': 31639,
+'image': '.pioenvs/nodemcu/firmware.bin', 'host_ip': '0.0.0.0', 'auth': '',
+'esp_port': 8266, 'spiffs': False, 'debug': True, 'progress': True}
+21:35:49 [INFO]: Starting on 0.0.0.0:31639
+21:35:49 [INFO]: Upload size: 226272
+21:35:49 [INFO]: Sending invitation to: 192.168.10.190
+21:35:49 [INFO]: Waiting for device...
+Uploading: [============================================================] 100%
+Done...
+
+21:35:53 [INFO]: Waiting for result...
+21:35:53 [INFO]: Result: OK
+===================== [SUCCESS] Took 4.67 seconds ==========================
+
+============================= [SUMMARY] ====================================
+Environment uno          	[SKIP]
+Environment nodemcu      	[SUCCESS]
+Environment teensy31     	[SKIP]
+Environment lpmsp430g2553[SKIP]
+===================== [SUCCESS] Took 4.67 seconds ==========================
+```
+
+
+