Provide ESP8266 based itead Sonoff with MQTT and 'Over the Air' or OTA firmware.

Install the ESP8266 development environment from esp8266-dev.

Copy the sonoff code files as follows:

• Create directory esp8266-dev/work and copy directory sonoff and file espupload.php into it
• Replace file Makefile.common in directory esp8266-dev

Install a local web server for OTA and copy directory api in webroot.

Update sonoff/user/user_config.h with your specific Wifi and MQTT parameters.

Compile source with make and flash once to sonoff using cable connection as shown in Peter Scargill's blog with make flash. Do not connect AC power during the flash cable connection.

Compile and upload OTA images to your web server with make clean; make IMAGE=1; make register; make clean; make IMAGE=2; make register.

Note: this software is not compatible with Pete's implementation.

The button on sonoff provides the following features:

• a short press toggles the relay. This will blink the LED twice and sends a MQTT status message like stat/sonoff/POWER on
• three short presses start Wifi smartconfig which allows for SSID and Password configuration using an Android mobile phone with the ESP8266 SmartConfig app. The green LED will blink during the smartconfig period for 100 seconds. The MQTT server still needs to be configured using the user_config.h file
• four short presses start OTA download of firmware. The green LED is lit during the update
• pressing the button for over four seconds resets settings to defaults as defined in user_config.h and reboots sonoff

Sonoff responds to the following MQTT commands:

• the relay can be controlled by cmnd/sonoff/power on, cmns/sonoff/power off or cmnd/sonoff/power toggle. The LED will blink twice and sends a MQTT status message like stat/sonoff/POWER on. The same function can be initiated with cmnd/sonoff/light on
• the MQTT topic can be changed with cmnd/sonoff/topic sonoff1 which reboots sonoff and makes it available for MQTT commands like cmnd/sonoff1/power on
• the OTA firmware location can be made known to sonoff by cmnd/sonoff/otaurl http://sidnas2:80/api/sonoff/user1.bin where sidnas2 is your webserver hosting the firmware. Reset to default with cmnd/sonoff/otaurl 1
• upgrade OTA firmware by cmnd/sonoff/upgrade 1
• show status information by cmnd/sonoff/status 1

Most MQTT commands will result in a status feedback like stat/sonoff/POWER On.

See the code for other features.

To aid in finding the IP address of sonoff the network name will be ESP-<MQTT topic>. So the default name is ESP-sonoff.