Basic android app to turn on and off the ESP8266-01 Wifi module GPIO2 pin.
At the ESP side using the Nodemcu example from the github with little modification.
(changed to station mode from ap mode, and removed the html lines, because not need for the app.)
NodeMCU link:
https://github.com/nodemcu/nodemcu-firmware/blob/master/lua_examples/webap_toggle_pin.lua
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Post time: Sep-03-2017