Simple machine-to-machine communication
In the first project of this chapter, we are going to see a very simple case of M2M communication, where one ESP8266 Wi-Fi chip will send a trigger signal to another chip (via the cloud, of course), that will in response toggle the state of an LED. For the trigger, we'll use a simple push button connected to the first ESP8266.
Let's first assemble the hardware for this project. For the LED board, the hardware configuration is really easy: simply place the resistor in series with the LED, just as we already did in earlier chapters. Then, connect the resistor to pin 5 of the ESP8266, and the other pin to the ground.
This is the final result for the LED board:
For the board that will host the push button, first ...
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