Trying to extend the "starter" module

Hi, I'm an inexperienced programmer (this is my first time doing Android programming) and I'm working on a App which can collect data from two MMR at the same time. In order to do some practice I'm trying to extend the "starter" module ( so it can turn on/off the led with a switch on two devices at the same time but I don't know what to change in the code. Can you give me some advices?

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