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  • Well, there's a but of info on the HM-10 itself here:

    And the circuit is below. As you say, A2/A3 are RX/TX, but also Pin 23 (which it seems you need for config) is on pin A4, so you can toggle it in software.

    I haven't used one, but it looks like they're AT command-set. You might find that the AT module is quite useful - there's no page on it, but there are some comments in the code, and you could look at the ESP8266 module for some examples of its use.

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    • Screenshot from 2015-06-25 08:44:31.png

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