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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Well, there's a but of info on the HM-10 itself here: http://www.espruino.com/Bluetooth+BLE
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
ATmodule 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.1 Attachment