rn-42

I had one around, (exactly this: https://www.sparkfun.com/products/12574) and tried interfacing. It's been pretty easy, I just connected pin 11 to 3.3v, pin 12 to GND, pin 13 to A2 and pin 14 to A3 and that was it.

s = Serial2;
s.setup(115200, { parity:'none', bytesize:8, stopbits:1 });
s.onData(function(d) {
	var data = d.data;
	print(d.data);
});

With this code I can echo stuff written to the corresponding serial port on the pc.