Ok!! So here’s what I tried.
By connecting only Vcc (3v) and GND to the BTM, I can see a serial adaptor on my android phone. I can’t pair (obviously coz I haven’t connected anything else)
When I connected Vcc, GND, D+ and D- with a USB cable and plugged it into my computer, (I have Fedora Linux), nothing happened. lsusb didn’t show up anything. I can’t remember if it showed up on my phone. Note that Vcc was 5v now (which is USB standard)
Thankfully connecting 5v didn’t blow up the IC. I can still spot it on my android phone after the previous experiment.
So why the hell are there USB D+ and D- pins on this thing?