interface the ring with my android phone.
In what way? Serial, or Hands-free, or A2DP, or something else?
There is a bluetooth module inside one of the earpieces in these http://www.plantronics.com/us/product/backbeat-go
so they get quite small (see pic).
Well, I just want to send some characters at the press of a button from the ring to the phone, just to do some simple stuff like turn on music or change songs etc. Now my problem is that I am stuck with these big bluetooth modules, which are easy to program via AT commands, but I can not fit them in the ring.
The picture you just shared, which chip is the bluetooth on that - left or right?
Can you give me some idea as to how can the bluetooth be programmed, if not for the AT commands?