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I would like to connect to my headset and send it an ACL command to make it ring.
However, so far I only found a method to connect via RFCOMM to a Bluetooth Device. Is that the only way or is it possible to send an ACL command as well?
Thanks!
You are confused about the protocols. ACL is a low-level transport protocol used by BT devices to send data. It has nothing to do with application specific meanings of the data. Above ACL links is a protocol called L2CAP, which is still essentially a data pipe. Above L2CAP you get into application specific protocols like RFCOMM. Rather than RFCOMM, Headset Profile (HSP) is used to do things like ringing a phone.
http://en.wikipedia.org/wiki/Bluetooth_profile#Headset_Profile_.28HSP.29