regard to All,
Before researching source and spec, I'd better studying Network Protocol Layer and it's function.
As to RFCOMM, frankly speaking I don't know Communicate-Emulation. What is it?
Spec document saying,,, " RFCOMM protocol provides emulation of serial ports over L2CAP protocol and it is based on the ETSI standard TS 07.10."
Let me study port-emulation and TS 07.10 basically.
Please, hand over Document, Reference.
To : email@example.com
Have a nice day, always healthy.