RFCOMM/HFP协议

RFCOMM

Set Asynchronous Balanced Mode (SABM) command  向对方请求建立异步平衡模式（ABM）的建立

Unnumbered Acknowledgement (UA) response  对SABM或者DISC的响应帧，表示确认收到

Disconnected Mode (DM) response，disconnect mode下做出的响应

Disconnect (DISC) command

Unnumbered information with header check (UIH) command and response

 

RFComm 帧格式

 

 

HFP

Audio Gateway (AG) – This is the device that is the gateway of the audio, both for

input and output. Typical devices acting as Audio Gateways are cellular phones.

Hands-Free unit (HF) – This is the device acting as the Audio Gateway‘s remote audio

input and output mechanism. It also provides some remote control means.

These terms are used in the rest of this document to designate these roles

 

 

 

AT+CMER      enables the Signal strength Indication‖ function in the AG.

AT+BIA   allows the HF to deactivate/reactivate individual indicators.

HF shall send AT+COPS=3,0 command to set name format to long alphanumeric