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add hfp/hsp intro

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Milanka Ringwald 2016-03-09 15:30:16 +01:00
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docs/manual/docs/profiles.md
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@ -248,6 +248,39 @@ calling *sdp_register_service_internal*. BTstack provides the
empty buffer of approximately 200 bytes, a description, and a security
description.
## HSP - Headset Profile
The HSP profile defines how a Bluetooth-enabled headset should communicate
with another Bluetooth enabled device. It relies on SCO for audio encoded
in 64 kbit/s CVSD and a subset of AT commands from GSM 07.07 for
minimal controls including the ability to ring, answer a call, hang up and adjust the volume.
The HSP defines two roles:
- Audio Gateway (AG) - a device that acts as the gateway of the audio, typically a mobile phone or PC.
- Headset (HS) - a device that acts as the AG's remote audio input and output control.
There are following restrictions:
- The CVSD is used for audio transmission.
- Between headset and audio gateway, only one audio connection at a time is supported.
- The profile offers only basic interoperability – for example, handling of multiple calls at the audio gateway is not included.
- The only assumption on the headset’s user interface is the possibility to detect a user initiated action (e.g. pressing a button).
%TODO: audio paths
## HFP - Hands-Free Profile
The HFP profile defines how a Bluetooth-enabled device, e.g. a car kit or a headset, can be used to place and receive calls via a audio gateway device, typically a mobile phone.
It relies on SCO for audio encoded in 64 kbit/s CVSD and a bigger subset of AT commands from GSM 07.07 then HSP for
controls including the ability to ring, to place and receive calls, join a conference call, to answer, hold or reject a call, and adjust the volume.
The HFP defines two roles:
- Audio Gateway (AG) – a device that acts as the gateway of the audio,, typically a mobile phone.
- Hands-Free Unit (HF) – a device that acts as the AG's remote audio input and output control.
%TODO: audio paths
## GAP LE - Generic Access Profile for Low Energy
@ -413,3 +446,4 @@ mainly provided by the GATT compiler. While GATT identifies
Characteristics by UUIDs, ATT uses Handles (16 bit values). To allow to
identify a Characteristic without hard-coding the attribute ID, the GATT
compiler creates a list of defines in the generated \*.h file.