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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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commit 7627e142e1
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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
@ -412,4 +445,5 @@ BTstack only provides an ATT Server, while the GATT Server logic is
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.
compiler creates a list of defines in the generated \*.h file.