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doc: add hfp-overview.txt
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HandsFree Profile Audio Gateway diagram
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=======================================
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This diagram explains how oFono manages HFP AG.
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AT commands and unsolicited results are managed in their related atom (eg. ATA
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is managed in voicecall atom).
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The emulator atom is managing AT commands or unsolicited results that are not
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falling into a specific atom.
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1) HFP AG plugin registers a HFP AG server as soon as a voicecall atom exist.
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2) When a connection occurs on this server, HFP AG plugin creates and registers
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an emulator atom.
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3) Emulator atom will start a GAtServer and registers non-atom-specific
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AT commands to it.
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4) On emulator atom registration, voice call related atoms (voicecall, network
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and sim) register AT callbacks they managed through emulator atom.
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*===========* *-----------------*
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| | Register | |
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| BlueZ |<---------------| HFP AG plugin |
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| | SDP record | |
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*===========* *-----------------*
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| Start emulator on connection
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V
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*-----------------*
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*-------->| Emulator Atom |
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| *-----------------*
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Register | | Register AT commands
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AT | V
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callbacks | *-----------------*
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| | GAtServer |
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| *-----------------*
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*---------------------*-------------------*
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*----------------* *--------------* *-------------*
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| Voicecall atom | | Network atom | | SIM atom |
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*----------------* *--------------* *-------------*
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