doc/hfp-overview.txt

   1 HandsFree Profile Audio Gateway diagram
   2 =======================================
   3
   4 This diagram explains how oFono manages HFP AG.
   5
   6 AT commands and unsolicited results are managed in their related atom (eg. ATA
   7 is managed in voicecall atom).
   8 The emulator atom is managing AT commands or unsolicited results that are not
   9 falling into a specific atom.
  10
  11 1) HFP AG plugin registers a HFP AG server as soon as a voicecall atom exist.
  12 2) When a connection occurs on this server, HFP AG plugin creates and registers
  13    an emulator atom.
  14 3) Emulator atom will start a GAtServer and registers non-atom-specific
  15    AT commands to it.
  16 4) On emulator atom registration, voice call related atoms (voicecall, network
  17    and sim) register AT callbacks they managed through emulator atom.
  18
  19
  20 *===========*                *-----------------*
  21 |           |   Register     |                 |
  22 |   BlueZ   |<---------------|  HFP AG plugin  |
  23 |           |   SDP record   |                 |
  24 *===========*                *-----------------*
  25                                       |
  26                                       | Start emulator on connection
  27                                       |
  28                                       V
  29                              *-----------------*
  30                              |                 |
  31                    *-------->|  Emulator Atom  |
  32                    |         |                 |
  33                    |         *-----------------*
  34                    |                  |
  35          Register  |                  | Register AT commands
  36             AT     |                  V
  37          callbacks |         *-----------------*
  38                    |         |                 |
  39                    |         |    GAtServer    |
  40                    |         |                 |
  41                    |         *-----------------*
  42                    |
  43                    *---------------------*-------------------*
  44                    |                     |                   |
  45           *----------------*     *--------------*     *-------------*
  46           |                |     |              |     |             |
  47           | Voicecall atom |     | Network atom |     |  SIM atom   |
  48           |                |     |              |     |             |
  49           *----------------*     *--------------*     *-------------*