[bluez/bluez] 7784f3: shared/hfp: Add HF SLC connection function

[bluez/bluez] 7784f3: shared/hfp: Add HF SLC connection function

[fdanis-oss]

  Branch: refs/heads/993065
  Home:   https://github.com/bluez/bluez
  Commit: 7784f3a2330691d887775b8f8066f06aed33e184
      https://github.com/bluez/bluez/commit/7784f3a2330691d887775b8f8066f06aed33e184
  Author: Frédéric Danis <frederic.danis@collabora.com>
  Date:   2025-08-19 (Tue, 19 Aug 2025)

  Changed paths:
    M src/shared/hfp.c
    M src/shared/hfp.h

  Log Message:
  -----------
  shared/hfp: Add HF SLC connection function

This implements the minimal SLC connection exchange, i.e. AT+BRSF,
AT+CIND=?, AT+CIND? and AT+CMER=3,0,0,1 requested to complete the
Service Level Connection Establishment.


  Commit: f6b7ba9862463c36035398d2a7093bfd63743c2c
      https://github.com/bluez/bluez/commit/f6b7ba9862463c36035398d2a7093bfd63743c2c
  Author: Frédéric Danis <frederic.danis@collabora.com>
  Date:   2025-08-19 (Tue, 19 Aug 2025)

  Changed paths:
    M unit/test-hfp.c

  Log Message:
  -----------
  unit/test-hfp: Add SLC connection test

This adds minimal packet exchange to test the SLC establishment.


  Commit: 85d1ebcb539e4d55313caa393dd05cf8986a3b59
      https://github.com/bluez/bluez/commit/85d1ebcb539e4d55313caa393dd05cf8986a3b59
  Author: Frédéric Danis <frederic.danis@collabora.com>
  Date:   2025-08-19 (Tue, 19 Aug 2025)

  Changed paths:
    M src/shared/hfp.c

  Log Message:
  -----------
  shared/hfp: Add +CIEV event support

Register +CIEV handler on SLC completion to call the update_indicator
call back on unsolicited events.


  Commit: b779cf81bb82941d709040d93e02b9003ba6a6d2
      https://github.com/bluez/bluez/commit/b779cf81bb82941d709040d93e02b9003ba6a6d2
  Author: Frédéric Danis <frederic.danis@collabora.com>
  Date:   2025-08-19 (Tue, 19 Aug 2025)

  Changed paths:
    M unit/test-hfp.c

  Log Message:
  -----------
  unit/test-hfp: Add indicators tests for HF

This adds the following tests:
- /HFP/HF/TRS/BV-01-C
  Verify that the HF accepts the registration status indication.
- /HFP/HF/PSI/BV-01-C
  Verify that the HF successfully receives the signal strength status of
  the AG.
- /HFP/HF/PSI/BV-02-C
  Verify that the HF successfully receives the roaming status of the AG.
- /HFP/HF/PSI/BV-03-C
  Verify that the HF successfully receives the battery level status of
  the AG.


Compare: https://github.com/bluez/bluez/compare/7784f3a23306%5E...b779cf81bb82

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