tree 14fc2dab4fe768ed60aea23115fc127a480d06ab
parent ba5f5d77972637b250d9b1e8b14c520cd46da2a3
author Ani Ramakrishnan <aniramakri@google.com> 1788559183 +0000
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1791318522 -0700

rust/bt-mcs: Add public methods for updating server state

Add high-level public methods on McsServer to update track metadata,
media playback state, position, identity, and optional control
characteristics.

Issue GATT notifications for state updates according to MCS v1.0.1:
 - Order Track Changed notification after track property updates
 - Resolve FromEnd track position offsets into non-negative values
 - Notify TrackPosition as Unavailable on transition to Inactive
 - Treat redundant Media State transitions as no-ops
 - Reject write notifications when state validation fails

Update track position calculation to factor in playback speed and
seeking speed without integer overflow.

Add FakeServerEventsExt assertion helpers in bt-gatt test_utils and
update the MCS server test suite to explicitly assert GATT handles
and notification payloads.

Bug: 540400364
Test: cargo test -p bt-gatt -p bt-mcs, ./presubmit.sh
Change-Id: Ib0d9e20de601d19bce339e332d5256a3f998eb10
Reviewed-on: https://bluetooth-review.googlesource.com/c/bluetooth/+/3900