Add experimental AirPods heart-rate monitoring - #702
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…epods-org#702) hr.rs = a faithful Rust port of RtBuddyHeartRateDecoder (frame reassembly across chunks + a bounded protobuf/varint parser + the full HEARTRATE validation: log types {1,3}, service 19, 18-byte payload, known status tail @15, BPM @offset 1 in 30..=220). aap.rs gets the enable sequence (AACP 1.3 CONNECT/CAPABILITIES init + HRM_STATE 0x30 + the RTBuddy START/STOP frames). IPC gains Snapshot.heart_rate + Command::SetHeartRate{on}. run_receiver feeds each recv chunk to the decoder only when HR is on (opt-in, off by default — it drains battery), publishes new BPM via push_state, and re-arms/clears across reconnects. Pro 3 only; experimental — needs on-hardware verification of the init timing + the stop path. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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…epods-org#702) The RTBuddy stream almost never starts on the first enable (frame_prefix_hits=0 on hardware). Mirror the Android HeartRateMonitor: on SetHeartRate{on}, a dedicated retry thread runs a 15s campaign — each attempt STOP-resets + re-sends the init frames + HRM_STATE + START, then polls hr_got_sample for 8s; on the first decoded BPM it goes live (run_receiver keeps decoding), else it backs off (500/1000/2000ms) and retries until the window is spent. hr_got_sample is the run_receiver<->retry rendezvous; hr_retrying guards against stacking two campaigns. No L2CAP reconnect (service-level re-enable only). Reconnect re-arm goes through the same path. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Captured from a real iOS Fitness/Strava HR session via PacketLogger: at workout start the iPhone sends 04 00 04 00 44 00 04 00 02 00 03 07 (opcode 0x44, value 0x07) alongside the SensorDataWX frames — a command LibrePods never mapped. The PR librepods-org#702 enable (HRM_STATE + START) only yields empty status heartbeats; this is the suspected 'enter workout sampling mode' trigger. Sent right before START, mirroring the iPhone ordering. Experimental — validating on hardware.
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Adds an experimental Heart-rate test under Settings. It initializes the RTBuddy HEARTRATE stream and shows structurally validated samples in a live graph based on the protocol work in https://github.com/tomppi/airpods_rtbuddy_v37_probe. I also fixed a compatibility issue found during testing.
Tested with AirPods Pro 3 on a OnePlus 15