GPX ride recording including heart rate #20

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opened 2026-08-31 17:14:41 +02:00 by robert · 0 comments

robert commented

2026-08-31 17:14:41 +02:00

(Migrated from git.butzei.de)

Goal

Record the ride so it can be exported and re-imported into komoot or Strava.

Acceptance criteria

Track points written incrementally, so a crash loses at most a few seconds
Heart rate from HR_BPM embedded using the standard Garmin TrackPointExtension namespace
Elevation included where available
Paused segments handled sensibly (separate track segments)
Resulting file validates and re-imports into komoot cleanly

Files

companion/.../ride/GpxRecorder.kt

Update — 2026-09-01: heart rate arrives batched, and gaps stay gaps

Heart rate now reaches the phone as a batched HR_SAMPLES message every 5 s, with a watch-side
buffer that survives a Bluetooth dropout (#66, D31).

Decode batched samples using their base_timestamp, not arrival time — a drained backlog is
minutes old and must land at the right point in the track
Dropout gaps written as gaps, never interpolated
Backlog arriving after the ride has been paused or stopped still lands correctly

## Goal Record the ride so it can be exported and re-imported into komoot or Strava. ## Acceptance criteria - [ ] Track points written incrementally, so a crash loses at most a few seconds - [ ] Heart rate from `HR_BPM` embedded using the standard Garmin TrackPointExtension namespace - [ ] Elevation included where available - [ ] Paused segments handled sensibly (separate track segments) - [ ] Resulting file validates and re-imports into komoot cleanly ## Files - `companion/.../ride/GpxRecorder.kt` ## Update — 2026-09-01: heart rate arrives batched, and gaps stay gaps Heart rate now reaches the phone as a batched `HR_SAMPLES` message every 5 s, with a watch-side buffer that survives a Bluetooth dropout (#66, D31). - [ ] Decode batched samples using their `base_timestamp`, not arrival time — a drained backlog is minutes old and must land at the right point in the track - [ ] **Dropout gaps written as gaps, never interpolated** - [ ] Backlog arriving after the ride has been paused or stopped still lands correctly