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Code Releases Wiki Activity

Xiaomi-protobuf: Fix RR parsing

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Thanks to nic8 on matrix for the fix.
This commit is contained in:
José Rebelo 2024-12-03 21:52:37 +00:00
parent 69847c19ff
commit 32109507d9
1 changed files with 27 additions and 5 deletions
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32
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/activity/impl/SleepDetailsParser.java
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@ -78,6 +78,19 @@ public class SleepDetailsParser extends XiaomiActivityParser {
sleepQuality = buf.get() & 0xff;
}
// note on RR-intervals (msg type 1) on Xiaomi band 9, FW 2.3.93, HW M2345B1:
//
// the band collects RR interval in groups of ~10 minutes, which are then sent as msg type 1
// along with an associated RTC timestamp. RTC timestamp jitter and drift of up to
// +/-several seconds was observed, compared to the sum of intervals in a given msg.
//
// In order to preserve RR-interval continuity throughout the entire duration of sleep, as
// is necessary for breath-detection algorithm, and to avoid negative or impossibly large
// (false) RR intervals, we maintain an running timestamp of last heart pulse.
// While processing msgs, in case the detected jitter is too large, the running timestamp
// is reset to the current msg timestamp.
long lastHeartPulseTimestamp = 0; // tracks the true timestamp of last heart pulse across the jittery 10-minute segments
LOG.debug("Sleep sample: bedTime: {}, wakeupTime: {}, isAwake: {}", bedTime, wakeupTime, isAwake);
final List<XiaomiSleepTimeSample> summaries = new ArrayList<>();
@ -185,13 +198,22 @@ public class SleepDetailsParser extends XiaomiActivityParser {
final ByteBuffer dataBuf = ByteBuffer.wrap(data).order(ByteOrder.BIG_ENDIAN);
if (type == 1) {
long timestampAcc = ts;
while (dataBuf.position() < dataBuf.limit()) {
final int delta = dataBuf.get() & 0xff;
// RR intervals: https://en.wikipedia.org/wiki/RR_interval
// add first heartbeat before intervals, if necessary
if (Math.abs(lastHeartPulseTimestamp - ts) > 30000) { // 30 seconds
// we drifted too far from RTC timestamp, or this is the very first sample:
lastHeartPulseTimestamp = ts; // resync
final HeartPulseSample heartPulseSample = new HeartPulseSample();
heartPulseSample.setTimestamp(timestampAcc + delta);
heartPulseSample.setTimestamp(lastHeartPulseTimestamp);
heartPulseSamples.add(heartPulseSample);
}
// add heartbeats after intervals
while (dataBuf.position() < dataBuf.limit()) {
final int delta = dataBuf.get() & 0xff; // delta is in 10msec units
lastHeartPulseTimestamp += 10 * delta; // convert to 1msec units for timestamps
final HeartPulseSample heartPulseSample = new HeartPulseSample();
heartPulseSample.setTimestamp(lastHeartPulseTimestamp);
heartPulseSamples.add(heartPulseSample);
timestampAcc += delta;
}
} else if (type == 16) {
final int data_0 = dataBuf.get() & 0xFF;