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Filter S300 placeholder frames

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This commit is contained in:
HVBT Dev 2026-07-28 01:08:17 +05:30
parent 74476afc45
commit 2b537728dc
1 changed files with 33 additions and 0 deletions
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33
lib/core/bluetooth/bt_poller.dart
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@ -87,6 +87,12 @@ class BtPoller {
final Uint8List frame =
Uint8List.fromList(_rxBuf.sublist(startIdx, startIdx + 128));
if (ecuType == EcuType.s300 && _isS300PlaceholderFrame(frame)) {
droppedFrames++;
_rxBuf.removeRange(0, startIdx + 128);
continue;
}
final checksumOk = validateFrame(frame);
final canUseFrame = checksumOk || ecuType == EcuType.s300;
@ -119,4 +125,31 @@ class BtPoller {
stop();
_frameController.close();
}
bool _isS300PlaceholderFrame(Uint8List frame) {
if (frame.length != 128) return false;
// The S300 Bluetooth stream can interleave a valid-checksum placeholder
// frame that is not the SManager live sensor frame. It has a fixed header
// and zero/overflow values for speed, TPS, injection and ignition, then it
// overwrites the dashboard with stale/empty values. Filter only this exact
// signature so true idle/stopped live frames can still pass.
return frame[0] == 0x1B &&
frame[1] == 0x00 &&
frame[2] == 0x14 &&
frame[3] == 0x00 &&
frame[4] == 0x00 &&
frame[5] == 0xFF &&
frame[6] == 0xFF &&
frame[7] == 0xF2 &&
frame[8] == 0x03 &&
frame[9] == 0x18 &&
frame[10] == 0x00 &&
frame[11] == 0x00 &&
frame[12] == 0x10 &&
frame[13] == 0x00 &&
frame[14] == 0x00 &&
frame[15] == 0x00 &&
frame[16] == 0xC4;
}
}