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Restore S300 frame parsing for prefix frames

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This commit is contained in:
HVBT Dev 2026-07-28 01:29:12 +05:30
parent 5df3442523
commit 80167fd9e5
3 changed files with 4 additions and 9 deletions
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8
lib/core/protocol/s300_parser.dart
View File

@ -6,11 +6,9 @@ import 'neg8.dart';
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. Keep this check near the
// parser so Bluetooth diagnostics can still receive and count raw frames.
// Diagnostic signature observed in the S300 Bluetooth stream. Do not use
// this to drop frames globally; current captures show real changing data can
// still be carried in frames with this prefix.
return frame[0] == 0x1B &&
frame[1] == 0x00 &&
frame[2] == 0x14 &&

3
lib/core/providers/sensor_provider.dart
View File

@ -15,9 +15,6 @@ final sensorStateProvider = StreamProvider<SensorState>((ref) async* {
await for (final frame in btNotifier.frameStream) {
if (ecuType == EcuType.s300) {
if (isS300PlaceholderFrame(frame)) {
continue;
}
yield parseS300(frame, validateChecksum: false);
} else {
yield parseKPro(frame);

2
test/s300_parser_test.dart
View File

@ -161,7 +161,7 @@ void main() {
expect(state.rpm, equals(1000.0));
});
test('detects known S300 placeholder frame', () {
test('detects known S300 prefix signature', () {
final frame = Uint8List(128);
final signature = [
0x1B,