Commit 4758db0

@@ -0,0 +1,23 @@
+import 'ble_measurement_status.dart';
+
+class BleMeasurementData {
+  BleMeasurementData({
+    required this.systolic,
+    required this.diastolic,
+    required this.meanArterialPressure,
+    required this.isMMHG,
+    required this.pulseRate,
+    required this.userID,
+    required this.status,
+    required this.timestamp,
+  });
+
+  final double systolic;
+  final double diastolic;
+  final double meanArterialPressure;
+  final bool isMMHG; // mmhg or kpa
+  final double? pulseRate;
+  final int? userID;
+  final BleMeasurementStatus status;
+  final DateTime? timestamp;
+}

@@ -0,0 +1,21 @@
+
+class BleMeasurementStatus {
+  BleMeasurementStatus({
+    required this.bodyMovementDetected,
+    required this.cuffTooLose,
+    required this.irregularPulseDetected,
+    required this.pulseRateInRange,
+    required this.pulseRateExceedsUpperLimit,
+    required this.pulseRateIsLessThenLowerLimit,
+    required this.improperMeasurementPosition,
+  });
+
+
+  final bool bodyMovementDetected;
+  final bool cuffTooLose;
+  final bool irregularPulseDetected;
+  final bool pulseRateInRange;
+  final bool pulseRateExceedsUpperLimit;
+  final bool pulseRateIsLessThenLowerLimit;
+  final bool improperMeasurementPosition;
+}

@@ -1,6 +1,7 @@
 /// Blood pressure measurement according to default GATT.
 ///
 /// https://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v4.x.x/doc/html/structble__bps__meas__s.html
+/// https://github.com/NordicSemiconductor/Kotlin-BLE-Library/blob/6b565e59de21dfa53ef80ff8351ac4a4550e8d58/profile/src/main/java/no/nordicsemi/android/kotlin/ble/profile/bps/BloodPressureMeasurementParser.kt
 class MeasurementCharacteristic {
   /// Create a blood pressure measurement with default GATT fields.
   const MeasurementCharacteristic({

@@ -1,3 +1,7 @@
+import 'dart:math';
+
+import 'package:blood_pressure_app/bluetooth/characteristics/ble_measurement_data.dart';
+import 'package:blood_pressure_app/logging.dart';
 import 'package:blood_pressure_app/model/blood_pressure/record.dart';
 
 /// Decoder for blood pressure values.
@@ -9,4 +13,47 @@ class CharacteristicDecoder {
     print(data);
     return BloodPressureRecord(DateTime.now(), data[1], data[3], data[14], '');
   }
+
+  static BleMeasurementData? decodeMeasurementV2(List<int> data) {
+    // https://github.com/NordicSemiconductor/Kotlin-BLE-Library/blob/6b565e59de21dfa53ef80ff8351ac4a4550e8d58/profile/src/main/java/no/nordicsemi/android/kotlin/ble/profile/bps/BloodPressureMeasurementParser.kt
+
+    // Reading specific bits: `(byte & (1 < bitIdx))`
+
+    if (data.length < 7) {
+      Log.trace('BleMeasurementData decodeMeasurement: Not enough data, $data has less than 7 bytes.');
+      return null;
+    }
+
+    int offset = 0;
+
+    final int flagsByte = data[offset];
+    offset += 1;
+
+    final bool isMMHG = ((flagsByte & (1 << 0)) == 0);
+    final bool timestampPresent = ((flagsByte & (1 << 1)) == 0);
+    final bool pulseRatePresent = ((flagsByte & (1 << 2)) == 0);
+    final bool userIdPresent = ((flagsByte & (1 << 3)) == 0);
+    final bool measurementStatusPresent = ((flagsByte & (1 << 4)) == 0);
+
+    if (data.length < (7
+        + (timestampPresent ? 7 : 0)
+        + (pulseRatePresent ? 2 : 0)
+        + (userIdPresent ? 1 : 0)
+        + (measurementStatusPresent ? 2 : 0)
+    )) {
+      Log.trace("BleMeasurementData decodeMeasurement: Flags don't match, $data has less bytes than expected.");
+      return null;
+    }
+
+    final double systolic = _readSFloat(data, offset)!; //TODO
+  }
+}
+
+/// Attempts to read an IEEE-11073 16bit SFloat starting at data[offset].
+double? _readSFloat(List<int> data, int offset) {
+  if (data.length < offset + 2) return null;
+  // TODO: special values (NaN, Infinity)
+  final mantissa = data[offset] + ((data[offset + 1] & 0x0F) << 8); // TODO: https://github.com/NordicSemiconductor/Kotlin-BLE-Library/blob/6b565e59de21dfa53ef80ff8351ac4a4550e8d58/core/src/main/java/no/nordicsemi/android/kotlin/ble/core/data/util/DataByteArray.kt#L392
+  final exponent = data[offset + 1] >> 4;
+  return (mantissa * (pow(10, exponent))).toDouble();
 }

@@ -55,17 +55,14 @@ class DeviceScanCubit extends Cubit<DeviceScanState> {
 
   Future<void> _startScanning() async {
     _scanResultsSubscription = _flutterBluePlus.scanResults
-        .listen(_onScanResult,
-      onError: _onScanError,
+      .listen(_onScanResult,
+        onError: _onScanError,
     );
     try {
       await _flutterBluePlus.startScan(
         // no timeout, the user knows best how long scanning is needed
         withServices: [service],
         // Not all devices are found using this configuration (https://pub.dev/packages/flutter_blue_plus#scanning-does-not-find-my-device).
-        // As long as no significant issues arise from this these devices are
-        // considered unsupported.
-        androidUsesFineLocation: true,
       );
     } catch (e) {
       _onScanError(e);