switchUnit method
切换单位 unit 0: °C, 1: °F 使用UUID(elinkWriteUuid: FFE1)的特征值写入 Write using the characteristic value of UUID(elinkWriteUuid: FFE1)
Implementation
Future<List<int>> switchUnit(int unit) {
if (_mac == null) return Future.value([]);
final payload = [0x04, unit];
return getElinkA7Data(payload);
}