infinitime.go

@@ -33,7 +33,6 @@ const (
 	MotionValChar   = "00030002-78fc-48fe-8e23-433b3a1942d0"
 	FirmwareVerChar = "00002a26-0000-1000-8000-00805f9b34fb"
 	CurrentTimeChar = "00002a2b-0000-1000-8000-00805f9b34fb"
-	LocalTimeChar   = "00002a0f-0000-1000-8000-00805f9b34fb"
 	BatteryLvlChar  = "00002a19-0000-1000-8000-00805f9b34fb"
 	HeartRateChar   = "00002a37-0000-1000-8000-00805f9b34fb"
 	FSTransferChar  = "adaf0200-4669-6c65-5472-616e73666572"
@@ -48,7 +47,6 @@ var charNames = map[string]string{
 	MotionValChar:    "Motion Values",
 	FirmwareVerChar:  "Firmware Version",
 	CurrentTimeChar:  "Current Time",
-	LocalTimeChar:    "Local Time",
 	BatteryLvlChar:   "Battery Level",
 	HeartRateChar:    "Heart Rate",
 	FSTransferChar:   "Filesystem Transfer",
@@ -68,7 +66,6 @@ type Device struct {
 	motionValChar   *gatt.GattCharacteristic1
 	fwVersionChar   *gatt.GattCharacteristic1
 	currentTimeChar *gatt.GattCharacteristic1
-	localTimeChar   *gatt.GattCharacteristic1
 	battLevelChar   *gatt.GattCharacteristic1
 	heartRateChar   *gatt.GattCharacteristic1
 	fsVersionChar   *gatt.GattCharacteristic1
@@ -424,8 +421,6 @@ func (i *Device) resolveChars() error {
 			i.fwVersionChar = char
 		case CurrentTimeChar:
 			i.currentTimeChar = char
-		case LocalTimeChar:
-			i.localTimeChar = char
 		case BatteryLvlChar:
 			i.battLevelChar = char
 		case HeartRateChar:
@@ -713,9 +708,7 @@ func (i *Device) WatchMotion(ctx context.Context) (<-chan MotionValues, error) {
 	return out, nil
 }
 
-// SetTime sets the watch's
-// * time using the Current Time Service's current time characteristic
-// * timezone information using the CTS's local time characteristic
+// SetTime sets the watch's time using the Current Time Service
 func (i *Device) SetTime(t time.Time) error {
 	if err := i.checkStatus(i.currentTimeChar, CurrentTimeChar); err != nil {
 		return err
@@ -730,38 +723,7 @@ func (i *Device) SetTime(t time.Time) error {
 	binary.Write(buf, binary.LittleEndian, uint8(t.Weekday()))
 	binary.Write(buf, binary.LittleEndian, uint8((t.Nanosecond()/1000)/1e6*256))
 	binary.Write(buf, binary.LittleEndian, uint8(0b0001))
-	if err := i.currentTimeChar.WriteValue(buf.Bytes(), nil); err != nil {
-		return err
-	}
-
-	if err := i.checkStatus(i.localTimeChar, LocalTimeChar); err != nil {
-		// If the characteristic is unavailable,
-		// fail silently, as many people may be on
-		// older InfiniTime versions. A warning
-		// may be added later.
-		if _, ok := err.(ErrCharNotAvail); ok {
-			return nil
-		} else {
-			return err
-		}
-	}
-	_, offset := t.Zone()
-	dst := 0
-
-	// Local time expects two values: the timezone offset and the dst offset, both
-	// expressed in quarters of an hour.
-	// Timezone offset is to be constant over DST, with dst offset holding the offset != 0
-	// when DST is in effect.
-	// As there is no standard way in go to get the actual dst offset, we assume it to be 1h
-	// when DST is in effect
-	if t.IsDST() {
-		dst = 3600
-		offset -= 3600
-	}
-	bufTz := &bytes.Buffer{}
-	binary.Write(bufTz, binary.LittleEndian, uint8(offset / 3600 * 4))
-	binary.Write(bufTz, binary.LittleEndian, uint8(dst / 3600 * 4))
-	return i.localTimeChar.WriteValue(bufTz.Bytes(), nil)
+	return i.currentTimeChar.WriteValue(buf.Bytes(), nil)
 }
 
 // Notify sends a notification to InfiniTime via