Ensure TimeChangeReceiver alarm is scheduled when enabling
datetime_synconconnect and registering TimeChangeReceiver broadcast
receiver.
It is important to re-schedule the alarm after registering broadcast
receiver, because:
1. if broadcast receiver was unregistered while previous alarm arrived,
there is no alarm scheduled;
2. re-scheduling the alarm resets the periodic time sync timer when
first device is connected (which is desired).
It is important to re-schedule the alarm when datetime_synconconnect
gets enabled, because there might be no alarm scheduled.
Call onSetTime() when enabling datetime_synconconnect.
Sync time every 43 hours, 53 minutes and 23 seconds.
Interval is a bit smaller than 2 days.
Interval is a prime (in seconds) so time of sync will slide over time.
If next DST change is less than 48 hours in future, wait for it.
Disconnect devices in all states except GBDevice.State.NOT_CONNECTED.
This should fix devices getting stuck in GBDevice.State.CONNECTING state
when Bluetooth is switched off.
* Add general_reconnectonlytoconnected setting.
* Replace last_device_address shared prefs string with
last_device_addresses shared prefs string set.
Bluetooth address of a device is added to last_device_addresses when
connecting to the device.
Bluetooth address of a device is removed from last_device_addresses only
when deleting the device or explicitly disconnecting from the device
(e.g. by selecting "Disconnect" in the device tile menu).
* Adjust ExternalPebbleJSActivity to better support multiple connected
devices.
* If setting enabled, add source application (or SMS)
* Fallback to using notification subject if body is unavailable
* Trim/cut sender or title at 25+ chars if necessary
* Better support for notifications without body or subject
Implement reading battery percentage.
Implement setting temperature scale used on clock display.
Communication protocol taken from: https://github.com/h4/lywsd02
