Casio G-Shock Smart Sync

Note: We now support the B2100 series of G-Shock watches!

I think we can do better than the official G-Shock Connected App! This app provides the following extra features:

- Sets watch's reminders from Google Calendar
- Automatically sets correct timezone when travelling. No need to switch between Word Time and Home time
- Use your watch to trigger actions on your phone remotely, like taking pictures, dialling a phone number, etc.
- Auto-configure most watch settings from phone's configuration.
- Phone's alarms can be synced with watch's alarms.
- Super fast connection time: 3.5 seconds vs 12 seconds for the official app.

The supported watches B5000, B5600 and B2100 series:

https://amzn.to/3Mt68Qb
https://amzn.to/4194M13
https://amzn.to/3MUDCGY

General
=======
The app works by sending commands to the watch via Bluetooth (BLE). The watch
data is not persisted on the phone, but instead is read from the watch each
time a connection is established. Any changes on the app are sent back to the
watch, only when the Send to Watch button is pressed.

Setting Time
============
The local time can be set from the main screen by pressing the Send to Watch
button next to the current time display. The app uses your current location to
get the local lime. You can then set the watch time accordingly, without having
to change your World Time selection on the watch.

This screen also shows your Home Time location and battery level.

Alarms
======
The B5600/B5000/B2100 watches have 5 alarms and a Signal or chime setting. They are first read
from the watch, and displayed in the app. The alarms can be updated by pressing
on the time display of each alarm. A dialog will appear which allows you to
select the time.

Once the alarms have been set, you can send them to the watch, or send them to
the Alarm Clock app on the phone. Unfortunately, there is currently no way to
read the alarms from the AlarmClock app programmatically, so we cannot set the
watch alarms from this app. However, we can set the Alarm Clock app with the
watch's alarms.

Events
======
Make sure you have set your phone to auto-sync to your google account.
Otherwise, adding events in your phone will not be reflected to the Google
account, and you will not be able to see the events in the app.

This screen displays Events from your Google Calendar and allows you to send
these events to the watch's reminders. (don't confuse these with reminders in
the Google Calendar app. These reminders are special features and are not
accessible programmatically).

There are many ways to set calendar events in Google Calendar. Events could be
one time, repeating daily, weekly, monthly or yearly, or some complex period
such as every second Thursday of the month. There are also events which occur
number of times only (count events), like repeat this event 12 times every
Monday. Not all event types can be supported on the watch, but this app
attempts to adopt the calendar events to the watch as much as possible. The
only not supported event types are daily and complex events, such as every
second Thursday of the month. Count events are simulated on the watch with
a start and end date, matching the event start time, count and frequency.
In case the calendar event cannot be adopted to a watch reminder, the app
will display the event as Incompatible. Only future events and recurring
events which have not expired are displayed.

The watch only supports all-day reminders. However, if the Google calendar
event has a specific time, it will still be used as a day reminder on the watch.

Actions
=======
The selected actions are run when the user short-presses the lower-right watch
button from disconnected mode (initial screen).

Using these actions, the watch acts like a remote control for your phone.

Where are my World Cities?
==========================
Using an app to manually swap between Home Time and World Time is a bit silly.
Your phone already knows where you are. When setting