Send a message from Android to pinetime via BLE

I would like to send an integer number from a flutter app on adnroid to pinetime, but don't know how to use the ble service.

I've already managed to develop a flutter app on my android device that sends a notification to pinetime.
I've also managed to flash a new application to pinetime.

Now, I want to send an integer message (not a notification) to my new app.

What will be the best way to do so? and do you have any example code to share?


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