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The application runs in its own thread and the entire application framework is event driven

The main entry point of the application is APPLICATION_INIT() where the app has to register its GATT database, configurations and the application create function

No other operations are allowed at this point

Once this is done, the rest of the firmware and the BLE stack will be initialized - and once these are ready- the application create function will be invoked

This is equivalent to C’s main()

Once you return from this function, everything is event driven

Callbacks for connection up/down/end of ADV interval/write to GATT handle, interrupts, timer expiry etc. are all events for the application to handle

So, there is effectively no need for a main() function

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