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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