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communication with sensor tag CC2541 via android app

Other Parts Discussed in Thread: CC2541

I have started with a project that needs to communicate with the BLE sensor tag module CC2541.

Till now, I have been able to search the device  make connection between my android app and the sensor tag but i have no clue how to start with the communication henceforth.

There is a confusion regarding the UUIDs required for every service. Since, we I will be using a PIR sensor on the micro controller side and program has been developed for the same.

I wish to understand that are these UUIDs generated randomly and do I need to mention them in my C header files or its just required in android with any random value.

Thanks