I’m developing a frame exchange sequence between an nRF52840 and an Android smartphone using the BLE protocol.
The service exposed by nRF52840 has the following 16-bit UUID : EB7A
In my Android application, if I only want to retrieve BLE devices that have this service, I need to initialize the filter like this :
private var scanFilters: List<ScanFilter> = arrayListOf( ScanFilter.Builder().setServiceUuid(ParcelUuid(UUID.fromString("0000eb7a-0000-1000-8000-00805f9b34fb")) )
However, if I want to write about a feature of this service, I have to use the following UUID:
I don’t understand why I can’t use the same UUID for filtering as for read/write operations, can you help me?
Source: Android Questions