User Activity

So I just don't get something in BLE,My service discovery says it is from 0x000C up to 0x0011. my service has 2 characteristics.but then I scan the characteristics in that range (from 000C to 0011 ) and get them but also get an gatt error on attribut...
Hello!I need your help in finding a way to know if BLE advertising is active.Thank you 
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