Application does not detect services when reconnecting after turning on bluetooth power

Question

When I switch bluetooth when connected to a CoreBluetooth peripheral, I do disconnect and delete all the links to my peripheral device in the centralManagerDidUpdateState .

Performing another scan will find and reconnect to the device and return discoverServices again, but this time around didDiscoverServices never happens. Having deleted all the settings (General → Reset → Reset all settings) or restart it again. Disconnecting / reconnecting, as usual, also works. How can I get around this or delete all cache and UUIDs saved by iOS programmatically?

Answer 1

When you receive a callback in which the state of centralManager has changed to CBCentralManagerStatePoweredOff , you need to scroll through all your peripherals and call cancelConnection: on them. Then you will be fine.

 [_yourCentralManager cancelPeripheralConnection:yourPeripheral]; 

Answer 2

If the central state is CBManagerStatePoweredOn , and call the cancelPeripheralConnection API as follows:

 [self.centralManager cancelPeripheralConnection:self.peripheral]; 

callback method centralManager:didDisconnectPeripheral:error: will be called. But if the state is not CBManagerStatePoweredOn , such as CBManagerStatePoweredOff , this callback will fail.