I am new to Core Bluetooth programming in iOS. Recently I encountered this problem that when connecting to a peripheral, "Bluetooth Pairing Request" alert will pop up on screen. But regardless if I cancelled the request, entered an invalid pin, or simply do nothing,
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
delegate always gets called. That means connection always succeeds. Anyone who can explain why this happens? Thanks.
To connect to a peripheral will trigger (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral; so if the BLE device has the pairing enabled you will get the prompt asking for pairing. In case the pairing is unsuccessful, if the device doesn't have a command to disconnect after unsuccessful pairing it will remain connected, BUT if you try to discover its services (*) and characteristics you'll probably get none (depending how the firmware side of the BLE device has been configured).
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
NSLog(@"Did connect to peripheral: %@", peripheral);
[peripheral setDelegate:self];
[peripheral discoverServices:nil]; //* discover peripheral services
}
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
for (CBService *service in peripheral.services) {
NSLog(@"discovered service [%@]",service.UUID);
[peripheral discoverCharacteristics:nil forService:service];
}
}
swift 3
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral){
self.bleManager.stopScan()
peripheral.discoverServices(nil)
}
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
self.displayToastMessage("Fail to connect")
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?){
if let er = error{
self.displayToastMessage(er as! String)
return
}
if let services = peripheral.services as [CBService]!{
print(services)
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?){
if let arraychar = service.characteristics as [CBCharacteristic]!{
for getCharacteristic in arraychar{
print(getCharacteristic)
}
}
}
