StoNeD510 StoNeD510 - 4 days ago 5
iOS Question

Bluetooth Peripheral Stuck in "Connecting" State On iOS

I am trying to connect to my Arduino project that is using the BlueFruit BLE spi module. I am having an issue when trying to connect using my iOS app. After I have found the device I try to connect to it but the state gets stuck in 'connecting' state=1. This prevent me from searching the services and such because a 'connected' state isn't achieved
Here is a code snip...

//check state of the bluetooth on phone
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if central.state == .poweredOff{
//TODO: ADD SAVE DATA TO REALM BEFORE DISSMISSING
errorView.isHidden = false
}
if central.state == .poweredOn{
errorView.isHidden = true
//scan for peripherals with the service i created
central.scanForPeripherals(withServices: nil, options: nil)
}
}

//devices found(should only be ours because we will create Unique serviceID)
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
// get advertisement data and check to make sure the name is matching. set it as the peripheral then make connection
if let peripheralName = advertisementData[CBAdvertisementDataLocalNameKey] as? String {
print("NEXT PERIPHERAL NAME: \(peripheralName)")
print("NEXT PERIPHERAL UUID: \(peripheral.identifier.uuidString)")

if peripheralName == nameID{
manager.stopScan()
self.peripheralHalo = peripheral
peripheralHalo!.delegate = self
manager.connect(peripheral, options: nil)

while(peripheralHalo?.state.rawValue == 1)
{
if(manager.retrieveConnectedPeripherals(withServices: [serviceID]).count > 0 ){
print("\(manager.retrieveConnectedPeripherals(withServices: [serviceID]))")
}
}
}
print("Connected!!")
}


When I call manager.connect(peripheral, options: nil) , the peripheral tries to connect. I add the following while loop for testing and always shows the state as "connecting". I have tried the LightBlue iOS app and i can properly connect and receive notifications of characteristic value changes so the Arduino firmware should be all good.PLEASE HELP!!!

Answer

You don't want that while loop; This will just block the Core Bluetooth delegate thread. After issuing the connect you will get a call to the didConnect CBCentralManagerDelegate method. Once the peripheral is connected you need to call discoverServices on the peripheral, which will give a callback to the peripheral:didDiscoverServices: peripheral delegate method. You can then discover the characteristics in a similar way.

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
// get advertisement data and check to make sure the name is matching. set it as the peripheral then make connection
    if let peripheralName = advertisementData[CBAdvertisementDataLocalNameKey] as? String {
        print("NEXT PERIPHERAL NAME: \(peripheralName)")
        print("NEXT PERIPHERAL UUID: \(peripheral.identifier.uuidString)")

        if peripheralName == nameID {
            self.peripheralHalo = peripheral
            central.stopScan()
            central.connect(peripheral, options: nil)
        }
    }
}

func centralManager(_ central: CBCentralManager, 
              didConnect peripheral: CBPeripheral) {
    print("Connected!!")
    peripheralHalo!.delegate = self
    peripheral.discoverServices([serviceID)
}

Also, if you are going to store something that identifies which peripheral you want to connect to, I suggest you use the identifier and not the name as the name can change.

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