Microchip RN4020 & # 8594; Sample IOS Code for MLDP Mode

Question

For several years, Microchip has released the RN4020 BT LE chip with a private MLDP profile. However, there is no iOS source code available yet, although they do have an iOS app in the Apple App Store. Does anyone have any working code and want to share / post it?

Thank!

Tim

Answer 1

I have a working code. Here I will give some fragments. In the first ViewController that matches CBCentralManagerDelegate, we have:

var cbc : CBCentralManager? = nil

override func viewDidLoad() {
    super.viewDidLoad()
    cbc = CBCentralManager(delegate: self, queue: nil)
}

the touch of a button starts scanning for peripherals

@IBAction func scan(_ sender: Any) {
    cbc?.scanForPeripherals(withServices: nil, options: nil)
}

for each peripheral device the next delegate member is found, which will be called

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    // store peripherals here to let select user one
    NSLog("name=%@", peripheral.name ?? "unnamed")
}

, . ,

@IBAction func connect(_ sender: Any) {
    // selectedPeripheral set by selection from the table view
    cbc?.connect(selectedPeripheral!, options: nil)
}

:

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    performSegue(withIdentifier: "ConnectPeriph", sender: self)
}

ViewController, . ViewController CBPeripheralDelegate :

var periph : CBPeripheral!  // selected peripheral
var dataChar : CBCharacteristic?  // characteristic for data transfer

let mchpPrivateService : CBUUID = CBUUID(string: "00035B03-58E6-07DD-021A-08123A000300")
let mchpDataPrivateChar : CBUUID = CBUUID(string: "00035B03-58E6-07DD-021A-08123A000301")

- , :

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    periph.delegate = self
    periph.discoverServices(nil)
}

:

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    if let e = error {
        NSLog("Error %@", e.localizedDescription)
    }
    else if let services = peripheral.services {
        for s in services {
            NSLog("Service=%@", s.uuid.uuidString)
            if s.uuid.isEqual(mchpPrivateService) {
                peripheral.discoverCharacteristics(nil, for: s)
            }
        }
    }
}

, , :

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    NSLog("characteristics for service %@", service.uuid.uuidString)
    if let characteristics = service.characteristics {
        for c in characteristics {
            if c.uuid.isEqual(mchpDataPrivateChar) {
                peripheral.setNotifyValue(true, for: c)
                dataChar = c
            }
        }
    }
}

, , , uuid mchpDataPrivateChar. :

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    NSLog("update value for %@", characteristic.uuid)
    if let d = characteristic.value {
        var s : String = String()
        for b in d {
            s.append(Character(UnicodeScalar(b)))
        }
        NSLog("received \(d.count) bytes: \(s)")
    }
}

iOS. :

@IBAction func sendClicked(_ sender: Any) {
    if let d = dataChar, let s=sendEdit.text {
        let buffer : [UInt8] = Array(s.utf8)
        let data : Data = Data(buffer)
        periph.writeValue(data, for: d, type: .withResponse)
    }
}