Simple test app to test mDNS discovery on Android

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private val TAG = "TEST"
  
    private val SERVICE_TYPE = "_googlecast._tcp."
    private val mServiceName = "_googlecast._tcp."
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    private val nsdManager by lazy { getSystemService(NsdManager::class.java) }
    private val discoveryListener = object : NsdManager.DiscoveryListener {

        // Called as soon as service discovery begins.
        override fun onDiscoveryStarted(regType: String) {
            Log.e(TAG, "Service discovery started")
        }

        override fun onServiceFound(service: NsdServiceInfo) {
            // A service was found! Do something with it.
            Log.e(TAG, "Service discovery success$service")
            when {
                service.serviceType != SERVICE_TYPE -> // Service type is the string containing the protocol and
                    // transport layer for this service.
                    Log.d(TAG, "Unknown Service Type: ${service.serviceType}")
                service.serviceName == mServiceName -> // The name of the service tells the user what they'd be
                    // connecting to. It could be "Bob's Chat App".
                    Log.d(TAG, "Same machine: $mServiceName")
//                service.serviceName.contains("NsdChat") -> nsdManager.resolveService(service, resolveListener)
            }
        }

        override fun onServiceLost(service: NsdServiceInfo) {
            // When the network service is no longer available.
            // Internal bookkeeping code goes here.
            Log.e(TAG, "service lost: $service")
        }

        override fun onDiscoveryStopped(serviceType: String) {
            Log.e(TAG, "Discovery stopped: $serviceType")
        }

        override fun onStartDiscoveryFailed(serviceType: String, errorCode: Int) {
            Log.e(TAG, "Discovery failed: Error code:$errorCode")
            nsdManager.stopServiceDiscovery(this)
        }

        override fun onStopDiscoveryFailed(serviceType: String, errorCode: Int) {
            Log.e(TAG, "Discovery failed: Error code:$errorCode")
            nsdManager.stopServiceDiscovery(this)
        }
    }

    override fun onStart() {
        super.onStart()
        nsdManager.discoverServices(SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, discoveryListener)

    }

    override fun onStop() {
        super.onStop()
        nsdManager.stopServiceDiscovery(discoveryListener);
    }


}