Unable to discover devices on Android 13

Hello,

We tried to use the package 3.5.12 and found out that discovering devices on Android 10 works fine, but it does not work on Android 13. Including MulticastLock does not help as well. However, if registering a service in the app it can discover it with no issue.

We have also provided these permissions:

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />

Code:


class MdnsRepository @Inject constructor(
    private val context: Context
) {
    private var multicastLock: WifiManager.MulticastLock? = null

    fun discoverServices(serviceType: String, onServiceFound: (ServiceInfo) -> Unit) {
        Log.d("MdnsRepository", "Starting service discovery for type: $serviceType")

        // Acquire the multicast lock
        val wifi = context.getSystemService(Context.WIFI_SERVICE) as WifiManager?
        if (wifi != null) {
            val lock = wifi.createMulticastLock("HelloAndroid")
            lock.acquire()
            Log.d("MdnsRepository", "Multicast lock acquired")
        }

        try {
            val jmdns = JmDNS.create()

//             Register a service
            val serviceInfo =
                ServiceInfo.create("_test._tcp.local.", "example", 1234, "path=index.html")
            jmdns.registerService(serviceInfo)

            Log.d("MdnsRepository", "JmDNS instance created successfully")

            jmdns.addServiceListener(serviceType, object : ServiceListener {
                override fun serviceAdded(event: ServiceEvent) {
                    Log.d("MdnsRepository", "Service added: ${event.info.name}")
                }

                override fun serviceRemoved(event: ServiceEvent) {
                    Log.d("MdnsRepository", "Service removed: ${event.info.name}")
                }

                override fun serviceResolved(event: ServiceEvent) {
                    val serviceInfo = event.info
                    Log.d("MdnsRepository", "Service resolved: ${serviceInfo.name} - ${serviceInfo.inetAddresses.joinToString()}")
                    onServiceFound(serviceInfo)
                }
            })
        } catch (e: Exception) {
            Log.e("MdnsRepository", "Error during service discovery", e)
        } finally {
            // Release multicast lock when done
            multicastLock?.release()
        }
    }
}

Tested on S24 and emulator.

jmdns / jmdns

Unable to discover devices on Android 13 #286