Respect updated DNS SD broadcast names

When a device is advertising over dns-sd and the TX bits change (device
name) a message is sent out to indicate that the old adverisment should
be expired and the new one should be used.

In the current implementation of the casting app, we stop listening to
updates after the `discoveryDurationSeconds` timeout. This causes us to
miss messages and Android seems to fall back to the cached value of the
DNS advertisment.

We need to change the usage pattern here so that clients stop the
discovery manually after it is started and keep it active for the
lifetime they need it for.

I also updated the test apps to behave a bit nicer with discovered
commissioners.

examples/tv-casting-app/android/App/app/src/main/java/com/chip/casting/app/CommissionerDiscoveryFragment.java

@@ -8,25 +8,38 @@
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
 import android.widget.Button;
-import android.widget.LinearLayout;
+import android.widget.ListView;
+import android.widget.TextView;
 import androidx.annotation.Nullable;
-import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.Fragment;
 import com.chip.casting.DiscoveredNodeData;
 import com.chip.casting.FailureCallback;
 import com.chip.casting.MatterError;
 import com.chip.casting.SuccessCallback;
 import com.chip.casting.TvCastingApp;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
 
 /** A {@link Fragment} to discover commissioners on the network */
 public class CommissionerDiscoveryFragment extends Fragment {
   private static final String TAG = CommissionerDiscoveryFragment.class.getSimpleName();
-  private static final long DISCOVERY_DURATION_SECS = 10;
+  private static final long DISCOVERY_POLL_INTERVAL_MS = 15000;
+  private static final List<DiscoveredNodeData> commissionerVideoPlayerList = new ArrayList<>();
+  private FailureCallback failureCallback;
+  private SuccessCallback<DiscoveredNodeData> successCallback;
+  private ScheduledFuture poller;
   private final TvCastingApp tvCastingApp;
+  private ScheduledExecutorService executor;
 
   public CommissionerDiscoveryFragment(TvCastingApp tvCastingApp) {
     this.tvCastingApp = tvCastingApp;
+    this.executor = Executors.newSingleThreadScheduledExecutor();
   }
 
   /**
@@ -56,75 +69,113 @@ public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
     super.onViewCreated(view, savedInstanceState);
 
     Button manualCommissioningButton = getView().findViewById(R.id.manualCommissioningButton);
+    // In the ideal case we wouldn't rely on the host activity to maintain this object since
+    // the lifecycle of the context isn't tied to this callback. Since this is an example app
+    // this should work fine.
     Callback callback = (Callback) this.getActivity();
     View.OnClickListener manualCommissioningButtonOnClickListener =
-        new View.OnClickListener() {
-          @Override
-          public void onClick(View v) {
-            callback.handleCommissioningButtonClicked(null);
-          }
-        };
+        v -> callback.handleCommissioningButtonClicked(null);
     manualCommissioningButton.setOnClickListener(manualCommissioningButtonOnClickListener);
+    ArrayAdapter<DiscoveredNodeData> arrayAdapter =
+        new VideoPlayerCommissionerAdapter(getActivity(), commissionerVideoPlayerList);
+    final ListView list = getActivity().findViewById(R.id.commissionerList);
+    list.setAdapter(arrayAdapter);
+    list.setOnItemClickListener(
+        (parent, view1, position, id) -> {
+          DiscoveredNodeData discoveredNodeData =
+              (DiscoveredNodeData) parent.getItemAtPosition(position);
+          Log.d(TAG, "OnItemClickListener.onClick called for " + discoveredNodeData);
+          Callback callback1 = (Callback) getActivity();
+          callback1.handleCommissioningButtonClicked(discoveredNodeData);
+        });
 
-    Context context = this.getContext();
-    SuccessCallback<DiscoveredNodeData> successCallback =
+    this.successCallback =
         new SuccessCallback<DiscoveredNodeData>() {
           @Override
           public void handle(DiscoveredNodeData discoveredNodeData) {
             Log.d(TAG, "Discovered a Video Player Commissioner: " + discoveredNodeData);
-            String buttonText = getCommissionerButtonText(discoveredNodeData);
-
-            if (!buttonText.isEmpty()) {
-              Button commissionerButton = new Button(context);
-              commissionerButton.setText(buttonText);
-              CommissionerDiscoveryFragment.Callback callback =
-                  (CommissionerDiscoveryFragment.Callback) getActivity();
-              commissionerButton.setOnClickListener(
-                  new View.OnClickListener() {
-                    @Override
-                    public void onClick(View v) {
-                      Log.d(
-                          TAG,
-                          "CommissionerResolveListener.onServiceResolved.OnClickListener.onClick called for "
-                              + discoveredNodeData);
-                      callback.handleCommissioningButtonClicked(discoveredNodeData);
-                    }
-                  });
-              new Handler(Looper.getMainLooper())
-                  .post(
-                      () ->
-                          ((LinearLayout) getActivity().findViewById(R.id.castingCommissioners))
-                              .addView(commissionerButton));
-            }
+            new Handler(Looper.getMainLooper())
+                .post(
+                    () -> {
+                      if (commissionerVideoPlayerList.contains(discoveredNodeData)) {
+                        Log.d(TAG, "Replacing existing entry in players list");
+                        arrayAdapter.remove(discoveredNodeData);
+                      }
+                      arrayAdapter.add(discoveredNodeData);
+                    });
           }
         };
 
-    FailureCallback failureCallback =
+    this.failureCallback =
         new FailureCallback() {
           @Override
           public void handle(MatterError matterError) {
             Log.e(TAG, "Error occurred during video player commissioner discovery: " + matterError);
+            if (MatterError.DISCOVERY_SERVICE_LOST == matterError) {
+              Log.d(TAG, "Attempting to restart service");
+              tvCastingApp.discoverVideoPlayerCommissioners(successCallback, this);
+            }
           }
         };
 
     Button discoverButton = getView().findViewById(R.id.discoverButton);
     discoverButton.setOnClickListener(
-        new View.OnClickListener() {
-          @Override
-          public void onClick(View v) {
-            Log.d(TAG, "Discovering on button click");
-            tvCastingApp.discoverVideoPlayerCommissioners(
-                DISCOVERY_DURATION_SECS, successCallback, failureCallback);
-          }
+        v -> {
+          Log.d(TAG, "Discovering on button click");
+          tvCastingApp.discoverVideoPlayerCommissioners(successCallback, failureCallback);
         });
+  }
 
+  @Override
+  public void onResume() {
+    super.onResume();
     Log.d(TAG, "Auto discovering");
-    tvCastingApp.discoverVideoPlayerCommissioners(
-        DISCOVERY_DURATION_SECS, successCallback, failureCallback);
+
+    poller =
+        executor.scheduleAtFixedRate(
+            () -> {
+              tvCastingApp.discoverVideoPlayerCommissioners(successCallback, failureCallback);
+            },
+            0,
+            DISCOVERY_POLL_INTERVAL_MS,
+            TimeUnit.MILLISECONDS);
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+    tvCastingApp.stopVideoPlayerDiscovery();
+    poller.cancel(true);
   }
 
-  @VisibleForTesting
-  public String getCommissionerButtonText(DiscoveredNodeData commissioner) {
+  /** Interface for notifying the host. */
+  public interface Callback {
+    /** Notifies listener of Commissioning Button click. */
+    void handleCommissioningButtonClicked(DiscoveredNodeData selectedCommissioner);
+  }
+}
+
+class VideoPlayerCommissionerAdapter extends ArrayAdapter<DiscoveredNodeData> {
+  private final List<DiscoveredNodeData> playerList;
+  private LayoutInflater inflater;
+
+  public VideoPlayerCommissionerAdapter(
+      Context applicationContext, List<DiscoveredNodeData> playerList) {
+    super(applicationContext, 0, playerList);
+    this.playerList = playerList;
+    inflater = (LayoutInflater.from(applicationContext));
+  }
+
+  @Override
+  public View getView(int i, View view, ViewGroup viewGroup) {
+    view = inflater.inflate(R.layout.commissionable_player_list_item, null);
+    String buttonText = getCommissionerButtonText(playerList.get(i));
+    TextView playerDescription = view.findViewById(R.id.commissionable_player_description);
+    playerDescription.setText(buttonText);
+    return view;
+  }
+
+  private String getCommissionerButtonText(DiscoveredNodeData commissioner) {
     String main = commissioner.getDeviceName() != null ? commissioner.getDeviceName() : "";
     String aux =
         "" + (commissioner.getProductId() > 0 ? "Product ID: " + commissioner.getProductId() : "");
@@ -141,10 +192,4 @@ public String getCommissionerButtonText(DiscoveredNodeData commissioner) {
     String preCommissioned = commissioner.isPreCommissioned() ? " (Pre-commissioned)" : "";
     return main + aux + preCommissioned;
   }
-
-  /** Interface for notifying the host. */
-  public interface Callback {
-    /** Notifies listener of Commissioning Button click. */
-    void handleCommissioningButtonClicked(DiscoveredNodeData selectedCommissioner);
-  }
 }

examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/DiscoveredNodeData.java

@@ -23,6 +23,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 public class DiscoveredNodeData {
   private static final int MAX_IP_ADDRESSES = 5;
@@ -182,4 +183,25 @@ public String toString() {
         + ipAddresses
         + '}';
   }
+
+  // autogenerated
+  @Override
+  public int hashCode() {
+    int result = Objects.hash(vendorId, productId, commissioningMode, deviceType);
+    result = 31 * result + Arrays.hashCode(rotatingId);
+    return result;
+  }
+
+  // autogenerated
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o == null || getClass() != o.getClass()) return false;
+    DiscoveredNodeData that = (DiscoveredNodeData) o;
+    return vendorId == that.vendorId
+        && productId == that.productId
+        && commissioningMode == that.commissioningMode
+        && deviceType == that.deviceType
+        && Objects.equals(hostName, that.hostName);
+  }
 }

examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/MatterError.java

@@ -23,6 +23,9 @@ public class MatterError {
   private int errorCode;
   private String errorMessage;
 
+  public static final MatterError DISCOVERY_SERVICE_LOST =
+      new MatterError(4, "Discovery service was lost.");
+
   public static final MatterError NO_ERROR = new MatterError(0, null);
 
   public MatterError(int errorCode, String errorMessage) {

examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/NsdDiscoveryListener.java

@@ -95,6 +95,7 @@ public void onServiceLost(NsdServiceInfo service) {
     // When the network service is no longer available.
     // Internal bookkeeping code goes here.
     Log.e(TAG, "Service lost: " + service);
+    failureCallback.handle(MatterError.DISCOVERY_SERVICE_LOST);
   }
 
   @Override

examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/TvCastingApp.java

@@ -32,8 +32,6 @@
 import chip.platform.PreferencesKeyValueStoreManager;
 import java.util.Arrays;
 import java.util.List;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
 
 public class TvCastingApp {
   private static final String TAG = TvCastingApp.class.getSimpleName();
@@ -44,6 +42,11 @@ public class TvCastingApp {
   private Context applicationContext;
   private ChipAppServer chipAppServer;
   private NsdManagerServiceResolver.NsdManagerResolverAvailState nsdManagerResolverAvailState;
+  private boolean discoveryStarted = false;
+
+  private WifiManager.MulticastLock multicastLock;
+  private NsdManager nsdManager;
+  private NsdDiscoveryListener nsdDiscoveryListener;
 
   public boolean initApp(Context applicationContext, AppParameters appParameters) {
     if (applicationContext == null || appParameters == null) {
@@ -103,21 +106,25 @@ public boolean initApp(Context applicationContext, AppParameters appParameters)
   private native boolean initJni(AppParameters appParameters);
 
   public void discoverVideoPlayerCommissioners(
-      long discoveryDurationSeconds,
       SuccessCallback<DiscoveredNodeData> discoverySuccessCallback,
       FailureCallback discoveryFailureCallback) {
     Log.d(TAG, "TvCastingApp.discoverVideoPlayerCommissioners called");
 
+    if (this.discoveryStarted) {
+      Log.d(TAG, "Discovery already started, stopping before starting again");
+      stopVideoPlayerDiscovery();
+    }
+
     List<VideoPlayer> preCommissionedVideoPlayers = readCachedVideoPlayers();
 
     WifiManager wifiManager =
         (WifiManager) applicationContext.getSystemService(Context.WIFI_SERVICE);
-    WifiManager.MulticastLock multicastLock = wifiManager.createMulticastLock("multicastLock");
+    multicastLock = wifiManager.createMulticastLock("multicastLock");
     multicastLock.setReferenceCounted(true);
     multicastLock.acquire();
 
-    NsdManager nsdManager = (NsdManager) applicationContext.getSystemService(Context.NSD_SERVICE);
-    NsdDiscoveryListener nsdDiscoveryListener =
+    nsdManager = (NsdManager) applicationContext.getSystemService(Context.NSD_SERVICE);
+    nsdDiscoveryListener =
         new NsdDiscoveryListener(
             nsdManager,
             DISCOVERY_TARGET_SERVICE_TYPE,
@@ -129,20 +136,23 @@ public void discoverVideoPlayerCommissioners(
 
     nsdManager.discoverServices(
         DISCOVERY_TARGET_SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, nsdDiscoveryListener);
+    Log.d(TAG, "TvCastingApp.discoverVideoPlayerCommissioners started");
+    this.discoveryStarted = true;
+  }
 
-    Executors.newSingleThreadScheduledExecutor()
-        .schedule(
-            new Runnable() {
-              @Override
-              public void run() {
-                Log.d(TAG, "TvCastingApp stopping Video Player commissioner discovery");
-                nsdManager.stopServiceDiscovery(nsdDiscoveryListener);
-                multicastLock.release();
-              }
-            },
-            discoveryDurationSeconds,
-            TimeUnit.SECONDS);
-    Log.d(TAG, "TvCastingApp.discoverVideoPlayerCommissioners ended");
+  public void stopVideoPlayerDiscovery() {
+    Log.d(TAG, "TvCastingApp trying to stop video player discovery");
+    if (this.discoveryStarted
+        && nsdManager != null
+        && multicastLock != null
+        && nsdDiscoveryListener != null) {
+      Log.d(TAG, "TvCastingApp stopping Video Player commissioner discovery");
+      nsdManager.stopServiceDiscovery(nsdDiscoveryListener);
+      if (multicastLock.isHeld()) {
+        multicastLock.release();
+      }
+      this.discoveryStarted = false;
+    }
   }
 
   public native boolean openBasicCommissioningWindow(

examples/tv-casting-app/android/App/app/src/main/res/layout/commissionable_player_list_item.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/commissionable_player_description"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="10dp"
+        android:text="blah"
+        android:textAlignment="center"
+        android:textColor="@android:color/black"
+        android:textSize="20dp" />
+
+</LinearLayout>

examples/tv-casting-app/android/App/app/src/main/res/layout/fragment_commissioner_discovery.xml

@@ -31,6 +31,11 @@
             android:layout_height="wrap_content"
             android:text="@string/discovery_message_text"
             android:textAppearance="@style/TextAppearance.AppCompat.Medium" />
+
+        <ListView
+            android:id = "@+id/commissionerList"
+            android:layout_width = "wrap_content"
+            android:layout_height = "wrap_content"/>
     </LinearLayout>