Fixed #10329 by timing out when UDP snapshots are not received

core/assets/bundles/bundle.properties

@@ -301,6 +301,7 @@ disconnect.error = Connection error.
 disconnect.closed = Connection closed.
 disconnect.timeout = Timed out.
 disconnect.data = Failed to load world data!
+disconnect.snapshottimeout = Timed out while receiving UDP snapshots.\nThis may be caused by an unstable network or connection.
 cantconnect = Unable to join game ([accent]{0}[]).
 connecting = [accent]Connecting...
 reconnecting = [accent]Reconnecting...

core/src/mindustry/ai/types/MissileAI.java

@@ -10,6 +10,11 @@ import mindustry.gen.*;
 public class MissileAI extends AIController{
     public @Nullable Unit shooter;
 
+    @Override
+    protected void resetTimers(){
+        timer.reset(timerTarget, Mathf.random(3f));
+    }
+
     @Override
     public void updateMovement(){
         unloadPayloads();

core/src/mindustry/content/Blocks.java

@@ -4127,7 +4127,7 @@ public class Blocks{
                 hitEffect = despawnEffect = Fx.hitSquaresColor;
                 buildingDamageMultiplier = 0.2f;
             }},
-            Items.silicon, new BasicBulletType(8f, 34){{
+            Items.silicon, new BasicBulletType(8f, 35){{
                 knockback = 3f;
                 width = 25f;
                 hitSize = 7f;
@@ -4980,7 +4980,7 @@ public class Blocks{
                             fragLifeMin = 0.1f;
                             fragBullets = 5;
                             fragRandomSpread = 0f;
-                            fragSpread = 37f;
+                            fragSpread = 30f;
                             fragBullet = new BulletType(){{
                                 shootEffect = Fx.shootBig;
                                 smokeEffect = Fx.shootSmokeMissileColor;

core/src/mindustry/core/NetClient.java

@@ -34,6 +34,7 @@ import java.util.zip.*;
 import static mindustry.Vars.*;
 
 public class NetClient implements ApplicationListener{
+    private static final long entitySnapshotTimeout = 1000 * 20;
     private static final float dataTimeout = 60 * 30;
     /** ticks between syncs, e.g. 5 means 60/5 = 12 syncs/sec*/
     private static final float playerSyncTime = 4;
@@ -50,6 +51,8 @@ public class NetClient implements ApplicationListener{
     private boolean quietReset = false;
     /** Counter for data timeout. */
     private float timeoutTime = 0f;
+    /** Timestamp for last UDP state snapshot received. */
+    private long lastSnapshotTimestamp;
     /** Last sent client snapshot ID. */
     private int lastSent;
 
@@ -478,6 +481,7 @@ public class NetClient implements ApplicationListener{
     @Remote(variants = Variant.one, priority = PacketPriority.low, unreliable = true)
     public static void entitySnapshot(short amount, byte[] data){
         try{
+            netClient.lastSnapshotTimestamp = Time.millis();
             netClient.byteStream.setBytes(data);
             DataInputStream input = netClient.dataStream;
 
@@ -575,7 +579,18 @@ public class NetClient implements ApplicationListener{
         if(!net.client()) return;
 
         if(state.isGame()){
-            if(!connecting) sync();
+            if(!connecting){
+                sync();
+
+                //timeout if UDP snapshot packets are not received for a while
+                if(lastSnapshotTimestamp > 0 && Time.timeSinceMillis(lastSnapshotTimestamp) > entitySnapshotTimeout){
+                    Log.err("Timed out after not received UDP snapshots.");
+                    quiet = true;
+                    ui.showErrorMessage("@disconnect.snapshottimeout");
+                    net.disconnect();
+                    lastSnapshotTimestamp = 0;
+                }
+            }
         }else if(!connecting){
             net.disconnect();
         }else{ //...must be connecting
@@ -612,6 +627,7 @@ public class NetClient implements ApplicationListener{
         Core.app.post(Call::connectConfirm);
         Time.runTask(40f, platform::updateRPC);
         Core.app.post(ui.loadfrag::hide);
+        lastSnapshotTimestamp = Time.millis();
     }
 
     private void reset(){
@@ -622,6 +638,7 @@ public class NetClient implements ApplicationListener{
         quietReset = false;
         quiet = false;
         lastSent = 0;
+        lastSnapshotTimestamp = 0;
 
         Groups.clear();
         ui.chatfrag.clearMessages();

core/src/mindustry/core/NetServer.java

@@ -1082,7 +1082,7 @@ public class NetServer implements ApplicationListener{
                 try{
                     writeEntitySnapshot(player);
                 }catch(IOException e){
-                    e.printStackTrace();
+                    Log.err(e);
                 }
             });
 

core/src/mindustry/entities/units/AIController.java

@@ -28,8 +28,12 @@ public class AIController implements UnitController{
     protected Teamc target;
 
     {
-        timer.reset(0, Mathf.random(40f));
+        resetTimers();
-        timer.reset(1, Mathf.random(60f));
+    }
+
+    protected void resetTimers(){
+        timer.reset(timerTarget, Mathf.random(40f));
+        timer.reset(timerTarget2, Mathf.random(60f));
     }
 
     @Override