Cannot send RPC with no remote connection.

Unity Engine
,
1

Hello! When connecting to the server, I try to send an RPC command to the server, but it does not work and the console displays “Cannot send RPC with no remote connection.” Why doesn’t it work?

     [WorldSystemFilter(WorldSystemFilterFlags.ClientSimulation | WorldSystemFilterFlags.ThinClientSimulation)]
     public partial struct ClientRequestGameEntrySystem : ISystem
     {
         private EntityQuery _pendingNetworkIdQuery;
    
         public void OnCreate (ref SystemState state)
         {      
             EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<ClientCreatePlayerRequest>().WithNone<NetworkStreamInGame>();
             _pendingNetworkIdQuery = state.GetEntityQuery(builder);
    
             state.RequireForUpdate(_pendingNetworkIdQuery);
         }
    
         public void OnUpdate(ref SystemState state)
         {
    
             ClientCreatePlayerRequest createRequest = SystemAPI.GetSingleton<ClientCreatePlayerRequest>();
    
             EntityCommandBuffer commandBuffer = new EntityCommandBuffer(Allocator.Temp);
             NativeArray<Entity> pendingNetworkingId = _pendingNetworkIdQuery.ToEntityArray(Allocator.Temp);
    
             foreach(var networkID in pendingNetworkingId)
             {
                 commandBuffer.AddComponent<NetworkStreamInGame>(networkID);
    
                 Entity requestEntity = commandBuffer.CreateEntity();
    
                 commandBuffer.AddComponent(requestEntity, new ServerCreatePlayerRequest { PlayerModelID = createRequest.PlayerModelID }) ;
                 commandBuffer.AddComponent(requestEntity, new SendRpcCommandRequest { TargetConnection = networkID });
    
             }
    
             commandBuffer.Playback(state.EntityManager);
             commandBuffer.Dispose();
         }
     }
    
     [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
     public partial struct ServerRequestGameEntrySystem : ISystem
     {
         private EntityQuery _pendingNetworkIdQuery;
    
         public void OnCreate(ref SystemState state)
         {
             EntityQueryBuilder builder = new EntityQueryBuilder(Allocator.Temp).WithAll<ServerCreatePlayerRequest, ReceiveRpcCommandRequest>();
             _pendingNetworkIdQuery = state.GetEntityQuery(builder);
             state.RequireForUpdate(_pendingNetworkIdQuery);
         }
    
         public void OnUpdate(ref SystemState state)
         {
             EntityCommandBuffer commandBuffer = new EntityCommandBuffer(Allocator.Temp);
    
             foreach (var (createPlayerRequest, requestRPC, requestEntity) in SystemAPI.Query<ServerCreatePlayerRequest, ReceiveRpcCommandRequest>().WithEntityAccess())
             {
                 commandBuffer.DestroyEntity(requestEntity);
                 commandBuffer.AddComponent<NetworkStreamInGame>(requestRPC.SourceConnection);
    
                 int clientId = SystemAPI.GetComponent<NetworkId>(requestRPC.SourceConnection).Value;
                 int modelId = createPlayerRequest.PlayerModelID;
                 Debug.Log("Player with id {clientId} created | Model id {modelId}");
             }
             commandBuffer.Playback(state.EntityManager);
             commandBuffer.Dispose();
         }
     }
2

“Cannot send RPC with no remote connection.” it tell u everything, just check connection entity in entities hierarchy in both client world and server world.

3

Issue appears to be in layout of that code. _pendingNetworkIdQuery in the Client system should probably be checking for WithAll (and WithNone), but is instead checking for WithAll. It then proceed to create a singleton with ClientCreatePlayerRequest making the query return a result before any connection has actually been made.