How to use SignalR in an Azure function app?

For example, every minute, an app would make some monsters move. If these monsters are around a specific player, I'd like him to know.

If you’d like to call hub method from your Azure Functions app to broadcast monsters position info to specific players, you can refer to the following sample that works fine on my side.

Hub class

public class ChatHub : Hub
{       

    public void BroadcastMonstersPosition(string MonsterPositionInfo)
    {
        Clients.All.addNewMessageToPage(MonsterPositionInfo);
    }

    //other hub methods
}  

Azure Functions app (timerTrigger)

using System;


public static void Run(TimerInfo myTimer, TraceWriter log)
{
    var hub = new Microsoft.AspNet.SignalR.Client.HubConnection("http://xxxxxx.azurewebsites.net/signalr/hubs");

    var proxy = hub.CreateHubProxy("ChatHub");
    hub.Start().Wait();

    //invoke hub method
    proxy.Invoke("BroadcastMonstersPosition", "new position info");
    log.Info($"C# Timer trigger function executed at: {DateTime.Now}");
}

function.json

{
  "bindings": [
    {
      "name": "myTimer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "0 */1 * * * *"
    }
  ],
  "disabled": false
}

project.json

{
  "frameworks": {
    "net46":{
      "dependencies": {
        "Microsoft.AspNet.SignalR.Client": "2.2.0"
      }
    }
   }
}

Client user can receive message that Azure Functions app send

Besides, if you want to broadcast to specific players instead of all connecting players, you can refer to the following code.

Clients.Clients(clientids_list).addNewMessageToPage(MonsterPositionInfo);