signalR retry on initial connection failure

Inspectron.Epson/PrintServer/JobSources/SignalRPrintJobSource.cs

@@ -37,16 +37,21 @@ public class SignalRPrintJobSource: IPrintJobSource
     }
 
     private async Task InitializeConnectionAsync()
+    {
+        while (true)
         {
             try
             {
                 await _connection.StartAsync();
                 await _connection.InvokeAsync("JoinGroup", _groupConfiguration.RestaurantId);
                 _logger.LogInformation("SignalR connection started and joined group {GroupId}.", _groupConfiguration.RestaurantId);
+                return;
             }
             catch (Exception ex)
             {
-            _logger.LogError(ex, "Failed to initialize SignalR connection.");
+                _logger.LogError(ex, "Failed to initialize SignalR connection. Retrying in 5 seconds...");
+                await Task.Delay(5000);
+            }
         }
     }