Exit if we cannot connect to edge router after 10 attempts

Author: oliverhaagh

src/main/java/international/dmc/secom_mms_gateway/mms/MMSAgent.java

@@ -232,6 +232,10 @@ public void afterConnectionClosed(WebSocketSession session, CloseStatus status)
                         retryCount++;
                     }
                 }
+                if (!shuttingDown.get()) {
+                    log.error("Failed to connect to edge router after {} attempts", retryCount);
+                    System.exit(1);
+                }
             }
             session.close();
         }