CometChat SDK provides you with a mechanism to get real-time status of the connection to CometChat web-socket servers. Connection Status provides you with the below 3 methods to get the status of the connection to CometChat web-socket servers:
Delegate MethodInformation
inConnectingThis method is triggered when CometChat SDK is trying to establish a connection to the web-socket server.
onConnectedThis method is called when CometChat SDK has successfully established a connection and is now connected.
onDisconnectedThis method is called when the CometChat SDK gets disconnected due to any issue while maintaining the connection like network fluctuations, etc.
onFeatureThrottledCometChat automatically toggles off certain features to prevent performance loss for end-users under various circumstances.
onConnectionErrorThis method is called when the CometChat SDK encounters an error while maintaining the connection, such as network fluctuations, etc.
Once the connection is broken, the disconnected callback is triggered, the SDK automatically tries to establish the connection again, thus going into the connecting state and triggering the connecting method. Once the attempt to connect is successful, the connected method is triggered thus letting the developer know that the connection is established and is active. To receive real-time connection status, you need to register ConnectionListener wherever you wish to receive the real-time status. You can use the addConnectionListener() method to do so. 
var listenerID = "UNIQUE_LISTENER_ID";
CometChat.addConnectionListener(
  listenerID,
  new CometChat.ConnectionListener({
    onConnected: () => {
      console.log("ConnectionListener => On Connected");
    },
    inConnecting: () => {
      console.log("ConnectionListener => In connecting");
    },
    onDisconnected: () => {
      console.log("ConnectionListener => On Disconnected");
    },
    onFeatureThrottled: () => {
      console.log("ConnectionListener => On Feature Throttled");
    },
    onConnectionError: () => {
      console.log("ConnectionListener => On Connection Error");
    },
  })
);
We recommend you to add the Connection Listener in your method on app startup, preferably in the index.js file. Once you have successfully initialized CometChat.
You can also get the current connection status by using getConnectionStatus property provided by CometChat SDK 
var connectionStatus = CometChat.getConnectionStatus();
The CometChat.getConnectionStatus method will return either of the below 4 values:
  1. CometChat.CONNECTION_STATUS.CONNECTED (connected)
  2. CometChat.CONNECTION_STATUS.CONNECTING (connecting)
  3. CometChat.CONNECTION_STATUS.DISCONNECTED (disconnected)
  4. CometChat.CONNECTION_STATUS.FEATURE_THROTTLED (featureThrottled)