Sometimes the connection succeeds but messages are not delivered.

Check the following:

1. Is the client emitting the correct event name?
2. Is the server listening for the same event name?
3. Is the server broadcasting to the intended namespace?
4. Is the client listening for the correct response event?
5. Is the target client connected?
6. Is the target client part of the requested room?
7. Is the server rejecting the payload?
8. Is the event handler registered more than once or being removed unexpectedly?

Event names are case-sensitive. For example, chat:send and Chat:Send are different events.

Add logs at the event receiver and sender to identify where the communication flow stops.

socket.on('chat:send', (payload) => {
  console.log('Received chat:send event');
  console.log('Payload:', payload);

  io.emit('chat:message', payload);

  console.log('Broadcast completed');
});