How can I check if a message that is sent by the WEBSOCKETS Server has been delivered to the endpoint?
Use this class: link
How can I check if a message that is sent by the WEBSOCKETS Server has been delivered to the endpoint?
Use this class: link
The class has some predictions for failure: the wsSendClientMessage method of this class returns false if not all the content could be sent, and the class periodically "drips" clients to detect a hung or disconnected client.
If you need to be sure that the customer has received and understood the message, have the customer send a confirmation message. Even if it were a Socket.IO framework, which does automatic reconnection and retransmission, a positive acknowledgment is the best form.