if USER is SUBBED to a Durable topic,
then when USER disconnects and then connects X minutes later,
SERVER will send the missed messages.
Will probably need to impl ACK frames to support this. Each connection will have some n number of UNACKED/PENDING ACK's and that will the the number of missed messages. So then on Accept_connection for the client, send the last n messages.
if USER is SUBBED to a Durable topic, then when USER disconnects and then connects X minutes later, SERVER will send the missed messages.
Will probably need to impl ACK frames to support this. Each connection will have some n number of UNACKED/PENDING ACK's and that will the the number of missed messages. So then on Accept_connection for the client, send the last n messages.