My application users log on, log off and then later log on again. How do I discard queued messages from the old session?
There are two solutions to address this:
restore:false. This will prevent old messages from being sent to a user that logged off and back on again.
- Include timestamps with published messages. Your application can ignore messages dating before a set delay.
Here is an example for the 2nd solution in PHP:
$t = time() . ""; $m = array("serial" => $t, "payload" => "Hello from PHP! " . $t); $publish_success = $pubnub->publish(array('channel' => $c, 'message' => $m));
In this example, the
serial attribute is set to the timestamp of the message being published. By tracking the serial number on the client, you can verify if a message was received already.