1.3.10 Connection Health Monitoring
The Heartbeat PDU (section 188.8.131.52) allows a client to monitor the state of the connection to the server in real time. If the client and server both support connection health monitoring, then the server will send Heartbeat PDUs to the client at a regular cadence when no other data is sent. If no data has been received over a predetermined number of heartbeat intervals by the client, then the server might be down or the network link might be in a disconnected state. If this is the case, the client can respond by displaying a warning or initiating a reconnection attempt.