Server alive message
This message is sent periodically from the server (the EK80 program) when there are no changes to values or attribute. The message can be used by the client application to monitor the health of the server, and to detect if the client has lost any messages.
typedef struct
  {
  ParamMsgHdrDef hdr;
  } AliveMessageDef;
•  The lMsgID field of the hdr will have the value 3 (const long lPM_SERVER_ALIVE = 3).
•  The lSeqNo field of the hdr contains the sequence number of the last update message sent from the server. If the sequence number is different from what was expected, the client application must send a Re-transmit request to the server.
Related topics
Handling parameter subscriptions