I’m trying to find out, what is the best method to find out, if the MQTT client is currently connected to a Server.

After analysing of   Ping /vs/ KeepAlive I’ve realised they are the “same”, so there was no need to create a Timer for myself to regularly call Ping.

I also know by now, that checking if (MQ_CL.Online = True) is not good, because it is getting false only after a full disconnect.

So my question is:

 – What is the best method to find out, if the server is responsive = online currently?
  (Did not went offline since the last 1500ms)

Problems I’ve faced so far:

– OnMON did not gets triggered on Ping responce
– nor MQTT server
>> because “Ping” is an inner mechanism, invisible to the user.

– Also I do not understand concept in the code of the relation of “KeepAliveCount := KeepAlive * 10”

The server is running mostly the same PC, or max via LAN. (ping < 500ms)

Delphi7, 32bit;  Windows 7+; ICS v9.5 2025-09-19;  MQTT v3.1.1;  MQTT server: Node-RED Aedes

I’m trying to find out, what is the best method to find out, if the MQTT client is currently connected to a Server.

After analysing of   Ping /vs/ KeepAlive I’ve realised they are the “same”, so there was no need to create a Timer for myself to regularly call Ping.

I also know by now, that checking if (MQ_CL.Online = True) is not good, because it is getting false only after a full disconnect.

So my question is:

 – What is the best method to find out, if the server is responsive = online currently?
  (Did not went offline since the last 1500ms)

Problems I’ve faced so far:

– OnMON did not gets triggered on Ping responce
– nor MQTT server
>> because “Ping” is an inner mechanism, invisible to the user.

– Also I do not understand concept in the code of the relation of “KeepAliveCount := KeepAlive * 10”

The server is running mostly the same PC, or max via LAN. (ping < 500ms)

Delphi7, 32bit;  Windows 7+; ICS v9.5 2025-09-19;  MQTT v3.1.1;  MQTT server: Node-RED Aedes