MQTT Buffering Published Messages

[shokkul]

Hello

We are using MQTT to feed some data into broker and we are using it as publisher. I read the help page and I set QoS level to 1 and select "Persistent session" from settings. However, when broker or subscriber is disconnected, messages are lost. In WinCC OA How mqtt client manager buffer not sent messages? What are the rules about it? If it is possible that manager is bufferin, which settings should I open?

Thanks

[kilianvp]

Hello

The messages to send should be saved as long as the MQTT driver has no connection? Thats not possible.

[gschijndel]

You could set the retain flag at the address config to let the broker know it should keep the last message of the topic.