Schneider Wiser for KNX - MQTT Problem with receiving Messages

[Neo8101]

Dear forum members and admins,

I am using a Schneider Wiser for KNX as Logic Controller for my KNX Installation. In parallel I am running a MQTT Broker/Server (ioBroker) as the LM MQTT Broker App is unfortunately not available for Schneider Wiser. 

I am using these scripts for receiving and sending MQTT messages. Sending from Wiser works perfectly, but I am having some issues during receiving messages on Wiser.
When I first start the script for receiving messages, it works as expected. Subscriptions seem to be registered on the Broker side and I once receive the values and can see them in the corresponding group addresses. 
But any further change on Broker/Server side is not received by Wiser.  I first have to stop the script and restart it, then values are again transmitted once. 

To be honest I do not fully understand the provided script, although I have some experience with programming. So I have no clue where the problem could come from. The fact that I receive the values once after start of the script makes me think that the implementation can't be completely wrong.

I would appreciate any tips where the problem could come from. If you need any more information, please let me know.

Best regards and Thanks in advance,
Chris

[Neo8101]

Okay, I found it  .

I did not send an clientID. As soon as this is filled, everything works perfect.

Code:

mclient = require('mosquitto').new('wiser')