Thank you for your help.
The event system is active
On the hardware I put also a RFlink Gateway USB and noting happen either. It's like if all what I put in Hardware wasn't working.

The python-dev removes the logs problems but still Python Version: None in the About page and MQTT still didn't work even after a reboot of the server.

Hello, Thank you for your help. I already try to reboot and also restart domoticz. In the logs about python I have : PluginSystem: Failed dynamic library load, install the latest libpython3.x library that is available for your platform. EventSystem - Python: Failed dynamic library load, install the ...

Hello,
I think my problem didn't came from MQTT but Python. When I look the about page in domoticz I have : Python Version: None.
I have python and Libpython v3.7 installed on the system. I checked google and I'm afraid I have to reinstall domoticz except If you have a solution.
Thanks a lot
Arhtur

Hello everyone, I'm running a domoticz on a raspberrypi 4. The domoticz is up to date on the last version. I run on the same machine mosquitto, node-red, grafana. I'm using node-red to send data to domoticz threw mosquitto. Everything was working fine till a few month ago. I had no time to check so ...