Hi Benoit
Unfortunately in HAOS, I did’nt managed to get systemctl running nor systemD to launch the service directly.
But launching the script in terminal did work perfectly 
. Doing so, even If I reboot, HA reconnects to mqqt without any action, so this is not an optimized solution but at least it works !
Also Mqtt login works fine and mqqt has been discovered with 37 entities. 
I have copied also your cards and this is simply brillant and thanks to you my old dietrich is alive and monitored in HA 
Now I will try to go from power% to an estimated energy consumption per day… 
Merci encore
Rofiq