Thank you for your reply.
Exactly, I want to change the setting to "MQTT protocol (instant delivery)". However, it is true that I made a mistake. I attributed 1 configuration = 1 person, because each person chooses these applications, and I don't have 2 people who have the same configuration. This model costs me 20 seconds to display all the devices on the MDM main menu.
Do you have a direct command by PSQL allowing me to do this for the 1200 configurations?
I really thank you.