Excellent, do you think this can go to production as is, or do you think something needs to be added?
From a technical point of view regarding the scenarios I described the gap is filled: it is possible to retrieve the information of a device that communicates via MQTT without needing to implement adapters in Node-RED 
Where I lack perspective is on the user experience: is it relevant to reserve these new fields for an « advanced » mode and keep the previous form as the default?
Finally I think it could be nice to have an auto mode for « external IDs » â personally what I did for the test is mqtt:\u003cpiĂ©ce\u003e:\u003cnom_appareil\u003e for the device and `mqtt:\u003cpiĂ©ce\u003e:\u003cappareil\u003e:\
Ok thanks for your feedback 
I think it can stay there, theyâre optional fields anyway!
Totally! I think that will be in a separate PR though
I just merged the PR on custom topics, so this feature will be included in the next version of Gladys 