Best posts made by exblematique

Thank you for your quick answers.
I will try with this new information

Thank you for your all answers.
I have made some tests and even if I don't have results for the moment, the best solution for me seems using (in accordance with @bgunnarb):

MY_MQTT_PUBLISH_TOPIC_PREFIX ESP-topic/ESP-number

Yes, it's can be a good idea @mfalkvidd