But mine need to be more robust so a little more deeper reserch make me feel on an nice firmware of MQTT protocole handler for esp called Homie.
Homie is awesome and at this moment, some great-opensource-developers are currently working hard on next version (2.0.0) so for the moment I played with V1.5 witch is really not so bad.
Till then I was waiting for my components to arrive (from china...) I have read alot on configurating it on esp8266.
Well for the moment, I do not fear that anoter "man in the middle" use my data... but for that He will be at least be able to log in my wifi or internal network!!!
What are the vulnerabilities that a hacker can exploit in the esp8266 board if he wanted to exploit your temperature sensor