Hello, I configure the raspberry gateway to use MQTT. I set mosquitto as the broker. The problem that I encounter is that when I subscribe to test if the gateway publish on the broker, I have empty message. So my first guess is that there is an issue somewhere which cause that only empty message are sent.

Here is my arduino code : https://pastebin.com/YKi4EAad
The RasperryPI3 config & logs : https://pastebin.com/Kjn8CC8A
The MQTT Client logs : https://pastebin.com/ZP8GrkTj