@Colateral Thanks for your reply. My post below provides all the answers to the questions you asked. Not only does it have the version number of the firmware that I'm using, it also has all the code for both the node and the gateway.
Hi @Roberto I tried to modify your code because I need to send a payload that contains the current time with a header containing mac address of the node and the length of the payload. Everything went well on the node side but rated nano gateway I have an Index Error: bytes index out of rang. it is because the adresse mac ? knowing that lora.mac() give : b'p\xb3\xd5I\x95kA\xf3' with length=8 but i don't understand what does mean the : b'p......' and how the length is 8 !!