To start with the good news, the PCB are on their way! We hope to receive them before Christmas.
For the end of the week, I worked on a new LoRa module based on a SX1272 chip. With this chip, I managed to send messages coming from the uart and up to 30 char. I still need to work on the down way (ack and sending message from the server to the device) and on the Over The Air Activation.
I will then still work on LoRa during next week and I should work on its integration with the server.
Have a nice weekend.