Class B Device module AT Command

Hi All !

I am using the RAK831 gateway with the 1 PPS GPS / LoRa Server.
I would like to evaluate tue LoRaWAN Class B with minimum software dev.
In other words, I would like to use a module with AT commands in order to avoid to implement Lora-net/LoRaMac-node C software development.
Can some one propose a device HW/SW solution to help me ?

I already have some HW (pyCom, Rak811, RN2483) that I can upgrade to propose class B.