GL-X300B to STM32 interface

Hi, has anyone tried to interface the GL-X300B collie gateway with an STM32? I am trying to set it up so that my microcontroller can receive and send SMS messages, but am uncertain if it is possible to configure the modem to receive AT commands via RJ45, has anyone attempted this before?

In theory, it’s possible but I have not tried a similar solution and cannot give you a very accurate answer.
You need to develop an application on the X300B that forwards AT commands to the serial port of the 4G modem.