Interfacing Raspberry Pi 5G HAT with other controller

Question

Gooday, 
 
 I am trying to interface the 5G HAT module with the XIAO ESP32C3 module through the UART and also through the USB to TTL, but both are unsuccessful. 
 Has anyone tried this method? Or is there a different method that can be used? 
 
 Below is the 5G HAT that i am using 
 https://www.waveshare.com/wiki/RM500Q-GL_5G_HAT . 
 
 Appreciate if anyone can help on this

Sonicel · Answer

Hi, the timing and baud rates are the problems in interfacing such as baud rate, X-on, X-off, you need to flash or program the HAT using Hyper terminal or the s/w that came with the controller. And match it with the specifications with your devices. After which you need to fully reset and turn on one device at a time. 
 This should then work, if not, check your C++ script language for errors. you may have to flash the correct software again to make it all match. I notice there is no [end] in the script language or [return]