As shown in figure to transmit command to soft serial port using LORA module with serial. After the write output to the serial port but no response will only output the received data
However use serial debugging assistant send command is no problem (normal) receives the command will return the related instructions, or how to use c + + code to send command serial debugging assistant
Using the MODBUS protocol to send commands arduino environment seeeduino xiao development board

PortOne. Listen ();

If (portOne. Available () & gt; 0)
{
Char I=portOne. Read ();
Serial. Write (I);