How to work with AUX USART port on Quectel_M80_EVB development board?

Question

mobile connection

It was necessary to enable AUX UART on the Quectel_M80_EVB debug board.
How to do this, I figured out, you just need to use the AT + QEAUART = 1 command.
But for some reason, not all commands sent to this port are processed correctly.
Example:
If you send the command AT+QIOPEN="TCP", "178.210.78.13",80\r\n to the MAIN UART port, then everything works fine.
But if the same command is sent to the AUX USART port, then the board issues ERROR.
Can anyone tell me what is the peculiarity of working with different ports here?

Answer 1

In principle, transmission of TCP commands is prohibited through the AUX port.