SIM7600G-H CAT4 4G (LTE) Shield for Arduino

[SGian.1]

Hi there ! 

I start to work with this shield, and i use one STM32G071 for control the UART comunication. The module work at 115200baute rate , and i use the AT command for comunicate with her. So everthingh work fine except when i send ATE0 for turn off the echo this command send back ok but afther i send the other command the answert i receive it’s look like the echo still on . Examplke i send AT\r\n i receive back AT\r\n\r\nok\r\n i try to wait to send the next command but nothingh still dosen’t work. I know i can continus to work eaven send me back the echo but this stuff make me crazy because i don’t understand if is one my problem or if the shield. The UART is configurate with interrupt and i configure the rx in this way every time i receive one byte in the callback i save inside one buffer and outside the callback i check if i receive OK or ERROR. Some one know how to resolve this  problem ?

 

Thank You 

 

Sergio 

[Andrew Neil]

Welcome to the forum

Please see How to write your question to maximize your chances to find a solution for best results.

 

What board is the STM32 on?

Please give a link to the shield you are using. Is it a 3V shield?

 

Before adding the complications of doing this on a microcontroller, does it work as expected when you do this manually using a terminal ?

 

Do you get an OK response to the ATE0 command ?

 

Tips on debugging serial comms.

[SGian.1]

Thank you for your advice. This is the linkat the shield https://wiki.dfrobot.com/tel0124/#docs , about the board i  made my board is not commercial board . the board work at 5V, 

Before adding the complications of doing this on a microcontroller, does it work as expected when you do this manually using a terminal ? YEP

Do you get an OK response to the ATE0 command ?YEP

[Andrew Neil]

the board i  made my board is not commercial board 

Then you’ll need to post the schematic.

the board work at 5V

I hope not!

The maximum working voltage for an STM32G071 is 3.6V; the absolute maximum is 4V

 

does it work as expected when you do this manually using a terminal ? YEP

Please show an example

 

 i send AT\r\n i receive back AT\r\n\r\nok\r\n

How, exactly, do you observe that?

Please post an example.

 

BTW: note that you don’t need to send the \n at the end of an AT command - just \r should be sufficient as a command terminator