Hello STM32 forum members, I'm currently working on a project where I need to interface an STM32F4 microcontroller with a SIM900 module to send TCP/IP data to a server. I was wondering if anyone here has experience with this kind of setup and could share

fchai.1 · ‎2023-04-05

KDJEM.1 · ‎2023-04-06

Hello @fchai.1 ,

Try to get inspired from the available LwIP_TCP_Echo_Server example to configurate your project.

Also, for more explanation about TCP/IP, I recommend you the UM1713 Developing applications on STM32Cube with LwIP TCP/IP stack and precisely Example of TCP echo server demonstration Section.

This section can help you to Read a received packet from the Ethernet buffers and send it to the lwIP for handling.

I hope this help you!

Thank you.

Kaouthar

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JMarq.1 · ‎2023-05-15

Hello @fchai.1

I believe you are looking for a UART serial interface where to send AT commands instead of using a TCP/IP stack like LwIP.

See the following document as an starting point:

https://www.espruino.com/datasheets/SIM900_AT.pdf

I hope it helps.