UART connection on RPi 3B+

[TTimTT]

Hello,

First of all, thank you very much for all this work, it is really helping! I have unfortunately an issue when I try to use the Shield with Raspbian on RPI 3B+ using the UART port only.

Everything works fine, I can use AT command, even Modem-Manager helps me to connect to my APN, but then I can not create an interface with Network-Manager, it timeouts.

By the way, everything works fine when using the USB, it looks like it is related to the UART? EDIT: I forgot to say, I updated to the last firmware, otherwise ModemManager could not make it work, so my problem is more ore less related to NetworkManager also

I have read some previous issues and I know you are not a "Linux guy", so I was hoping you could redirect me to someone who might know.

Thank you very much for your help!

[bliteknight]

is UART your only option? You can get a network connection via USB which in my case is more reliable and gives you more options to send data.

[TTimTT]

Yes USB is great I agree. Unfortunately I must use UART, we designed our PCB that way.

[wille-io]

@TTimTT Did you manage to get it working? If so, how? Thank you.

[TTimTT]

@wille-io Hey, well in the end we used the USB connection, we never managed to make the UART work properly, I would highly recommend also using the USB.

In our case, we fix this by using 2 wires and connect them from the RPi USB pad directly to the SIM700-LTE USB pads.

Hope it helps,