How to connect to EM7455 Cellular Modem from ubuntu server

IoT Modules MC/EM Series
1

How to connect to EM7455 Cellular Modem from a Ubuntu server. I can’t use putty as it is a server machine. Any suggestions ?

2

If you are trying to start a data session, you can use qmicli or MBPL lite-qmi-connection-manager Mobile Broadband Package for Linux (SDK, Drivers, Documentation).

If that’s not what you are looking for, can you please explain a bit more about what you are trying to do. Thanks.

3

I have one OnLogic device ( ubuntu server) and an EM7455 modem is installed in it. I am trying to configure the modem with AT commands. I was not able to connect using putty as it doesn’t have a GUI. But I found I can use minicom to use for that. However, after sudo minicom -s, and connecting to /dev/ttyUSB2, I am getting response to a few commands like ate1. but when I tried AT!CUSTOM=”UIM2ENABLE”,0 it does not output anything and hangs/ I can exit from minicom.

4

Please disable and remove modemmanager. It can hold on to the AT port and cause issues.

Does AT!CUSTOM? provide a response? If yes, try executing AT!ENTERCND=“A710” first and then AT!CUSTOM=“UIM2ENABLE”,0. In the AT guide, commands they require a password will be noted as “Password required: Yes”

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5

Yeah, that went well. However, the commands mentioned in onlogic manual (https://static.onlogic.com/resources/manuals/onlogic-nwk200-product-manual-120418.pdf)are with modemmanager. I am not sure how to check the status, configure apn and SIM status using minicom or do I need to install modem manager again to configure this ? If you have any guide on using mimicom to configure em7455, then that would be ideal.

6

Hi

Over minicom, you would send AT commands. You can refer the modem’s AT guide for all the AT commands that you can send to the modem. AirPrime EM74xx-MC74xx AT Command Reference

If you are trying to start a data session use the lite-qmi-connection-manager from MBPL: Mobile Broadband Package for Linux (SDK, Drivers, Documentation)

Refer Software_Integration_and_Development_Guide_for_Linux_USB_Platforms_R18.pdf from the MBPL link.

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7

I have been reading on the "qmicli or MBPL lite-qmi-connection-manager [Mobile Broadband Package for Linux] document and it appears these libraries are only for C code. Are there python packages for Debian? I am currently using the Gobi drivers and I think these drivers are outdated. Although they work, I am looking for some libraries that do more of the work soI don’t have to manage so much code.

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