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I need to configure the TRM240 Modem on a Linux host running Raspbian OS. How can I do that? I referred to the Wiki, but I couldn't find any information on how to do that. 
Thanks in advance.

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Hello, 

I think this question was answered in this forum thread

Please check if this is what you need.

Best regards,
VidasKac.

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Thank you very much. As I mentioned here (https://community.teltonika-networks.com/15110/where-can-i-find-the-linux-drivers-for-tmr240), the procedure seems not to work properly...
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Sorry for long silence, but we were trying to recreate the issue, with different devices, and on couple ones there was problem with native network manager.

what you can try is:

First of all you will have to disable raspbian default network manager with command:

  1. systemctl stop networking.service
  2. systemctl disable networking.service - this will prevent default network manager from starting again automatically

And for some reasons default raspbian dhcp service do not work properly with modems, so you will have to use udhcpc.

  1. install udhcpc sudo apt install udhcpc
  2. request ip address with udhcpc -i wwan0

With these two changes you will have to get internet connection via mobile interface.

Hope this helps.