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nrf52840 Mesh Thread+ LTE module as a border router

Hi,

I am trying to make my own border router for Thread mesh network using nrf52840 and BG96. I have ordered pre-certified third party  modules. Now How can I interface it to my LTE module. We have some ready LTE modules (BG96) which we are using in pother projects.

Using nRF52840 with Wifi/Ethernet it is easy but with GSM how can we do it? Any documents would be really helpful.

Thanks,

Naveen

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  • Naveen,

    One way to do this is to implement the Open Thread Border Router (OTBR), on a Raspberry Pi, as described in the Nordic SDK & examples.  Then replace the Ethernet cable with a PPP cellular connection using the Quectel BG96.  Quectel has a pretty good set of documentation for using PPP on a Linux platform.  It'll run fine on CAT-M1, but keeping a persistent PPP connection open over NB-IoT is probably not viable in the long term due to carrier restrictions.

    I'm sure there is a much more elegant approach where you run the Border Router functionality on the BG96's application processor, but that's a much bigger software project.

    -Rob

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  • Naveen,

    One way to do this is to implement the Open Thread Border Router (OTBR), on a Raspberry Pi, as described in the Nordic SDK & examples.  Then replace the Ethernet cable with a PPP cellular connection using the Quectel BG96.  Quectel has a pretty good set of documentation for using PPP on a Linux platform.  It'll run fine on CAT-M1, but keeping a persistent PPP connection open over NB-IoT is probably not viable in the long term due to carrier restrictions.

    I'm sure there is a much more elegant approach where you run the Border Router functionality on the BG96's application processor, but that's a much bigger software project.

    -Rob

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