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Use nrf9160 as cellular modem with vanilla Zephyr

epneosb

Hi,

we are using the nrf9160 on an addon-pcb as serial LTE-M/NB-IoT modem for our gateway. The host controller is running vanilla Zephyr.

Can someone tell me if I'm wrong or maybe how I can use an AT modem in Zephyr without developing a driver for it?

Is there perhaps a Zephyr driver for the AT modem example for the nrf9160?

Greetings
Sebastian




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    I probably already know the answer to my question. :-D But in case anyone else has a similar question, I'm going to write down my analysis here anyway. A confirmation would be nice, of course. Many thanks to Bjarki Arge Andreasen, who helped me a lot.

    As far as I understand, the old 'gsm_ppp' driver has been replaced by the 'modem_cellular' driver. This implements the current standard of 3gpp AT commands, PPP and CMUX. The 'nrf91-slm' driver is actually the 'modem_cellular' driver, and the Nordic Serial LTE firmware also implements exactly this interface, which is probably why the driver is also called 'nrf91-slm'. :-)

    The modem subsystem is in turn used by the modem_cellular driver or modem drivers in general.

    So if you end up using an nrf9160 as a standalone modem, you can use the Nordic Serial LTE modem firmware and then control it with the 'nrf91-slm' driver with a Zephyr running on the host controller.

    Greetings
    Sebastian

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  • 0

    I probably already know the answer to my question. :-D But in case anyone else has a similar question, I'm going to write down my analysis here anyway. A confirmation would be nice, of course. Many thanks to Bjarki Arge Andreasen, who helped me a lot.

    As far as I understand, the old 'gsm_ppp' driver has been replaced by the 'modem_cellular' driver. This implements the current standard of 3gpp AT commands, PPP and CMUX. The 'nrf91-slm' driver is actually the 'modem_cellular' driver, and the Nordic Serial LTE firmware also implements exactly this interface, which is probably why the driver is also called 'nrf91-slm'. :-)

    The modem subsystem is in turn used by the modem_cellular driver or modem drivers in general.

    So if you end up using an nrf9160 as a standalone modem, you can use the Nordic Serial LTE modem firmware and then control it with the 'nrf91-slm' driver with a Zephyr running on the host controller.

    Greetings
    Sebastian

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