nRF9160 AT commands for SFTP - looking for example code

[hmolesworth]

We are porting to an nRF9160 dev kit with LTE-M our existing ethernet device which sends data to Amazon Web Services (AWS) using sftp from a Python script. We would like to find an example or link to Git code to speed this development effort up, not using Python but preferably AT commands which can be embedded in c code or sent from the on-board nRF52840 to the nRF9160 via the serial port.
Would Nordic any anyone else kindly provide us with some assistance? I don't see specific sftp examples anywhere for this cellular modem, though I see the SFTP listed in one of the enum definitions.
Segger Embedded Studio v4.14, off-the-shelf nRF9160 DK

[Martin Lesund]

Hi Hugh,

We have a lot of "un-official" examples that are in this repository which can give you a great starting point on how you can solve this.

I think the ftp example can be interesting for you as a reference.

I am wondering if you can run the application on the nrf91 itself, or do you need to run it on the nrf52840 and send the data to the nrf91?

//cheers

[hmolesworth]

Good suggestion, thanks. I'd already looked at the nRF52 trees on Rallare but when I saw no changes on diff'ing with 15.2.0 I didn't look further. We will try with some sftp c code we have and see how it goes; will post results.

The incoming BLE data for transfer will be both stored in the Flash and sent over LTE-M, but the application can run on the nRF91 .. one hopes that will be more power-efficient.

[miked531]

This sounds very similar to what I need to do (though it may ultimately end up being ZigBee instead of BLE). I've got a decent understanding of the nRF91 side of things and am just now starting to look at what I need to do on the nRF52. Can you share any pointers on how the pieces fit together? Things that are a mystery to me include: do I use zephyr on the nRF52? how do the 2 chips exchange data (uart? SPI?)? Bonus points for sample code!

[Martin Lesund]

Hi Mike,

You could for example do as we have done in our LTE_Sensor_Gateway sample where we have the nRF52840 on the nRF91 DK running the HCI_UART sample and the nRF91 itself running the LTE_Sensor_Gateway sample.

If you are making a custom board it is recommended to connect the COEX pins from the nRF91 as well as how many GPIOs you need for your data transfer. (SPI/UART..)

If you take at the schematics for the nRF91 DK you can see that we have connected the COEX signals as well as 6 GPIOs to give the user some flexibility.

//cheers