nRF9160 AT driver

[Zoptune]

Hello,

I am using the nRF9160 on a custom board as the main MCU and an ESP32 as Wifi/BLE MCU.

On the ESP32 I am using the esp-at firmware to expose AT commands to configure and control Wifi and BLE.

On the nRF9160 side I am searching for an AT driver to send commands, read results and URCs.

Is there any existing driver or library in the nRF Connect SDK or Zephyr ?

I saw that the AT interface in used to communicate with the internal modem, is it possible to use it in my case to also communicate with the ESP32 ?

Regards 

[langestefann]

Hi. I don't know of any AT command driver, but you could copy some of the work done by Nordic here: developer.nordicsemi.com/.../README.html

I have used the ESP AT firmware and found it extremely unstable and unreliable. However, this was a few years ago so maybe it has improved. Would it be an option to use HCI? https://docs.espressif.com/projects/esp-idf/en/v4.2.3/esp32/api-reference/bluetooth/controller_vhci.html And see: docs.zephyrproject.org/.../hci_drivers.html

I'm not sure if it supports wifi though. 

[Zoptune]

Hi langestefann and thanks for your reply :)

I looked at the AT client but unfortunately it only forwards AT commands from an UART to the modem.
I also started to look at the HCI possibility but I don't think it works with Wifi and for now I only have one UART line between the nRF9160 and the ESP32. I also need to add custom commands so the at-slave if the best choice for now.

Thanks :)

[langestefann]

Yes, but you could remove the modem part and just use the AT command client as a starting point for your application. In the end for the AT client interface it doesn't matter if you talk to a modem or an ESP32.