Connect nRF52832 to CoAP IP using an LTE module.

[Bakry]

Good morning,

I am using SDK 16.0.0 and nRF52832 uC. I have a project where I need to connect the uC to a CoAP IP. The only internet access it has is through an SoC developed by U-BLOX called SARA-R410M-02B which has an LTE unit embedded in our board. Is there a possibility to use CoAP supported libraries in this SDK and configure it to use it with our modem?

Thanks in advance.

[Heidi]

Hi!

I recommend using the nRF Connect SDK (NCS) where Zephyr provides a CoAP library where the users must create the sockets for communication. This is a good solution for your setup, where you have an MCU and a separate modem. 

As long as you know how to deal with creating sockets on the U-Blox device from the nRF52832.

Best regards,

Heidi

[Bakry]

Hi,

Thanks for your answer. Yesterday I spent all day trying to compile CoAP example on nRF52832. However, I always get 'CONFIG_NET_CONFIG_IEEE802154_DEV_NAME' undeclared (first use in this function), any suggestions on how to fix that? Also, if you can bear with me, can you clarify much more how to use this library, or provide me a tutorial or an example to follow?

Thanks in advance.

[Heidi]

Hi! 

I will be on vacation next week so I will take a look at this case next Monday. 

[Heidi]

Which CoAP example are you trying to use?

The one available in NCS (nRF CoAP Client) uses the CoAP utils library in NCS which uses the BSD socket API and therefore will not work on the nRF52 devices alone, only the nRF9160. To use the CoAP utils library on nRF52 devices, you will need some external device that implements BSD sockets, such as the U-Blox modem.

Zephyr has the CoAP client and CoAP Server sample, both of which I am able to build for the nrf52dk_nrf52832 board.

[Bakry]

Thanks for your answer, I am one step closer now. The CoAP client project is working now. The last thing left now, how can I use SARA-R410M-02B which has our LTE modem, to be used with such example?

Thanks in advance.

[Bakry]

One more thing, even though I am able to build a CoAP client project using the Zephyr platform, yet when I debug it on my boards, none of them works as expected at all. Any suggestion..