NRF52840 + OpenThread + Azure IoT Hub / MQTT Sample

[SebastianCorin]

Hi!

I am looking for a NRF52840+OpenThread+Azure IoT Hub SDK solution. Here is what I did so far. Nothing helped:

1. Thead CLI Example on NRF52840 + Border Router on PI with RCP NRF52840 is working. I can ping ipv6 in mesh and outside mesh. I can ping ipv4 outside mesh
2. I merged the code of nRF9160: Azure IoT Hub — nRF Connect SDK 2.2.99 documentation (nordicsemi.com) into the Thread CLI example, created and added certificates and ended up with:

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*** Booting Zephyr OS build v3.2.99-ncs1 ***

Azure IoT Hub sample started

Azure IoT Hub library initialized

AZURE_IOT_HUB_EVT_CONNECTING

E: getaddrinfo() failed, error -11

E: mqtt_helper_connect failed, error: 11

Connection request sent to IoT Hub

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*** Booting Zephyr OS build v3.2.99-ncs1 ***
Azure IoT Hub sample started
Azure IoT Hub library initialized
AZURE_IOT_HUB_EVT_CONNECTING
E: getaddrinfo() failed, error -11
E: mqtt_helper_connect failed, error: 11
Connection request sent to IoT Hub

I am aware of the following tickets but nothing what was described helped. There is no complete description included:

• (+) Azure IoT Hub Library with OpenThread - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)
• (+) Error -22 in mqtt_connect() - nRF52840dk with Azure IoT Hub using OpenThread and TCP - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

My ask is a working sample with Azure IoT Hub and Openthread / MQTT and Openthread.

I added my github repo to make the code available for testing: sebastianspross/nrf52840_ot_azure (github.com)

Really appriciate your help!

Thanks

Sebastian

[SebastianCorin]

I am still trying to find a solution. Currently I am working on the zephyr Azure MQTT sample. I run there in the same problem. The dns resolve of the ipv4 of the Azure IoT Hub fails. I found the following commit which enables resolve4 which looks promising: [dns-client] add support for NAT64 during address resolution by abtink · Pull Request #6414 · openthread/openthread (github.com)

But how can I set 

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OPENTHREAD_CONFIG_DNS_CLIENT_NAT64_ENABLE=y

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OPENTHREAD_CONFIG_DNS_CLIENT_NAT64_ENABLE=y

?

*edit: I ported the Azure MQTT sample from zephyr into the openthread cli sample from nrfconnect

[Susheel Nuguru]

OPENTHREAD_CONFIG_DNS_CLIENT_NAT64_ENABLE=y should be default set to y when CONFIG_OPENTHREAD_DNS_CLIENT is enabled. If this is not the case, then there seems to be some conflicts in your project configuration and the build system should have some warning when compiling. If that is not the case, then I can report this issue to the developers.

[SebastianCorin]

Thanks. How did you derive the name of CONFIG_OPENTHREAD_DNS_CLIENT?

I tried. This time resolve4 is known but I get a timeout when I call

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ot dns resolve4 google.com

DNS response for google.com.-

Error 28: ResponseTimeout

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ot dns resolve4 google.com
DNS response for google.com.-
Error 28: ResponseTimeout

[Susheel Nuguru]

I am sorry for delays Sebastian, I did not manage to get in contact with the team, I will try to do so tomorrow. Thanks a lot for your patience.

[Susheel Nuguru]

most of the OT features are enabled from Zephyr from this CMake file

as for the DNS4 test, I guess more information is needed about the setup and logs. Is there a properly configured and connected border router in the Thread network? are there some Wireshark files to know what's going on with that DNS packet?