nRF9160 DK Azure IoT Hub

RE: nRF9160 DK Azure IoT Hub

Hakon — Thu, 23 Apr 2020 15:16:18 GMT

This looks like it could be a parsing issue. I'm not sure this can be solved by formatting differently on the client side, but it might be possible. You should make a separate ticket for this question.

RE: nRF9160 DK Azure IoT Hub

prolo_isaac — Wed, 22 Apr 2020 21:39:03 GMT

Thanks for the reply!

I've actually gotten the mqtt_simple example to connect to my IoT Hub now.

I've actually been dealing with a new, more specific problem with publishing data (device-to-cloud). I can publish data and see the event on our IoT Hub, but the IoT Hub is already configured to receive a json payload. I tried formatting the outgoing message into something more json-esque using line breaks and such, but when I see the message come in, it includes the escape character ('\') that I was trying to use for line breaks and quotation marks.

I have successfully recieved this d2c message:

{
    "event": {
        "origin": "{device-id}",
        "payload": "a"
    }
}

I want this:

{
    "event": {
        "origin": "{device-id}",
        "payload": {
            "published_at": "XXXX-XX-XXXXX:XX:XX.XXXX",
            "device_id": "{device-id}",
            "data": "0.710180:1.796526:48.254000:58.799999:988.430000",
            "event": "demo"
        }
    }
}

But I am getting this:

{
    "event": {
        "origin": "{device-id}",
        "payload": "{\n\"published_at\": \"XXXX-XX-XXXXX:XX:XX.XXXX\",\n\"device_id\": \"{device-id}\"\n,\"data\":\"0.710180:1.796526:48.254000:58.799999:988.430000\",\n\"event\": \"demo"
    }
}

Do you know what my options would be for formatting my message going into the mqtt_publish_param in mqtt.h? I feel like my hands are tied since the program is configured to send messages composed as type 'u8_t*'.

Let me know if I should make a separate ticket for the new question.

RE: nRF9160 DK Azure IoT Hub

Hakon — Wed, 22 Apr 2020 10:56:59 GMT

Hello,

I don't have much experience working with Azure, but in principle it should be similar to other cloud backends. I assume you have configured some sort of endpoint on Azure with an URL or ip address that you want to connect to. You should change MQTT_BROKER_HOSTNAME in Kconfig to match the hostname of your Azure endpoint. You probably also need to configure the mqtt_simple project to use TLS connection, and provision certificates from Azure to the device. If you're unsure how to do that, let me know so I can guide you.

You should also read the Microsoft Azure documentation on how to communicate with devices over mqtt.

I hope this was helpful, and ask if you have more questions.