Chirpstack v4 Downlink HTTP URL and JSON Format

ChirpStack (v4)
1

Hi I’m using HTTP integration with my application, and I am getting the uplink data from the LNS.

However, I’m not able to send downlinks to my devices. I’m initially testing using postman. Below are the details:

URL : http://LNS_IP_HERE:8080/api/devices/DevEUI_HERE/queue
Headers: ‘Authorization’ : ‘API_KEY_HERE’
Body:

{
    "deviceQueueItem": {
        "dev_eui": "*DevEUI_HERE*",
        "confirmed": false,
        "data": "AQID",
        "fPort": 11
    }
}

I’m getting 400 Bad Request error for the above.

Note : I have installed the LNS locally but application is running on cloud.

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2

In your post you mention both dev_eui and devEui… The best way to start is to use the Swagger UI web-interface of the ChirpStack REST API, there you will find the JSON structure that you must use for each API endpoint.