API flow for new OTAA devices

ChirpStack Application Server
1

Hey folks,

I’m trying to work out the flow of data when creating a new OTAA device via the API.

So far, it seems to be that I should call GET /devices to confirm that the device name/devEui is unique, then POST /devices to create the device.

I then need to add the AppKey for that particular device, so should I be calling POST /devices/<DEV EUI>/keys?

I’ve got a Python script that should do this, however it fails at the final step saying that it can’t find the device, even though the GET /devices shows the device as existing.

2

If it’s a one time thing, I don’t think there’s any need to list the devices before trying to create it as you’ll get a very explicit error from your POST request:

{error: "object already exists", message: "object already exists", code: 6, details: []}

That said, I can see it being useful to fetch all taken EUIs and have them available for checks before trying to create if you are generating random EUIs, creating a lot of the devices or something like that.

The flow you describe is correct,so I’m guessing maybe you tried to set the keys before the device creation was done? I just tested this and it works:

POST to /api/devices with:

{device: {
	applicationID: "2"
	description: "Testing device 0"
	devEUI: "0101010101010100"
	deviceProfileID: "c659e2a9-7220-4414-8a64-4f02d67bbe92"
	name: "test0"
	}
}

After getting an empty response, which means everything went ok:

POST to /api/devices/0101010101010100/keys with:

{deviceKeys: {nwkKey: "01010101010101000101010101010100", devEUI: "0101010101010100"}}

And that’s it.

3

Thanks, I thought that was what my code was doing, but perhaps it’s not.

I’ll check it later…

4

I was sending the wrong values when creating the keys.

nwkKey should be the Application Key and appKey should be 00000000000000000000000000000000

Working now, thanks.

5

Hi, is there any chance you could share that script with me ? I am trying to implement a very simillar solution but my knowledge on python and APIs is very limited and i don’t think i can make it from scratch