Coiote LwM2M JSON encoding to nRF Asset Tracker LwM2M JSON encoding 
Convert the LwM2M JSON encoding written by AVSystem's Coiote Azure integration to nRF Asset Tracker's LwM2M JSON encoding.
AssetTrackerv2 firmware to LwM2M Asset Tracker v2 through Coiote-Azure objects version mapping
| Name | AssetTrackerv2 Firmware | Coiote-Azure | LwM2M Asset Tracker v2 |
|---|---|---|---|
| Device | 3:1.2@1.1 | 3:1.2@1.1 | 3:1.2@1.1 |
| Connectivity Monitoring | 4:1.3@1.1 | 4:1.3@1.1 | 4:1.3@1.1 |
| Location | 6 | 6 | 6 |
| Temperature | 3303:1.1 | 3303 | 3303:1.1 |
| Humidity | 3304:1.1 | 3304 | 3304:1.1 |
| Pressure | 3323:1.1 | 3323 | 3323:1.1 |
| Config | 50009 | 50009 | 50009 |
Where ":" indicates the object version and "@" indicates the LwM2M
version. if not present, values will be the default option. Default LwM2M
version is 1.0. Default object version is 1.0.
Installation
npm install --save-exact
Running the tests
After cloning the repository:
npm ci
npm test
Example usage
import { converter } from './converter.js'
const deviceTwin = {} // ... full device twin
const result = await converter(deviceTwin)
console.log(result)See ./src/example.ts for more details.
Expected input
Result of the integration between Coiote and Azure.
{
"deviceId": "urn:imei:000000000000008",
"etag": "AAAAAAAAAAE=",
"deviceEtag": "MTMwNTk1MzI2",
"status": "enabled",
"statusUpdateTime": "0001-01-01T00:00:00Z",
"connectionState": "Connected",
"lastActivityTime": "0001-01-01T00:00:00Z",
"cloudToDeviceMessageCount": 0,
"authenticationType": "sas",
"x509Thumbprint": {
"primaryThumbprint": null,
"secondaryThumbprint": null
},
"modelId": "",
"version": 7,
"properties": {
"desired": {
"$metadata": {
"$lastUpdated": "2023-07-05T14:35:14.759071Z"
},
"$version": 1
},
"reported": {
"lwm2m": {
"3": {
"0": {
"0": {
"value": "Nordic Semiconductor ASA"
},
"1": {
"value": "Thingy:91"
},
"2": {
"value": "351358815340515"
},
"3": {
"value": "22.8.1+0"
},
"7": {
"0": {
"value": 80
},
"attributes": {
"dim": "1"
}
},
"11": {
"0": {
"value": 0
},
"attributes": {
"dim": "1"
}
},
"13": {
"value": 1675874731
},
"16": {
"value": "UQ"
},
"19": {
"value": "3.2.1"
}
}
},
"4": {
"0": {
"0": {
"value": 6
},
"1": {
"0": {
"value": 6
},
"1": {
"value": 7
},
"attributes": {
"dim": "2"
}
},
"2": {
"value": -85
},
"3": {
"value": 23
},
"4": {
"0": {
"value": "10.160.120.155"
},
"attributes": {
"dim": "1"
}
},
"8": {
"value": 34237196
},
"9": {
"value": 2
},
"10": {
"value": 242
},
"12": {
"value": 12
}
},
"attributes": {}
},
"6": {
"0": {
"0": { "value": -43.5723 },
"1": { "value": 153.2176 },
"2": { "value": 2 },
"3": { "value": 24.798573 },
"5": { "value": 1665149633 },
"6": { "value": 5 }
}
},
"3303": {
"0": {
"5700": {
"value": 15
}
}
},
"3304": {
"0": {
"5700": {
"value": 30
}
}
},
"3323": {
"0": {
"5601": {
"value": 101697
},
"5602": {
"value": 101705
},
"5700": {
"value": 10
},
"5701": {
"value": "Pa"
}
}
},
"50009": {
"0": {
"0": {
"value": true
},
"2": {
"value": 120
},
"3": {
"value": 600
},
"4": {
"value": 7200
},
"1": {
"value": 60
},
"5": {
"value": 8.5
},
"6": {
"value": true
},
"7": {
"value": true
},
"8": {
"value": 2.5
},
"9": {
"value": 0.5
}
}
}
},
"$metadata": {
"lwm2m": {}
}
},
"$version": 6
},
"capabilities": {
"iotEdge": false
}
}full device twin object here: ./src/deviceTwinExample.json
Expected output
export const output = {
"6": {
"0": -43.5723,
"1": 153.2176,
"2": 2,
"3": 24.798573,
"5": 1665149633,
"6": 5,
},
"50009": {
"0": true,
"1": 60,
"2": 120,
"3": 600,
"4": 7200,
"5": 8.5,
"6": true,
"7": true,
"8": 2.5,
"9": 0.5,
},
"3:1.2@1.1": {
"0": "Nordic Semiconductor ASA",
"1": "Thingy:91",
"2": "351358815340515",
"3": "22.8.1+0",
"7": [80],
"11": [0],
"13": 1675874731,
"16": "UQ",
"19": "3.2.1",
},
"4:1.3@1.1": {
"0": 6,
"1": [6, 7],
"2": -85,
"3": 23,
"4": ["10.160.120.155"],
"8": 34237196,
"9": 2,
"10": 242,
"12": 12,
},
"3303:1.1": [{ "5518": 1692369551, "5700": 15 }],
"3304:1.1": [{ "5518": 1692369551, "5700": 30 }],
"3323:1.1": [
{
"5518": 1692369551,
"5601": 101697,
"5602": 101705,
"5700": 10,
"5701": "Pa",
},
],
};Architecture decision records (ADRs)
See ./adr.