thingsboard-telemetry-stream's Introduction

thingsboard-telemetry-stream

Fetch data from the Thingsboard telemetry WebSocket API.

Installation

npm install thingsboard-telemetry-stream

Usage

const {connect} = require('thingsboard-telemetry-stream')

const connection = await connect({
	token: '<API token here>',
})
connection.addEventListener('error', abortWithError)

If you pass in token or set the THINGSBOARD_TOKEN environment variable, only this token will be used. To let it periodically generate new token instead, pass in user & password or set the THINGSBOARD_USER & THINGSBOARD_PASSWORD environment variables.

subscribing to devices' telemetry data

const {fetchDevices, subscribeToTimeseries} = require('.')

const deviceGroupId = '780c1435-cac2-4be7-8d85-0961239e02e4'

const devices = await fetchDevices(connection, deviceGroupId)
const deviceIds = devices.map(d => d.entityId.id)
const sub = await subscribeToTimeseries(connection, deviceIds)

// all devices's telemetry
sub.on('data', (deviceId, data) => console.log(deviceId, data))
// a single device's telemetry
sub.on('338e9c33-988f-4314-9e46-cb8c94236942:data', (data) => console.log(data))

sending commands manually

const {sendCommands, getCommandId} = require('.')

const res = await sendCommands(connection, {
	entityDataCmds: [{
		cmdId: getCommandId(connection),
		query: {
			entityFilter: {
				type: 'entityGroup',
				groupType: 'DEVICE',
				entityGroup: '780c1435-cac2-4be7-8d85-0961239e02e4',
			},
			pageLink: {pageSize: 10},
		},
	}],
})
console.log(res.entityDataCmds[0])

{
	data: [
		{
			entityId: {
				entityType: 'DEVICE',
				id: '338e9c33-988f-4314-9e46-cb8c94236942'
			},
			readAttrs: true, readTs: true,
			latest: {}, timeseries: {},
		},
		{
			entityId: {
				entityType: 'DEVICE',
				id: 'cf59aeaa-7a09-457a-bd04-4f3a2596b960'
			},
			readAttrs: true, readTs: true,
			latest: {}, timeseries: {},
		},
	],
	totalPages: 1,
	totalElements: 2,
	hasNext: false,
}

Contributing

If you have a question or need support using thingsboard-telemetry-stream, please double-check your code and setup first. If you think you have found a bug or want to propose a feature, use the issues page.

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