nixfilter-mqtt/mqtt_publish.coffee

Filters for publishing and subscribing to MQTT topics, similar to "mosquitto_pub" and "mosquitto_sub"

`#!/usr/bin/env node

'use strict'`

# Require the "nixfilter" module
nixfilter = require('nixfilter')

# Require the "./utils" module
utils = require('./utils')

# Define the filter and register it on the module
nixfilter.filter module,
	description: 'Publish messages to a MQTT topic'

	output_writer: null

	add_arguments: (argument_parser) ->
		utils.add_common_arguments(argument_parser)
		argument_parser.addArgument ['--retain', '-r'],
			action: 'storeTrue'
			help: 'Send messages as "retained" messages'
		argument_parser.addArgument ['publish_topic'],
			help: 'The MQTT topic to publish to'
		return

	setup: (args) ->
		utils.connect_to_mqtt_broker(args)
		.then (@mqtt_client) =>

	on_input: (message) ->
		@mqtt_client.publish @args.publish_topic, message,
			qos: @args.qos
			retain: @args.retain
		return

	terminate: ->
		utils.disconnect_from_mqtt_broker(@mqtt_client)