nixfilter-mqtt/mqtt_subscribe.js

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

#!/usr/bin/env node

'use strict';
var nixfilter, utils;

// 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: 'Subscribe to a MQTT topic and output messages published to the topic',
  input_reader: null,
  add_arguments: function(argument_parser) {
    utils.add_common_arguments(argument_parser);
    argument_parser.addArgument(['subscribe_topic'], {
      help: 'The MQTT topic to subscribe to'
    });
  },
  setup: function(args) {
    return utils.connect_to_mqtt_broker(args).then((mqtt_client) => {
      this.mqtt_client = mqtt_client;
      this.mqtt_client.on('message', (topic, message) => {
        return this.output(message);
      });
      return this.mqtt_client.subscribe(args.subscribe_topic);
    });
  },
  terminate: function() {
    return utils.disconnect_from_mqtt_broker(this.mqtt_client);
  }
});

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