smithtek-nodered/smithtek/smithtek_out.js

NodeRED node to post data on SmithTek using MQTT.

module.exports = function (RED) {
    var mqtt = require('mqtt');
    var fs = require('fs');
    var path = require('path');
  
    function SmithTekNode(config) {
      RED.nodes.createNode(this, config);
      var self = this;
      var ENDPOINT_URLS = {
        business: 'industrial.api.ubidots.com',
      };
      var useTLS = config.tls_checkbox;
      var isSimpleNode = config.simple_node_checkbox;
      var URL_PREFIX = 'mqtt://';
      
      var port = 1883;
      var portTLS = 8883;
      var certificate = fs.readFileSync(
        path.join(__dirname, '../keys/certificate.pem'),
        'utf8',
        function () {}
      );
  
      var endpointUrl = ENDPOINT_URLS.business;
      var token = config.token;
      var client = mqtt.connect(URL_PREFIX + endpointUrl, {
        username: token,
        password: '',
        port: useTLS ? portTLS : port,
        cert: useTLS ? certificate : undefined,
        protocol: useTLS ? 'mqtts' : 'mqtt'
      });
  
      client.on('reconnect', function () {
        self.status({
          fill: 'yellow',
          shape: 'ring',
          text: 'Disconnected'
        });
      });
  
      client.on('connect', function (connack) {
        console.log('SmithTek Publisher connected');
        self.status({ fill: 'green', shape: 'dot', text: 'Connected' });
      });
      client.on('disconnect', function (packet) {
        console.log('SmithTek Publisher disconnected');
        self.status({ fill: 'red', shape: 'ring', text: 'Disconnected' });
      });
  
      client.on('error', function (msg) {
        console.warn('SmithTek Publisher: Inside error function, msg: ', msg);
        self.status({
          fill: 'red',
          shape: 'ring',
          text: 'Disconnected'
        });
      });
  
      self.on('input', function (msg, send, done) {
        let values;
        //In case the msg contains a property named'device_label'
        //it will be taken as device_label, otherwise it takes it from the device_label field
        let device_label = msg.payload.device_label || config.device_label;
        if (device_label === undefined || device_label === '') {
          console.error(
            "Device_Label is not defined. The device_label field is probably empty or you didn't include the key 'device_label' in your JSON."
            );
          } else {
            if (msg.payload.device_label) {
              delete msg.payload.device_label;
            }
            if (isSimpleNode) {
              var variable_label = config.variable_label;
              let simpleNodeOutput = {};
              simpleNodeOutput[variable_label] = { "value": msg.payload }; 
              values = msg.payload === null ? {} : simpleNodeOutput; 
            } else {
            values =
              typeof msg.payload !== 'object' || msg.payload === null
                ? {}
                : msg.payload;
          }
          if (typeof values === 'object') {
            values = JSON.stringify(values);
          }
          try {
            client.publish(
              '/v1.6/devices/' + device_label,
              values,
              { qos: 1, retain: false },
              function () {
                console.log('SmithTek Published successfully,');
              }
            );
          } catch (e) {
            console.log('Published failed: ', e);
          }
        }
        if (done) {
          done();
        }
      });
    }
  
    RED.nodes.registerType('smithtek_out', SmithTekNode);
  };