Wit.ai Control an LED by a MQTT Channel in Cayenne Server

Hi everyone! For the help request of someone who contacted me via Twitter, I decided to do this base project in which wit.ai is used to access the Cayenne MQTT server.

The project is a basic switcher that controls a channel on the Cayenne server.

1. Create a New Project in wit.ai

https://wit.ai/laurenceHR/Cayenne5

2. Create history for 'switch on'

3. Create history for 'switch off'

4. Copy the wit.ai token

5. Create Project in Node.js

npm install node-wit
npm install cayenne-mqtt

https://gist.github.com/laurenceHR/3ec0c44a2adbe0e8d9dd69cd5e48c504

'use strict';
const Wit = require('node-wit').Wit;
const interactive = require('node-wit').interactive;
const Cayenne = require('cayenne-mqtt');
const accessToken = 'QRV6QVSA6L...';
var cayenne_options = {
 'clientId' : 'c1d7df70...',
 'username' : 'f671f020...',
 'password' : '6c7dbdfd...',
 'debug': true
}
var Client = new Cayenne.Client(cayenne_options);
Client.connect();
var Ch4 = Client.Channel('4');
// Quickstart example
// See https://wit.ai/ar7hur/quickstart
const firstEntityValue = (entities, entity) => {
 const val = entities && entities[entity] &&
   Array.isArray(entities[entity]) &&
   entities[entity].length > 0 &&
   entities[entity][0].value
 ;
 if (!val) {
   return null;
 }
 return typeof val === 'object' ? val.value : val;
};
const actions = {
 send(request, response) {
   const {sessionId, context, entities} = request;
   const {text, quickreplies} = response;
   console.log('sending...', JSON.stringify(response));
 },
 turn({context, entities}) {
   //console.log('context'); console.log(context);
   //console.log('entities'); console.log(entities);
   var v = firstEntityValue(entities, 'on_off');
   console.log('value: ' + v);
   if(v == 'on'){
     Ch4.switchOn();
   }
   if(v == 'off'){
     Ch4.switchOff();
   }
   return context;
 },
};
const client = new Wit({accessToken, actions});
interactive(client);

6. Run the project

7. See that in action! (focus in Ch4)

I like interacting with IA interfaces. For one of the following projects, I will make a skill for Amazon Alexa which interacts with the Cayenne Server.

Stay tuned!