Switch TV On and Off with Alexa and Photon

{
  "intents": [
    {
      "intent": "SwitchOnIntent"
    },
    {
      "intent": "SwitchOffIntent"
    },
    {
      "intent": "AMAZON.HelpIntent"
    },
    {
      "intent": "AMAZON.StopIntent"
    },
    {
      "intent": "AMAZON.CancelIntent"
    }
  ]
}

SwitchOnIntent switch t v on
SwitchOnIntent switch television on
SwitchOnIntent switch t v set on
SwitchOnIntent on
SwitchOffIntent switch t v off
SwitchOffIntent switch television off
SwitchOffIntent switch t v set off
SwitchOffIntent off

'use strict';
const Alexa = require('alexa-sdk');
const p = require('./particle.js');

const languageString = {
    "en-US": {
        "translation": {
            "WELCOME_MESSAGE": "t v remote is ready. ",
            "STOP_MESSAGE": "Stopped. ",
            "ON_MESSAGE": "I switch the t v on for you. ",
            "OFF_MESSAGE": "I switch the t v off for you. ",
            "HELP_MESSAGE": "Say: Switch on the t v or switch off the t v. ",
            "HELP_REPROMPT": "Say: Switch on the t v or switch off the t v. ",
            "ERROR_MESSAGE": "Something went wrong. "
        }
    },
     "en-GB": {
        "translation": {
            "WELCOME_MESSAGE": "t v remote is ready. ",
            "STOP_MESSAGE": "Stopped. ",
            "ON_MESSAGE": "I switch the t v on for you. ",
            "OFF_MESSAGE": "I switch the t v off for you. ",
            "HELP_MESSAGE": "Say: Switch on the t v or switch off the t v. ",
            "HELP_REPROMPT": "Say: Switch on the t v or switch off the t v. ",
            "ERROR_MESSAGE": "Something went wrong. "
        }
    },
    "de-DE": {
        "translation": {
            "WELCOME_MESSAGE": "Fernbedienung ist gestartet. ",
            "STOP_MESSAGE": "Beendet. ",
            "ON_MESSAGE": "Ich schalte den Fernseher für dich an. ",
            "OFF_MESSAGE": "Ich schalte den Fernseher für dich aus. ",
            "HELP_MESSAGE": "Sage: Schalte Fernseher an oder Schalte Fernseher aus. ",
            "HELP_REPROMPT": "Sage: Schalte Fernseher an oder Schalte Fernseher aus. ",
            "ERROR_MESSAGE": "Das hat leider nicht funktioniert. "
        }
    }
};

const password = process.env.PASSWORD;
const username = process.env.USERNAME;
const deviceid = process.env.DEVICEID;
const appid    = process.env.APPID;

exports.handler = function(event, context, callback) {
    var alexa = Alexa.handler(event, context);
    alexa.appId = appid;  
    alexa.resources = languageString;
    alexa.registerHandlers(handlers);
    alexa.execute();
};

const handlers = {
    'LaunchRequest': function () {
        const self = this; 
        p.particle_get_token(username,password).then(  
            access_token => {
                self.attributes["token"] = access_token;
                const speechOutput = self.t('WELCOME_MESSAGE');
                self.emit(':ask',speechOutput);
      
            },
            err => {
                console.log(`Fehler: ${err}`);
            }
        );
    },
    'SwitchOnIntent': function () {
        // function send is implemented in sendrawir.ino
        this.emit('Call','send',this.t('ON_MESSAGE')); 
    }      
    ,
    'SwitchOffIntent': function () {
        // function send is implemented in sendrawir.ino
        this.emit('Call','send',this.t('OFF_MESSAGE'));     
    },
    'Call': function(func,message) {
        const self = this; 
        if(this.attributes["token"]) {
            let access_token=this.attributes["token"];
            p.particle_function_call(access_token,deviceid,func).then( 
                body => {
                    const speechOutput = message; 
                    self.emit(':tell', speechOutput); 
                },
                err => {
                    console.log(`${err}`);
                    const speechOutput = this.t('ERROR_MESSAGE');
                    self.emit(':tell',speechOutput);
                }
            );
        }
        else {
           const speechOutput = this.t('ERROR_MESSAGE');
           self.emit(':tell',speechOutput); 
           // TODO: end here
        }

    },
    'AMAZON.HelpIntent': function () {
        const speechOutput = this.t('HELP_MESSAGE');
        const reprompt = this.t('HELP_MESSAGE');
        this.emit(':ask', speechOutput, reprompt);
    },
    'AMAZON.CancelIntent': function () {
        this.emit(':tell', this.t('STOP_MESSAGE'));
    },
    'AMAZON.StopIntent': function () {
        this.emit(':tell', this.t('STOP_MESSAGE'));
    },
    'SessionEndedRequest': function () {
        this.emit(':tell', this.t('STOP_MESSAGE'));
    }
};

const rp = require('request-promise');
const request = require('request');

exports.particle_get_token = (username,password) => {
	
	const options = {

		method: 'POST',
		uri: 'https://api.particle.io/oauth/token',
		auth: {
			user: 'particle',
			pass: 'particle'
		},
		headers: {
			contentType: 'application/x-www-form-urlencoded',
		},
		form: {
			grant_type: 'password',
	    	username: username,
	    	password: password
		}
	}
	
	return rp(options).then(
		body => {
			const access_token = JSON.parse(body).access_token;
			return(access_token);
		},
		err => {
			console.log(`${err}`);
			return(err);
		}
	);
}

exports.particle_function_call = (access_token,deviceid,api_function) => {

	const options = {
	
		method: 'POST',
		uri: `https://api.particle.io/v1/devices/${deviceid}/${api_function}`,
		headers: {
			contentType: 'application/x-www-form-urlencoded',
		},
		form: {
			access_token: access_token,
		}
	}

	return rp(options).then(
		body => {
			return(body);
		}, 
		err => {
			console.log(`${err}`);
			return(err);
		}
	);
};