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Published © GPL3+

Amazon Echo – Control DIY IoT devices with PHPoC

How to use Amazon Echo to voice-control the DIY IoT devices.

IntermediateFull instructions provided2,399
Amazon Echo – Control DIY IoT devices with PHPoC

Things used in this project

Hardware components

Echo Dot
Amazon Alexa Echo Dot
×1
PHPoC Blue
PHPoC Blue
×1
PHPoC 4-Port Relay Expansion Board (S-type)
PHPoC 4-Port Relay Expansion Board (S-type)
This board contain relay to turn on/off a the high-voltage light bulb
×1
Light Bulb
×1

Software apps and online services

Alexa Skills Kit
Amazon Alexa Alexa Skills Kit
AWS Lambda
Amazon Web Services AWS Lambda
MQTT
MQTT

Story

Read more

Custom parts and enclosures

Full Lambda code

Code

Lambda function (index.js)

JavaScript
This code is fired when Alexa Service request. The code process the incoming data (intent), get command (on/off), send the commands to MQTT broker, and the send response to Alexa Service
'use strict';

/**
 * This sample demonstrates a simple skill built with the Amazon Alexa Skills Kit.
 * The Intent Schema, Custom Slots, and Sample Utterances for this skill, as well as
 * testing instructions are located at http://amzn.to/1LzFrj6
 *
 * For additional samples, visit the Alexa Skills Kit Getting Started guide at
 * http://amzn.to/1LGWsLG
 */

var mqtt = require('mqtt');

// --------------- Helpers that build all of the responses -----------------------

function buildSpeechletResponse(title, output, repromptText, shouldEndSession) {
    return {
        outputSpeech: {
            type: 'PlainText',
            text: output,
        },
        card: {
            type: 'Simple',
            title: "SessionSpeechlet - " + title,
            content: "SessionSpeechlet - " + output,
        },
        reprompt: {
            outputSpeech: {
                type: 'PlainText',
                text: repromptText,
            },
        },
        shouldEndSession: shouldEndSession
    };
}

function buildResponse(sessionAttributes, speechletResponse) {
    return {
        version: '1.0',
        sessionAttributes,
        response: speechletResponse,
    };
}


// --------------- Functions that control the skill's behavior -----------------------

function getWelcomeResponse(callback) {
    // If we wanted to initialize the session to have some attributes we could add those here.
    const sessionAttributes = {};
    const cardTitle = 'Welcome';
    const speechOutput = "Welcome to P H P o C. How can I help you?"
    // If the user either does not reply to the welcome message or says something that is not
    // understood, they will be prompted again with this text.
    const repromptText = "How can I help you?";
    const shouldEndSession = false;

    callback(sessionAttributes,
        buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
}

function handleSessionEndRequest(callback) {
    const cardTitle = 'Session Ended';
    const speechOutput = 'Thank you for trying the Alexa Skills Kit sample. Have a nice day!';
    // Setting this to true ends the session and exits the skill.
    const shouldEndSession = true;

    callback({}, buildSpeechletResponse(cardTitle, speechOutput, null, shouldEndSession));
}

function createLightBulbAttributes(lightBulb) {
    return {
        lightBulb: lightBulb
    };
}

/**
 * Control Light Bulb in the session and prepares the speech to reply to the user.
 */
function controlLightBulbInSession(intent, session, callback) {
    const cardTitle = intent.name;
    const lightStateRequest = intent.slots.LightState;
    let repromptText = '';
    let sessionAttributes = {};
    const shouldEndSession = true;
    let speechOutput = '';

    if (lightStateRequest) {
		var lightState = lightStateRequest.value;
		//Update 
		var mqttpromise = new Promise( function(resolve,reject){
			var client = mqtt.connect({port:1883,host:'iot.eclipse.org'})
			
			client.on('connect', function() { // When connected
				// publish a message to any mqtt topic
				client.publish('alexa/phpoc/lightbulb', lightState)
				client.end()
				resolve('Done Sending');
			});
			
		});
		mqttpromise.then(
			function(data) {
				console.log('Function called succesfully:', data);
				sessionAttributes = createLightBulbAttributes(lightState);
				speechOutput = "Ok, turning the light " + lightState;
				repromptText = "Ok, turning the light " + lightState;
				callback(sessionAttributes,buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
			},
			function(err) {
				console.log('An error occurred:', err);
			}
		);
		 
	} else {
		speechOutput = "Please try again";
		repromptText = "Please try again";
		callback(sessionAttributes,buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
	}
}

// --------------- Events -----------------------

/**
 * Called when the session starts.
 */
function onSessionStarted(sessionStartedRequest, session) {
    console.log("onSessionStarted requestId=${sessionStartedRequest.requestId}, sessionId=${session.sessionId}");
}

/**
 * Called when the user launches the skill without specifying what they want.
 */
function onLaunch(launchRequest, session, callback) {
    console.log("onLaunch requestId=${launchRequest.requestId}, sessionId=${session.sessionId}");

    // Dispatch to your skill's launch.
    getWelcomeResponse(callback);
}

/**
 * Called when the user specifies an intent for this skill.
 */
function onIntent(intentRequest, session, callback) {
    console.log("onIntent requestId=${intentRequest.requestId}, sessionId=${session.sessionId}");

    const intent = intentRequest.intent;
    const intentName = intentRequest.intent.name;

    // Dispatch to your skill's intent handlers
    if (intentName === 'ControlLightBulb') {
        controlLightBulbInSession(intent, session, callback);
    } else if (intentName === 'AMAZON.HelpIntent') {
        getWelcomeResponse(callback);
    } else if (intentName === 'AMAZON.StopIntent' || intentName === 'AMAZON.CancelIntent') {
        handleSessionEndRequest(callback);
    } else {
        throw new Error('Invalid intent');
    }
}

/**
 * Called when the user ends the session.
 * Is not called when the skill returns shouldEndSession=true.
 */
function onSessionEnded(sessionEndedRequest, session) {
    console.log("onSessionEnded requestId=${sessionEndedRequest.requestId}, sessionId=${session.sessionId}");
    // Add cleanup logic here
}


// --------------- Main handler -----------------------

// Route the incoming request based on type (LaunchRequest, IntentRequest,
// etc.) The JSON body of the request is provided in the event parameter.
exports.handler = (event, context) => {
    try {
        console.log("event.session.application.applicationId=${event.session.application.applicationId}");

        /**
         * Uncomment this if statement and populate with your skill's application ID to
         * prevent someone else from configuring a skill that sends requests to this function.
         */
        /*
        if (event.session.application.applicationId !== 'amzn1.echo-sdk-ams.app.[unique-value-here]') {
             context.fail("Invalid Application ID");
        }
        */

        if (event.session.new) {
            onSessionStarted({ requestId: event.request.requestId }, event.session);
        }

        if (event.request.type === 'LaunchRequest') {
            onLaunch(event.request,
                event.session,
                function callback(sessionAttributes, speechletResponse) {
					context.succeed(buildResponse(sessionAttributes, speechletResponse));
				});
        } else if (event.request.type === 'IntentRequest') {
            onIntent(event.request,
                event.session,
                function callback(sessionAttributes, speechletResponse) {
					context.succeed(buildResponse(sessionAttributes, speechletResponse));
				});
        } else if (event.request.type === 'SessionEndedRequest') {
            onSessionEnded(event.request, event.session);
            context.succeed();
        }
    } catch (e) {
        context.fail("Exception: " + e);
    }
};

PHPoC code (task0.php)

PHP
This code is run on PHPoC- a IoT hardware platform. It subscribes and MQTT topic and turn on/off the light when receive MQTT message
<?php

if(_SERVER("REQUEST_METHOD"))
    exit; // avoid php execution via http request

include_once "/lib/sd_spc.php";
include_once "/lib/sn_dns.php";
include_once "/lib/vn_mqtt.php";

spc_reset();
spc_sync_baud(115200);

//$host_name = "test.mosquitto.org";
$host_name = "iot.eclipse.org";
//$host_name = "broker.hivemq.com";
//$host_name = "broker.mqttdashboard.com";
//$host_name = "[192.168.0.3]";
$port = 1883;

mqtt_setup(0, "Alexa PHPoC 1",  $host_name, $port); 

$will = "";
$username = "";
$password = "";

mqtt_connect(true, $will, $username, $password);

$out_topics = array(array("alexa/phpoc/lightbulb", 1));

if(mqtt_state() == MQTT_CONNECTED)
    mqtt_subscribe($out_topics);

$in_topic = "";
$in_content = "";
$is_retain = 0;

while(1)
{    
    if(mqtt_state() == MQTT_DISCONNECTED)
        while(mqtt_reconnect() == false);
    
    if(mqtt_loop($in_topic, $in_content, $is_retain))
    {
		if($in_content === "on")
		{
			//turn on the light bulb
			echo "turn on the light bulb\r\n";
			spc_request(14, 4, "set 0 output high");
		}
		else if($in_content === "off")
		{
			//turn off the light bulb
			echo "turn off the light bulb\r\n";
			spc_request(14, 4, "set 0 output low");
		}
		else
		{
			echo "unknown command\r\n";
		}
    }
}
   
mqtt_disconnect();

?>

Credits

phpoc_man

phpoc_man

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