vijayenthiran subramaniam
Published © GPL3+

Control Things connected to Intel Galileo Gen 2 via AWS IoT

The projects demos controlling various things (components) connected to Intel Galileo by simply posting MQTT messages from AWS IoT console.

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Control Things connected to Intel Galileo Gen 2 via AWS IoT

Things used in this project

Story

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Schematics

Schematics

The schematics explains the connection without the Grove shield.
Schematic

Code

connectToAWS.js

JavaScript
Node JS file to register the device to the AWS IoT Thing
var awsIot = require('aws-iot-device-sdk');

var myThingName = 'intel_galileo';

var thingShadows = awsIot.thingShadow({
   keyPath: './cert/6cf88b301c-private.pem.key',   // path of private key - change the name accourding to your key name
  certPath: './cert/6cf88b301c-certificate.pem.crt', // path of certificate - change the name accourding to your cert name
    caPath: './cert/rootCA.pem',  // path of root file
  clientId: myThingName,
    region: 'us-west-2'  // your region
});

mythingstate = {
  "state": {
    "reported": {
      "LocalIP": "unknown"
    }
  }
}

var networkInterfaces = require( 'os' ).networkInterfaces( );
mythingstate["state"]["reported"]["LocalIP"] = networkInterfaces['enp0s20f6'][0]['address'];


// json data for dynamoDB
var msg = "{\"key\":\"value\"}";

thingShadows.on('connect', function() {
  console.log("Connected...");
  console.log("Registering...");
  thingShadows.register( myThingName );

  // An update right away causes a timeout error, so we wait about 2 seconds
  setTimeout( function() {
    console.log("Updating my IP address...");
    clientTokenIP = thingShadows.update(myThingName, mythingstate);
    console.log("Update:" + clientTokenIP);
  }, 2500 );


  // Code below just logs messages for info/debugging
  thingShadows.on('status',
    function(thingName, stat, clientToken, stateObject) {
       console.log('received '+stat+' on '+thingName+': '+
                   JSON.stringify(stateObject));
    });

  thingShadows.on('update',
      function(thingName, stateObject) {
         console.log('received update '+' on '+thingName+': '+
                     JSON.stringify(stateObject));
      });

  thingShadows.on('delta',
      function(thingName, stateObject) {
         console.log('received delta '+' on '+thingName+': '+
                     JSON.stringify(stateObject));
      });

  thingShadows.on('timeout',
      function(thingName, clientToken) {
         console.log('received timeout for '+ clientToken)
      });

  thingShadows
    .on('close', function() {
      console.log('close');
    });
  thingShadows
    .on('reconnect', function() {
      console.log('reconnect');
    });
  thingShadows
    .on('offline', function() {
      console.log('offline');
    });
  thingShadows
    .on('error', function(error) {
      console.log('error', error);
    });


});

controlThings.py

Python
Python file to control the things connected to the Intel Galileo Board via AWS IoT MQTT
import paho.mqtt.client as mqtt #make sure you have installed mqtt client library for python
import ssl
import json
import time
import thread

#defining necessary pins
led = 4
buzzer = 3
button = 2

#Importing Intel Galileo Official UPM Library
import pyupm_grove as grove

# Create the temperature sensor object using AIO pin 0
temp = grove.GroveTemp(0)

# Create the light sensor object using AIO pin 0
light = grove.GroveLight(1)

# make sure python wiring x86 library is installed.
# Import the GPIOEdison class from the wiringx86 module.
from wiringx86 import GPIOGalileoGen2 as GPIO
gpio = GPIO()

gpio.pinMode(led, gpio.OUTPUT)
gpio.pinMode(buzzer , gpio.PWM)
gpio.pinMode(button, gpio.INPUT)

#defining topics
servoTopic  = "things/servo"
ledTopic    = "things/led"
buttonTopic = "things/button"
buzzerTopic = "things/buzzer"
tempTopic   = "things/temp"
potTopic    = "things/pot"
lightTopic    = "things/light"


def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    client.subscribe(servoTopic)
    client.subscribe(ledTopic)
    client.subscribe(buzzerTopic)
    client.subscribe("topic/test")
    print("Subscribed to Necessary Topics")

def on_message(client, userdata, msg):
    print "Message Topic :" + str(msg.topic)
    print "Message :" + str(msg.payload)
    if str(msg.topic) == ledTopic:
	blinkLED(str(msg.payload))
    elif str(msg.topic) == buzzerTopic:
	soundBuzzer(str(msg.payload))


def blinkLED(msg):
    jsonData = json.loads(msg)
    print jsonData
    for x in range(0,(jsonData['loopFor'])):
        gpio.digitalWrite(led, gpio.HIGH)
        time.sleep(jsonData['Period'])
        gpio.digitalWrite(led, gpio.LOW)
        time.sleep(jsonData['Period'])
    print "Blink LED Done"

def soundBuzzer(msg):
    jsonData = json.loads(msg)
    print jsonData
    gpio.analogWrite(buzzer, jsonData['PWM'])
    time.sleep(jsonData['Period'])
    gpio.analogWrite(buzzer, 0)
    print "Sound Buzzer Done"


client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.tls_set(ca_certs='./cert/rootCA.pem', certfile='./cert/6cf88b301c-certificate.pem.crt', keyfile='./cert/6cf88b301c-private.pem.key', tls_version=ssl.PROTOCOL_SSLv23)
client.tls_insecure_set(True)
client.connect("A1K6TUOC3TPQ8H.iot.us-west-2.amazonaws.com", 8883, 60) #Taken from REST API endpoint



#Publishing Analog Values to AWS
def publishTemp(Dummy):
	while (1):
		celsius = temp.value()
		fahrenheit = celsius * 9.0/5.0 + 32.0;
		tempJsonObject = json.dumps("{'Temp in Celsius':" + str(celsius)  + "}")
		client.publish(tempTopic, payload=tempJsonObject , qos=0, retain=False)
		print "%d degrees Celsius, or %d degrees Fahrenheit.. Published to AWS" % (celsius, fahrenheit)
		#Wait for Five second
		time.sleep(5)

def publishLight(Dummy):
	while (1):
		print "Raw Light Value: " + str(light.raw_value() )
		lightJsonObject = json.dumps("{'Raw Light Value':" + str(light.raw_value() )  + "}")
		client.publish(lightTopic, payload=lightJsonObject , qos=0, retain=False)
		#Wait for Five second
		time.sleep(5)

def buttonPress(Dummy):
	while(1):
		#print "In Loop"
		if gpio.digitalRead(button) == 1:
			print "Button Pressed"
			client.publish(buttonTopic, payload="Button Pressed" , qos=0, retain=False)


thread.start_new_thread(publishTemp,("publishTempThread",))
thread.start_new_thread(publishLight,("publishLightThread",))
thread.start_new_thread(buttonPress,("publishbuttonThread",))


client.loop_forever() #MQTT's will never end

Credits

vijayenthiran subramaniam

vijayenthiran subramaniam

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