p2p-carsell-raspi

If you are coming to this repo direcly, I would request you to parent repo ( https://github.com/just4give/p2p-carsell-ethereum-raspi.git) first.

Once you have setup the project from above link on your computer execute below command from inside your Raspberry Pi. Replace LOCAL_TUNNEL_URL which you noted earlier.

git clone https://github.com/just4give/p2p-carsell-raspi.git && cd p2p-carsell-raspi && npm install
RPC_URL="LOCAL_TUNNEL_URL" node .

Prerequisites

Before you can execute above command to start up your nodejs application there are few things you need to do

• Make sure your are running nodejs 4.x or higher. Here is what I have used.

pi@raspberrypi:~/p2p-carsell-raspi $ node -v
v4.8.2
pi@raspberrypi:~/p2p-carsell-raspi $ npm -v
1.4.21
pi@raspberrypi:~/p2p-carsell-raspi $ 

• Install and configure motion software on your Raspberry pi for PiCam module used for live streaming on /dev/video0

sudo apt-get update
sudo apt-get install motion
sudo nano /etc/modules
At the end of the file add below 
bcm2835-v4l2
Ctrl+X , then Y to come out of nano
sudo mkdir /var/lib/motion
sudo chown motion:motion /var/lib/motion
sudo nano /etc/default/motion
change the value to yes for the demon to run on startup 
sudo reboot

Once Pi has been rebooted, paste below address on your computer browser to make sure motion is working. You should see live stream from your pi camera.

http://<YOUR_RASPBERRY_IP>:8081/

• Plug in USB Webcamera to your Raspberry Pi which will be used to scan QR code on /dev/video1. Then issue below commands.

    $ lsusb
    $ ls -lrt /dev/video1

You should see your camera in the list. I am using Creative Technology, Ltd Live! Cam Sync HD

• Install zbar software which will scan the QR Code

sudo apt-get install zbar-tools flite
sudo apt-get install python-qrtools
sudo apt-get install libzbar-dev
sudo pip install zbar

To make sure zbar installed properly, execute below command on your pi and then bring a sample QR code in front of the webcam. Webcam should be able to decode the QR code.

zbarcam --nodisplay --raw /dev/video1

• Install AWS CLI and Configure

sudo pip install awscli
aws configure
Your user should have permisson for AWS Polly, SNS and IOT

• Create IOT Object on AWS Console. Update below code (aws-iot.js) with your IoT name and certificates

var thingName ='BlockChainGarage';

var thingShadows = awsIot.thingShadow({
      keyPath: './certs/BlockChainGarage.private.key',
  certPath: './certs/BlockChainGarage.cert.pem',
    caPath: './certs/root-CA.crt',
  clientId: 'client12344567',
  region:'us-east-1',
  host:'a2c6vtfn7g8m57.iot.us-east-1.amazonaws.com'
});

• Cretae SNS Topic and Subscription to receive SMS. Update below code (index.js) with your SNS URN and update Raspberry IP

sns.publish({
  Message: 'Buyer has opened your garage. http://192.168.0.11:8081' ,
  TopicArn: 'arn:aws:sns:us-east-1:027378352884:p2pCarSell'
  }, function (err, data) {
        if(err){
        }else{
        }

  });