Running a receiver application on a PC

To run a receiver app on a PC, follow this sequence:

1. Create the receiver folder.
2. Create the ./receiver/package.json file with the following content:

{
"name": "receiver",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
  "start": "node index.js",
  "test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
  "ws": "^2.3.1"
}
}

3. Create the ./receiver/index.js file with the following content:

const WebSocket = require('ws');

const wss = new WebSocket.Server({port: 8080}, function () {
 console.log('Websocket server started');
});

wss.on('connection', function connection(ws) {
 ws.on('message', function incoming(message) {
   console.log('received: ', message);
 });

 // Send message to connected client
 ws.send('hello, client');
});

4. Create the ./receiver/Dockerfile file with the following content:

FROM node:boron-onbuild
EXPOSE 8080

5. Navigate to ./receiver.

6. Build an image and run a Docker container:

# Build an image from a Dockerfile
docker build -t websocket-receiver 

# Run container in foreground
docker run -p 8080:8080 -it --rm --name websocket-receiver-container websocket-receiver

# Run container in background
# docker run -p 8080:8080 -d --rm --name websocket-receiver-container websocket-receiver

# Fetch the logs of a container
# docker logs -f websocket-sensor-container

# Stop running container
# docker stop websocket-receiver-container

The console output displays that the application is running: