gateway.java

/*
    Made by Widi
 */
package arduino;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.IOException;
import java.util.Enumeration;

// internet stuff here
import java.net.*;

public class SerialTest implements SerialPortEventListener {

    SerialPort serialPort;
    /**
     * The port we're normally going to use.
     */
    private static final String PORT_NAMES[] = {"/dev/tty.usbserial-A9007UX1", // Mac OS X
        "/dev/ttyUSB0", // Linux
        "COM7", // Windows
};
    private BufferedReader input;
    private OutputStream output;
    private static final int TIME_OUT = 2000;
    private static final int DATA_RATE = 115200;

// Internet stuff
    private static String link = "https://demo.thingsboard.io/api/v1/Jlpkzg3VHdeUOXGmGDNv/telemetry";

    public void initialize() {
        CommPortIdentifier portId = null;
        Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

        //First, Find an instance of serial port as set in PORT_NAMES.
        while (portEnum.hasMoreElements()) {
            CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
            for (String portName : PORT_NAMES) {
                if (currPortId.getName().equals(portName)) {
                    portId = currPortId;
                    break;
                }
            }
        }
        if (portId == null) {
            System.out.println("Could not find COM port.");
            return;
        }

        try {
            serialPort = (SerialPort) portId.open(this.getClass().getName(),
                    TIME_OUT);
            serialPort.setSerialPortParams(DATA_RATE,
                    SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);

            // open the streams
            input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
            output = serialPort.getOutputStream();

            serialPort.addEventListener(this);
            serialPort.notifyOnDataAvailable(true);
        } catch (Exception e) {
            System.err.println(e.toString());
        }
    }

    public synchronized void close() {
        if (serialPort != null) {
            serialPort.removeEventListener();
            serialPort.close();
        }
    }

    public synchronized void serialEvent(SerialPortEvent oEvent) {
        if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
            try {
                String inputLine = null;
                if (input.ready()) {
                    inputLine = input.readLine();
                    System.out.println(inputLine);
                    sendJSON(inputLine);
                }

            } catch (Exception e) {
                System.err.println(e.toString());
            }
        }
        // Ignore all the other eventTypes, but you should consider the other ones.
    }

    public static void main(String[] args) throws Exception {
        SerialTest main = new SerialTest();
        main.initialize();
        Thread t = new Thread() {
            public void run() {
                //the following line will keep this app alive for 1000    seconds,
                //waiting for events to occur and responding to them    (printing incoming messages to console).
                try {
                    Thread.sleep(1000000);
                } catch (InterruptedException ie) {
                }
            }
        };
        t.start();
        System.out.println("Started");
    }

// INTERNET STUFF BELOW
    public static void sendJSON(String data) throws IOException {
        URL url = null;
        try {
            url = new URL(link);
        } catch (MalformedURLException ex) {
            System.out.println(ex);
        }
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("Content-Type", "application/json; utf-8");
        con.setRequestProperty("Accept", "application/json");
        con.setDoOutput(true);
        String jsonInputString = "{\"consumption\":\"" + data + "\"}";

        try (OutputStream os = con.getOutputStream()) {
            byte[] input = jsonInputString.getBytes("utf-8");
            os.write(input, 0, input.length);
        }

        //reading response
        try (BufferedReader br = new BufferedReader(
                new InputStreamReader(con.getInputStream(), "utf-8"))) {
            StringBuilder response = new StringBuilder();
            String responseLine = null;
            while ((responseLine = br.readLine()) != null) {
                response.append(responseLine.trim());
            }
//            System.out.println(response.toString());
        }
    }
}