Read from a serial port and extract JSON.

readSerial.java

package uk.co.chrishannam;

import com.fazecast.jSerialComm.SerialPort;

import java.io.InputStream;

public class Main {

    public static void main(String[] args) {
        System.out.println("Opening serial");

        SerialPort[] comPorts = SerialPort.getCommPorts();
        SerialPort comPort;
        char c = 'a';
        for (SerialPort i : comPorts) {
            if (i.getDescriptivePortName().equals("USB Serial")) {
                System.out.println(i.getDescriptivePortName());
                comPort = i;
                comPort.openPort();
                comPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_SEMI_BLOCKING, 0, 0);
                InputStream in = comPort.getInputStream();
                try {
                    String jsonString = "";
                    boolean start = false;
                    for (int j = 0; j < 10000; ++j) {
                        c = (char) in.read();

                        if (c == '{') {
                            start = true;
                            jsonString = "";
                            jsonString = jsonString + c;
                        }
                        else if (start){
                            jsonString = jsonString + c;
                        }
                        if (c == '}') {
                            System.out.println(jsonString);
                            in.close();
                            break;
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                comPort.closePort();
            }
        }
        System.out.println("Complete!");
    }
}