Comunicação de Serial para Java

1

Boa tarde, estou com um problema ao abrir porta serial ela retorna “Port Busy” como porta ocupada. uso o Postman para enviar os parametros. so preciso que retorne um valor de peso como uma string.

package com.alvorada.weight.api;

import java.util.HashMap;

// import com.fazecast.jSerialComm.SerialPort;
// import java.io.InputStream;
// import java.io.OutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
// import com.fazecast.jSerialComm.*;
import jssc.SerialPort;
import jssc.SerialPortException;

@RestController
@RequestMapping("/readweight")
public class SerialPortController {

@GetMapping()
public HashMap<String, String>  listar(@RequestParam("typebal") String typeBal, @RequestParam("dtr") Boolean dtr,
		@RequestParam("rts") Boolean rts, @RequestParam("readbuffer") Integer readBuffer,
		@RequestParam("receivedbytes") Integer receivedBytes, @RequestParam("port") String port,
		@RequestParam("baudrate") Integer baudRate, @RequestParam("databits") Integer dataBits,
		@RequestParam("parity") Integer parity, @RequestParam("stopbits") Integer stopBits,
		@RequestParam("stringlength") Integer stringLenght) {

	String result = "";

	// result = "typebal = " + typeBal + " dtr=" + dtr.toString() + "  rts=" + rts.toString() + "  readbuffer="
	// 		+ readBuffer.toString() + "  receivedbytes=" + receivedBytes.toString() + "  port=" + port
	// 		+ "  baudrate=" + baudRate + "  databits=" + dataBits + "  parity=" + parity + "  stopbits=" + stopBits;
	
	result = connectPort(dtr, rts, readBuffer, receivedBytes, port, baudRate, dataBits, parity, stopBits,
			stringLenght);

//HashMap<String, String>
//@test
//result = “8&)p’1234567891011”;
HashMap<String, String> mapRet = new HashMap<>();
mapRet.put(“peso”, result);
return mapRet;
}

private String connectPort(Boolean dtr, Boolean rts, Integer readBuffer, Integer receivedBytes, String port,
		Integer baudRate, Integer dataBits, Integer parity, Integer stopBits, Integer stringLenght) {
	SerialPort serialPort = new SerialPort(port);	

	String saida = "";
	if (stringLenght == null) {
		stringLenght = 20;
	}
	
	try {
		// if (serialPort.isOpened ()) { 
		// 	serialPort.removeEventListener(); 
		// 	serialPort.closePort (); 
		// }
		if (serialPort != null && serialPort.isOpened ()) { 
			// serialPort.purgePort (1); 
			// serialPort.purgePort (2); 
			serialPort.closePort (); 
		}
		
		serialPort.openPort();
		serialPort.setParams(baudRate, dataBits, stopBits, parity);
		serialPort.setDTR(dtr);
		serialPort.setRTS(rts);

// while (closePort <= 1) {
// String informacao = serialPort.readString(stringLenght);
// closePort++;
// saida = saida + informacao;
// }

		String informacao = serialPort.readString();
		saida = informacao.substring(0, stringLenght.intValue());
		serialPort.closePort();
	} catch (SerialPortException e) {

// System.out.println(e);
// e.printStackTrace();
return e.getMessage();
}

	return saida;

}

}