Problem with multiple byte writes

[Lee Bethune]

Trying to get serial communication to work between a Pi and a robot.

Serial writes work well with single bytes. Cannot get multiple byte writes to work. 

I am trying to duplicate Python script. See below. 

Most of the code was borrowed from Serial.Example.java

Can anyone tell me what is the problem as outlined below.

// START SNIPPET: serial-snippet

import java.util.Date;

import com.pi4j.io.serial.Serial;

import com.pi4j.io.serial.SerialDataEvent;

import com.pi4j.io.serial.SerialDataListener;

import com.pi4j.io.serial.SerialFactory;

import com.pi4j.io.serial.SerialPortException;

public class Song02 {

    

    public static void main(String args[]) throws InterruptedException {

                      

       // create an instance of the serial communications class

        final Serial serial = SerialFactory.createInstance();

        serial.open(Serial.DEFAULT_COM_PORT, 115200);

        Thread.sleep(2000);

        System.out.println("Safe irobot silent");

        Thread.sleep(2000);

      

        //Python code below works for single byte writes

        //ser.write('\x83')  # Assuming the robot is awake, start safe mode so we can hack.

        // Corresponding java code below compiles, runs, and works

        serial.write((byte)  0x83); 

        Thread.sleep(2000);

        //Python code below works well for multiple byte writes

        //python ser.write('\0x8c \0x00 \0x02 \0x1F \0x40 \0x37 \0x40') 

        //java code below compiles, runs, but does not work. Likely cockpit error.        

        byte[] songsheet={(byte) 0x8c, (byte) 0x00, (byte) 0x02, (byte) 0x1F, (byte) 0x40, (byte) 0x37, (byte) 0x40};

        serial.write((byte[])  songsheet);

}

}

// END SNIPPET: serial-snippet

[Lee Bethune]

Solved