SENA HD1100 - Manual (Page 37)

Starter Kit and User Manual for the HelloDevice 1100
34
commandBuf[0] = IOSet ;
commandBuf[1] = (BYTE) ((IOStatus[2] >> 8) & 0x000000ff) ;
commandBuf[2] = (BYTE) (IOStatus[3] & 0x000000ff) ;
commandLen = 3 ;
// Send command to HelloDevice
err = sendto
(
sock,
&commandBuf,
commandLen,
0,
(struct sockaddr*)&clientAddr,
sizeof(clientAddr)
) ;
if (err == -1 )
{
perror("\nsend error\n");
exit (1);
}
}
6.3.2 Communication Using Java Applet
The program source code for a Java applet (IOdemo.java, IOComm.java, Led.java and OutButton.java) can be
found at the “…\Source\java” subdirectory of the HelloDevice installation folder. The users can build his own
Web-based remote I/O control by inserting this Java applet in to their Web page.
The following Java program source shows an example implementing the Internet socket interface using a Java
applet that sends and receives I/O control signals through the TCP port number 6001 of the HelloDevice.
/* Output read */
public int readValueTCP() {
Socket socketTCP = null;
int tmp = 0;
int inputData = 0;
byte rxData[] = new byte[16];
byte data[] = {COMMAND_GET};
try {
socketTCP = new Socket(InetAddress.getByName(m_host), m_port);
socketTCP.setTcpNoDelay(true);
socketTCP.getOutputStream().write(data, 0, data.length);
instream = new DataInputStream(socketTCP.getInputStream());
tmp = instream.read(rxData, 0, rxData.length);
if (tmp != -1) {
inputData = (int) (rxData[2] << 8 | (rxData[3] & 0x00ff));
inputData &= 0xffff;
}
socketTCP.close();
instream.close();
} catch (Exception e) {
System.out.println("Err : " + e);
}
return inputData;
}
/* Output write */
public void wirteValueTCP(int outdata) {
Socket socketTCP = null;
byte[] data = new byte[4];