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https://issues.apache.org/jira/browse/DIRMINA-646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julien Vermillard reassigned DIRMINA-646:
-----------------------------------------
Assignee: Julien Vermillard
> More than required data sent on serial port through serial transport
> --------------------------------------------------------------------
>
> Key: DIRMINA-646
> URL: https://issues.apache.org/jira/browse/DIRMINA-646
> Project: MINA
> Issue Type: Bug
> Components: Transport
> Affects Versions: 2.0.0-M3
> Environment: MINA : 2.0.0-M3
> Netbeans 6.5
> Serial port (both hardware COM1 and using com0com's virtual serial ports)
> JDK 1.6.10
> Windows XP (Service Pack 3)
> Reporter: Akbar Munir Chaudhary
> Assignee: Julien Vermillard
>
> The serial transport sends more then required data when IoSession.write() is
> called with the IoBuffer. The following code is the basic usage of serial
> transport:
> -----------------------------------------------------------------------
> SerialAddress a = new SerialAddress("COM1", 115200,
> SerialAddress.DataBits.DATABITS_8, SerialAddress.StopBits.BITS_1,
> SerialAddress.Parity.NONE, SerialAddress.FlowControl.NONE);
> IoConnector c = new SerialConnector();
> c.setHandler(this);
> ConnectFuture cf = c.connect(a);
> cf.awaitUninterruptibly();
> System.out.println("Connection = " + cf.isConnected());
> if (cf.isConnected())
> {
> IoSession s = cf.getSession();
> IoBuffer b = IoBuffer.allocate(32);
> b.put(new String("this is a test message").getBytes());
> b.flip();
> WriteFuture wf = s.write(b);
> wf.awaitUninterruptibly(5, TimeUnit.SECONDS);
> System.out.println("Message Written = " +
> wf.isWritten());
> }
> -----------------------------------------------------------------------
> The message <code>this is a test message</code> should have been sent on the
> serial port COM1. But the actual output received is (output captured through
> HDD Free Serial Port Monitor) :
> -----------------------------------------------------------------------
> 74 68 69 73 20 69 73 20 61 20 74 65 73 74 20 6D this is a test m
> 65 73 73 61 67 65 00 00 00 00 00 00 00 00 00 00 essage..........
> -----------------------------------------------------------------------
> I have looked into the code, and the reason appears to be the following
> statement on line # 184 in the file SerialSessionImpl.java.
> -----------------------------------------------------------------------
> outputStream.write(buf.array());
> -----------------------------------------------------------------------
> Since buf.array() returns the complete array in the IoBuffer, regardless of
> the actual count of valid data, so all bytes are sent. I changed this
> statement to:
> -----------------------------------------------------------------------
> outputStream.write(buf.array(), buf.position(), writtenBytes);
> -----------------------------------------------------------------------
> to ensure that only the required bytes starting from the first unread
> position is sent on the serial port. This works so far for all my cases.
> Thanks,
> Akbar.
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