UDT-Java / Discussion / Open Discussion: java udt can't connect c UDT

Jhone hero - 2010-08-20

oh,god!
   It's not work!

I use java UDT iar (client) connect   c UDT Service?
   but failred!
please help…
                                 my mail   zzw2010@gmail.com

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Bernd Schuller - 2010-08-20

… can you be a bit more precise? What exactly did you try and what did not work?

Bernd.

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Jhone hero - 2010-08-20

client = new UDTClient(InetAddress.getLocalHost());
InetSocketAddress address = new InetSocketAddress(SERVER_IP,
SERVER_PORT);
client.connect(address);
I do for that client! and I recevic HandShake from c udt service
but c UDT Service accept method don't anything!

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Jhone hero - 2010-08-20

In java UDT   HandShake    I    add     long icookies   and    long Ipv4   two region

                                so   service return something
        but    don't anything!

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gao fei - 2010-08-20

client by java just send 1st frame about handshake ,and get response then do nothing at all .The server (c++)cannot recive anything.

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Jhone hero - 2010-08-20

2010-8-20 16:52:13 udt.ClientSession sendHandShake
information: Handshake to Destination: 192.168.6.20 port=9000 socketID=0
2010-8-20 16:52:13 udt.ClientSession received
information: Received connection handshake from Destination: 192.168.6.20 port=9000 socketID=1
2010-8-20 16:52:13 udt.UDTSession setState
information: udt.ClientSession@1bf73fa connection state CHANGED to <2>
2010-8-20 16:52:14 udt.ClientSession connect
information: Connected, 1 handshake packets sent
2010-8-20 16:52:14 udt.UDTClient connect
information: The UDTClient is connected

                     I hope this information can help you!
                                 please fix this bug!               The java_udt will be very   useful.
jhone

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Bernd Schuller - 2010-08-20

hi,

Java and C++ versions of UDT can't talk to each other, because the Java implementation is not fully finished
Sorry, you need to be patient, since currently I do not have much time for udt-java

Thanks and regards,
Bernd.

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Jhone hero - 2010-08-23

Oh, god!
can you tell me which part you not achieve?

I want to try to do it……………

jhone~

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Bernd Schuller - 2010-08-23

… for example finding out why the java and c++ versions do not quite understand each other.

1) initial sequence number handling is different (e.g. Java starts at zero, C++ at a random number)
2) the binary packet encoding might be different (but I'm not sure here)

I'd look at 1) if I had some time

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Jhone hero - 2010-08-24

Thanks…

jhone~

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Jhone hero - 2010-08-27

Hi

                Four timers are: RC timer, ACK timer, NAK timer, EXP timer. Their periods are: RCTP, ATP, NTP, ETP

                         Is it   synchronization with   C++ UDT timer?
           I find something is not correct, but I can't be sure.

    ~johoe

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Bernd Schuller - 2010-08-27

hi,
no, the timers do not need to be synchronized.

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Jhone hero - 2010-08-27

but    java always send ack( LightAck or normal),   but   c++ is not always.

    It   make me puzzle !

java
if (!isTriggeredByTimer)
{
ackSeqNumber = sendLightAcknowledgment(ackNumber);
return;
}
else
{
// pack the packet speed and link capacity into the ACK packet and
// send it out.
// (7).records the ACK number,ackseqNumber and the departure time of
// this Ack in the ACK History Window
ackSeqNumber = sendAcknowledgment(ackNumber);
}

C++
   if ((currtime > m_ullNextACKTime) || ((m_pCC->m_iACKInterval > 0) && (m_pCC->m_iACKInterval <= m_iPktCount)))
   {
      // ACK timer expired or ACK interval reached

      sendCtrl(2);
      CTimer::rdtsc(currtime);
      if (m_pCC->m_iACKPeriod > 0)
         m_ullNextACKTime = currtime + m_pCC->m_iACKPeriod * m_ullCPUFrequency;
      else
         m_ullNextACKTime = currtime + m_ullACKInt;

      m_iPktCount = 0;
      m_iLightACKCount = 1;
   }
   else if (m_iSelfClockInterval * m_iLightACKCount <= m_iPktCount)
   {
      //send a "light" ACK
      sendCtrl(2, NULL, NULL, 4);
      ++ m_iLightACKCount;
   }

I don't understand!

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Bernd Schuller - 2010-08-27

… UDT is complex :)
If your problem is that UDT Java and UDT C++ cannot talk to each other, the problem is NOT the ACK.
You can send as many ack as you want.

The connection setup in the Java and C++ versions is slightly different, as I wrote before.
Is it required for your use case to mix Java and C++?

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Jhone hero - 2010-08-27

yes!
   I need java Client    vist   c++ service

   send   and receive data!

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Jhone hero - 2010-09-01

Hi,
         I am glad to see you update java_UDT!
     Thank you!
                                       can you help me check   class UDTReceiver    receiverAlgorithm() method, the four time is not synchronization      c UDT   ,can you help me check it!
       Thanks~~~

~jhone

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Bernd Schuller - 2010-09-01

as I said before, it is not necessary to synchronize timers…

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Jhone hero - 2010-09-01

ok!
I am connected c UDT Service!
send data and recev data! but in class UDTReceiver receiverAlgorithm() method, send ack very frequently, so it not correct work! can you help me?

~jhome

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Bernd Schuller - 2010-09-01

sorry, but you can send as many ACK as you want… the UDT protocol will work. If you think there is too many ACK, you can increase the ACK interval (variable ackTimerInterval). The value used is that from the UDT specification. But again, the number of ACKs should not create problems.

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Jhone hero - 2010-09-01

god!
It;s so complex !

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Jhone hero - 2010-09-06

hi~
In UDTClient.java file cann't find any method can prove the udtClient is alive, I want add a method, but I don't know where I shuould add a method?
~jhone

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Bernd Schuller - 2010-09-06

you can use udtClient.getSession().isReady()

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Jhone hero - 2010-09-06

Thanks ~~
I means it connect service , but network status is very bad, so service disconnect client, in this time , client cann't know disconnected!

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Bernd Schuller - 2010-09-06

there is an expiry interval and keep alive messages in the UDTReceiver, maybe you can add some code there that sets the session state to invalid? Right now I'm a bit busy and can't do much on UDT Java, sorry

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Jhone hero - 2010-09-06

Thanks for your suggestion!

                        pass the these day, I find you code is very good!   I learn much through your java-udt , how long do you work in coder?     I want to be the man same of you, but I am very blindness. please give me some suggestion about coder?
       Thanks~
~ jhone

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java udt can't connect c UDT