UDP based BulkSendApplication

[Majid]

Hi Everyone:

 

I am trying to setup a UDP bulk transfer application similar to the BulkSendApplication implemented in ns3.

 

While BulkSendHelper allows specifiying the type of socket to be used in the application, there is a piece of code in BulkSendApplication implementation that prevents UDP sockets from being used by the application:

 

// Fatal error if socket type is not NS3_SOCK_STREAM or NS3_SOCK_SEQPACKET

  121       if (m_socket->GetSocketType () != Socket::NS3_SOCK_STREAM &&

  122           m_socket->GetSocketType () != Socket::NS3_SOCK_SEQPACKET)

  123         {

  124           NS_FATAL_ERROR ("Using BulkSend with an incompatible socket type. "

  125                           "BulkSend requires SOCK_STREAM or SOCK_SEQPACKET. "

  126                           "In other words, use TCP instead of UDP.");

  127         }

 

My questions is: What is TCP specific in BulkSendApplication implementation that is not consistent with UDP sockets?

 

Thanks.

[Sara Lakani]

Hi Majid

I'm not sure but just to tell my opinion; because in BulkSendApp the acknowledge packets are provisioned, it will not function with other protocols.

BR Sara

[Majid]

Thanks!

 

In the absence of proper documentation about UDP sockets, I can only speculate that the following calls are probably specific to TCP sockets in ns3:

 

      m_socket->SetConnectCallback (
        MakeCallback (&BulkSendApplication::ConnectionSucceeded, this),
        MakeCallback (&BulkSendApplication::ConnectionFailed, this));

      m_socket->SetSendCallback (
        MakeCallback (&BulkSendApplication::DataSend, this));

 

The second call is problematic if UDP sockets have infinite buffer at the sending side.

 

Majid