Ptr<BulkSendApplication> app = DynamicCast<BulkSendApplication> (nodes.Get(0)->GetApplication(0));
app->TraceConnectWithoutContext("Tx", MakeCallback(&TxTrace));
void TxTrace(Ptr<const Packet> p)
{
NS_LOG_UNCOND("tx packet");
}
and it works without any problem.
Regards,
K.