How to control packet generation rate and send interval - omnet++

Question

I am trying to create an UDP application where the packet generation rate and packet send interval can be controlled separately.
My code is in https://github.com/11187162/udpApp
With the above code, I am not getting the expected outcome and getting the following runtime error:
scheduleAt(): Message (omnetpp::cMessage)sendTimer is currently
scheduled, use cancelEvent() before rescheduling -- in module
(inet::UdpOwnApp) SensorNetworkShowcaseA.sensor3.app[0] (id=176), at
t=0.058384669093s, event #10
The code for handleMessageWhenUp() is given below.
void UdpOwnApp::handleMessageWhenUp(cMessage *msg)
{
if (msg->isSelfMessage()) {
ASSERT(msg == selfMsg);
switch (selfMsg->getKind()) {
case START:
processStart();
break;
case GENERATE:
generatePacket();
break;
case SEND:
processSend();
break;
case STOP:
processStop();
break;
default:
throw cRuntimeError("Invalid kind %d in self message", (int)selfMsg->getKind());
}
}
else
socket.processMessage(msg);
}
Would anyone please help me?
Thank you

Answer 1

You have written that "generation rate and packet send interval can be controlled separately" but you use the same self-message for control generation of packets as well as for sending of the packets. When a self-message is scheduled it cannot be scheduled again.
Consider adding a new self-message for generation of packets.
By the way: numGenerate is set to zero and it is never changed.
EDIT
Assuming that selfMsg1 is used for generating packets only the following code may be used:
void UdpOwnApp::handleMessageWhenUp(cMessage *msg) {
if (msg->isSelfMessage()) {
if (msg == selfMsg) {
switch (selfMsg->getKind()) {
case START:
processStart();
break;
case SEND:
processSend();
break;
case STOP:
processStop();
break;
default:
throw cRuntimeError("Invalid kind %d in self message", (int)selfMsg->getKind());
}
} else if (msg == selfMsg1) {
if (selfMsg1->getKind() == GENERATE) {
generatePacket();
}
}
}
else
socket.processMessage(msg);
}
And in initialize() you should create an instance of selfMsg1.