omnet++ - I get an error when trying to send to multiple modules using sendDirect

Question

I have to send the same message to multiple modules. I used the following code:

cMessage *msg=new cMessage("Broadcast");
msg->setKind(SENDTOALL);

cTopology topo;
topo.extractByModulePath(cStringTokenizer("**.router*.app[0]").asVector());

cTopology::Node *thisNode = topo.getNodeFor(this);

for (int i = 0; i < topo.getNumNodes(); i++) {
if (topo.getNode(i) == thisNode) continue; // skip ourselves


cModule *targetModule =topo.getNode(i)->getModule();

EV_INFO  << "Get Full Name ------------------- "<<i<< topo.getNode(i)->getModule()->getFullPath()<<endl;

sendDirect(msg,targetModule,"in");

after sending the message to the first module and trying to send to the next module, I get the following error that the message already scheduled and the simulation stops at this point.

Can I get any advice? I will be really thankful.

Thank you in advance.

question from:https://stackoverflow.com/questions/65879799/i-get-an-error-when-trying-to-send-to-multiple-modules-using-senddirect

Answer 1

The message cannot be sent more than once. To send the same message to many modules, every time copy of this message must be created. dup() is the convenient method to make a copy, for example:

cMessage *copyMsg = msg->dup();
sendDirect(copyMsg ,targetModule,"in");

Reference: Simulation Manual - Broadcasting messages