Omnet++

simple computer
{
    gates:
        input in;
        output out;
}

//
// TODO documentation
//
network net
{
    @display("bgb=386,146");
    submodules:
        computer1: computer {
            @display("p=46,69");
        }
        computer2: computer {
            @display("p=298,69");
        }
    connections:
        computer1.out --> computer2.in;
        computer2.out --> computer1.in;
}

#include <string.h>
#include <omnetpp.h>

class computer : public cSimpleModule
{
protected:
  virtual void initialize();
  virtual void handleMessage(cMessage *msg);
};

Define_Module(computer);

void computer::initialize()
{
    if (strcmp("computer", getName()) == 0)
    {
        cMessage *msg = new cMessage("checking");
                send(msg, "out");
    }
}

void computer::handleMessage(cMessage *msg)
{

    send(msg, "out");
}