Someone

// gen1.cpp code
// This file implements functionality for the generator module

#include <omnetpp.h>

class Generator: public cSimpleModule
{
    // This is a macro; it expands to constructor definition.
    Module_Class_Members(Generator, cSimpleModule, 8192);
                                 // 8192 - estimated stack size needs

    // The following redefined virtual function implements the
    // module functionality.
    virtual void activity();
};
// The module class needs to be registered with OMNeT++

Define_Module(Generator);

void Generator::activity()
{ 
	while(1)
	{
		cMessage *msg = receive();
		if (msg != NULL)
		{  
			double temp; 
			double p1 = par("prob");
		       // create message
			        cMessage *msg = new cMessage("packet");
	
			      temp = (double)rand()/RAND_MAX;
			      if (temp < p1)
			        {
			          ev << "Generate data packet\n"; 
			          msg -> setKind(1);
			        }
			      else
				{
		        	   ev << "Generate voice packet\n";
		      		   msg -> setKind(0);
			      send(msg, "out");
			      wait(10);
			}
		  }
		  else
		  {
		  wait(10);
		  }
	  }
}