Implementing new agent in NS--agentBB.h

#include "agent.h"
#include "tclcl.h"
#include "packet.h"
#include "address.h"
#include "ip.h"

struct hdr_BB{
 int cmd;
 
 static int offset_;
 inline static int& offset() { return offset_; }
 inline static hdr_BB* access(const Packet* p) { return (hdr_BB*) p->access(offset_); }
};

class agentBB : public Agent {
public:
 agentBB();
 ~agentBB();
 virtual int command(int argc, const char*const* argv);
 virtual void recv(Packet*, Handler*);
 int sendto(nsaddr_t, int); 
};