How to Implement dtn protocols in OMNeT++
To implement the Delay Tolerant Network (DTN) protocols in OMNeT++ encompasses crafting units that act out the conduct of DTN protocols, which are planned to holder irregular connectivity and long suspensions in announcement networks. The DTN protocol is known Epidemic Routing Protocol. The following is the produce to implement the DTN protocol in OMNeT++ by using the INET framework:
Step-by-Step Implementations:
Step 1: Set Up OMNeT++ and INET Framework
- Install OMNeT++:To download and install the new version of OMNeT++ from the OMNeT++
- Install INET Framework: From the INET depository to download and install the INET framework.
Step 2: Define the DTN Protocol
To make the essential .ned and C++ files for the DTN protocol module.
Define the Module in .ned File
Build a .ned file for the DTN protocol module.
simple DTN
{
parameters:
@display(“i=block/router”);
double beaconInterval @unit(s) = default(10s); // Interval for sending beacons
double messageTTL @unit(s) = default(300s); // Time-to-live for messages
gates:
input fromNetworkLayer;
output toNetworkLayer;
input fromMacLayer;
output toMacLayer;
}
Step 3: Implement the DTN Protocol in C++
To make the corresponding .cc and .h files.
DTN.h
#ifndef __DTN_H_
#define __DTN_H_
#include <omnetpp.h>
#include <map>
#include “inet/common/INETDefs.h”
#include “inet/networklayer/contract/IInterfaceTable.h”
#include “inet/networklayer/common/L3Address.h”
#include “inet/networklayer/common/L3AddressResolver.h”
#include “inet/applications/base/ApplicationBase.h”
using namespace omnetpp;
using namespace inet;
class DTN : public ApplicationBase
{
private:
double beaconInterval;
double messageTTL;
cMessage *beaconMsg;
std::map<int, simtime_t> messageTimestamps; // Stores timestamps for message TTL
std::map<L3Address, std::vector<cPacket*>> messageTable; // Stores messages by destination
protected:
virtual void initialize(int stage) override;
virtual void handleMessageWhenUp(cMessage *msg) override;
virtual void handleSelfMessage(cMessage *msg);
virtual void handleUpperMessage(cPacket *packet);
virtual void handleLowerMessage(cPacket *packet);
virtual void sendBeacon();
virtual void forwardMessage(cPacket *packet);
public:
DTN();
virtual ~DTN();
};
#endif
DTN.cc
#include “DTN.h”
Define_Module(DTN);
DTN::DTN() : beaconMsg(nullptr), beaconInterval(10), messageTTL(300)
{
}
DTN::~DTN()
{
cancelAndDelete(beaconMsg);
}
void DTN::initialize(int stage)
{
ApplicationBase::initialize(stage);
if (stage == INITSTAGE_LOCAL)
{
beaconInterval = par(“beaconInterval”);
messageTTL = par(“messageTTL”);
beaconMsg = new cMessage(“beaconMsg”);
}
else if (stage == INITSTAGE_APPLICATION_LAYER)
{
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
}
void DTN::handleMessageWhenUp(cMessage *msg)
{
if (msg->isSelfMessage())
{
handleSelfMessage(msg);
}
else if (msg->arrivedOn(“fromNetworkLayer”))
{
handleUpperMessage(check_and_cast<cPacket *>(msg));
}
else if (msg->arrivedOn(“fromMacLayer”))
{
handleLowerMessage(check_and_cast<cPacket *>(msg));
}
else
{
delete msg;
}
}
void DTN::handleSelfMessage(cMessage *msg)
{
if (msg == beaconMsg)
{
sendBeacon();
scheduleAt(simTime() + beaconInterval, beaconMsg);
}
}
void DTN::handleUpperMessage(cPacket *packet)
{
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
messageTable[destAddr].push_back(packet);
messageTimestamps[packet->getId()] = simTime();
forwardMessage(packet);
}
void DTN::handleLowerMessage(cPacket *packet)
{
L3Address destAddr = L3AddressResolver().resolve(packet->par(“destAddr”).stringValue());
if (destAddr == getParentModule()->getSubmodule(“networkLayer”)->par(“address”))
{
send(packet, “toNetworkLayer”);
}
else
{
forwardMessage(packet);
}
}
void DTN::sendBeacon()
{
cPacket *beaconPacket = new cPacket(“Beacon”);
send(beaconPacket, “toMacLayer”);
}
void DTN::forwardMessage(cPacket *packet)
{
for (auto &entry : messageTable)
{
for (auto &msg : entry.second)
{
if (simTime() – messageTimestamps[msg->getId()] < messageTTL)
{
send(msg->dup(), “toMacLayer”);
}
}
}
}
Step 4: Integrate with Simulation Model
To participate theDTN module into a network simulation model.
Network Configuration .ned File
To build a .ned file to define the network topology.
network DTNNetwork
{
parameters:
@display(“bgb=600,400”);
submodules:
node1: StandardHost {
parameters:
@display(“p=100,100”);
}
node2: StandardHost {
parameters:
@display(“p=300,100”);
}
node3: StandardHost {
parameters:
@display(“p=500,100”);
}
node4: StandardHost {
parameters:
@display(“p=100,300”);
}
node5: StandardHost {
parameters:
@display(“p=300,300”);
}
node6: StandardHost {
parameters:
@display(“p=500,300”);
}
connections:
node1.pppg++ <–> Eth10M <–> node2.pppg++;
node2.pppg++ <–> Eth10M <–> node3.pppg++;
node3.pppg++ <–> Eth10M <–> node4.pppg++;
node4.pppg++ <–> Eth10M <–> node5.pppg++;
node5.pppg++ <–> Eth10M <–> node6.pppg++;
}
Step 5: Configure the Simulation
Configure the simulation parameters in the omnetpp.ini file.
[General]
network = DTNNetwork
**.pppg[*].queue.typename = “DropTailQueue”
**.ipv4.routingTable = “inet.networklayer.routing.manet.Router”
**.networkLayer.networkProtocol.typename = “Ipv4NetworkLayer”
**.transportLayer.tcp.typename = “Tcp”
**.transportLayer.udp.typename = “Udp”
**.application[*].typename = “UdpBasicApp”
**.application[*].destAddresses = “node1” // Set destination as needed
**.application[*].destPort = 2000
**.application[*].startTime = uniform(0s, 10s)
**.application[*].sendInterval = uniform(1s, 2s)
**.application[*].packetLength = 512B
**.app[0].typename = “DTN”
Step 6: Test and Debug
- Run Simulations: To complete simulations to test the conduct of the DTN module under several network conditions.
- Analyze Results: To validate the correctness and show of the enactment.
- Debugging: By using the OMNeT++’s debugging tools to troubleshoot any problems.
Additional Resources
- DTN Papers: Analysis relevant research papers for comprehensive protocol mechanics.
- INET Documentation: The evaluation of the INET framework documentation for comprehensive information on encompassing and adapting network protocols.
- OMNeT++ Community: Apply OMNeT++ community forums and mailing lists for support and direction.
We conclude that how to implement the DTN Protocols in OMNeT++ and to show their coding. We like to offer the further implement of the DTN Protocols in OMNeT++ on your reasech area. Get more guidance on the implementation and evaluation of DTN protocols using the OMNeT++ tool. For optimal simulation outcomes, please reach out to us. We specialize in all models of DTN protocols, so feel free to contact us for the best results in your simulations.