How to Implement Network Communication in OMNeT++

To implement network communication in OMNeT++ contains setting up a reproduction atmosphere, defining network and node models, running the simulations and implementing communication protocols. Given below is a procedure to elementary network communication simulation in OMNeT++ by using the INET framework.

Step-by-Step Implementation:

Step 1: Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Go to the OMNeT++ website and download the new models.
2. Install OMNeT++:
   • For the operating system to go the installation instructions.
3. Download and Install INET Framework:
   • For the internet protocols and is oftenly by using OMNeT++ to the INET framework affords models.
   • From the INET website to download it.

Step 2: Set Up Your Project

1. Create a New OMNeT++ Project:
   • Open the OMNeT++ IDE.
   • Go to File -> New -> OMNeT++ Project.
   • Hand-picked the appropriate options and put a project name.
2. Set Up Directory Structure:
   • Certify the project have the required folders, like src for source files and for the NED files and configuration to simulate.

Step 3: Define Network Models Using NED

1. Create NED Files:
   • In the src directory, to make a new NED file like SimpleNetwork.ned.
   • Express the network topology in the NED file. Here’s a sample example:

package simple;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.physicallayer.common.packetlevel.RadioMedium;

network SimpleNetwork

{

parameters:

int numHosts = default(3);

types:

channel radioChannel extends RadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

router: Router {

@display(“p=200,100”);

}

host[numHosts]: StandardHost {

@display(“p=300+100*i,200”);

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numHosts-1 {

host[i].ethg++ <–> Ethernet100M <–> router.ethg++;

}

}

Step 4: Implement Communication Logic in C++

1. Create C++ Modules:
   • In the src directory, form a new C++ class like SimpleApp.cc.
   • Contain required OMNeT++ headers and define the module:

#include <omnetpp.h>

#include “inet/applications/base/ApplicationBase.h”

#include “inet/applications/udpapp/UdpBasicApp.h”

#include “inet/networklayer/common/L3AddressResolver.h”

#include “inet/networklayer/contract/ipv4/Ipv4Address.h”

#include “inet/networklayer/contract/IL3AddressType.h”

using namespace omnetpp;

using namespace inet;

class SimpleApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendPacket();

void handlePacket(cPacket *pkt);

};

Define_Module(SimpleApp);

void SimpleApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialization code

if (par(“sendPackets”).boolValue()) {

scheduleAt(simTime() + par(“startDelay”), new cMessage(“sendPacket”));

}

}

}

void SimpleApp::handleMessageWhenUp(cMessage *msg)

{

if (msg->isSelfMessage()) {

if (strcmp(msg->getName(), “sendPacket”) == 0) {

sendPacket();

scheduleAt(simTime() + par(“sendInterval”), msg);

}

} else {

cPacket *pkt = check_and_cast<cPacket *>(msg);

handlePacket(pkt);

}

}

void SimpleApp::sendPacket()

{

// Create and send a packet

EV << “Sending packet” << endl;

cPacket *pkt = new cPacket(“SimplePacket”);

pkt->setByteLength(par(“packetSize”));

send(pkt, “lowerLayerOut”);

}

void SimpleApp::handlePacket(cPacket *pkt)

{

// Handle received packet

EV << “Received packet: ” << pkt->getName() << endl;

delete pkt;

}

1. Modify NED to Use C++ Modules:
   • Keep posted the NED file to use the ritual application module:

network SimpleNetwork

{

parameters:

int numHosts = default(3);

types:

channel radioChannel extends RadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

router: Router {

@display(“p=200,100”);

}

host[numHosts]: StandardHost {

@display(“p=300+100*i,200”);

@children:

udpApp: SimpleApp {

localPort = 12345;

destPort = 54321;

startTime = uniform(0, 1s);

packetSize = 512B;

sendInterval = exponential(1s);

}

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numHosts-1 {

host[i].ethg++ <–> Ethernet100M <–> router.ethg++;

}

}

Step 5: Configure Simulation Parameters

1. Create omnetpp.ini:
   • In the simulations directory, to make an omnetpp.ini file.
   • State simulation parameters, like duration and network parameters:

[General]

network = SimpleNetwork

sim-time-limit = 100s

**.sendPackets = true

**.startDelay = 1s

**.sendInterval = 2s

**.packetSize = 512B

Step 6: Build and Run the Simulation

1. Build the Project:
   • In the OMNeT++ IDE, right-click on the project and choice Build Project.
2. Run the Simulation:
   • Go to Run -> Run Configurations.
   • Setting up a new run configuration for the project and run the simulation.

Step 7: Analyze Results

1. View Simulation Results:
   • After the simulation ends, use OMNeT++’s tools to evaluate the results.
   • Exposed the ANF (Analysis Framework) to visualize and read the data.

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