How to Implement M2M Communication in OMNeT++

To implement the Machine-to-Machine (M2M) communication in OMNeT++ in which the simulating environment must contains M2M devices, defining network models, implementing communication protocols, and running simulations. In the following below, we can see the implementation of m2m communication in the OMNeT++:

Step-by-Step Implementation:

Step 1: Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Download the latest version in OMNeT++.
2. Install OMNeT++:
   • Based on your operating system, install the appropriate version.
3. Download and Install INET Framework:
   • The INET framework offers the models for internet protocols and is frequently used with OMNeT++.
   • Install the INET framework on your computer.

Step 2: Set Up Your Project

1. Create a New OMNeT++ Project:
   • Open the OMNeT++ IDE.
   • Go to File -> New -> OMNeT++ Project.
   • Enter a project name and select the appropriate options.
2. Set Up Directory Structure:
   • Make certain the project contains necessary folders like src for source files and simulations for NED files and configuration.

Step 3: Define Network Models Using NED

1. Create NED Files:
   • In the src directory, create a new NED file (example, M2MNetwork.ned).
   • Define the network topology in the NED file. Here’s a sample:

package m2m;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;

import inet.physicallayer.ieee80211.packetlevel.Ieee80211ScalarRadioMedium;

import inet.mobility.single.RandomWaypointMobility;

network M2MNetwork

{

parameters:

int numDevices = default(20);

int numRouters = default(2);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

router[numRouters]: Router {

@display(“p=300,200+100*i”);

}

device[numDevices]: StandardHost {

@display(“p=200+100*i,400”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numDevices-1 {

device[i].wlan[0] <–> radioMedium <–> router[i % numRouters].wlan[0];

}

}

Step 4: Implement Communication Logic in C++

1. Create C++ Modules:
   • In the src directory, create a new C++ class (e.g., M2MDevice.cc).
   • Has essential OMNeT++ headers and define your 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 M2MDevice : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendPacket();

void handlePacket(cPacket *pkt);

};

Define_Module(M2MDevice);

void M2MDevice::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialization code

if (par(“sendPackets”).boolValue()) {

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

}

}

}

void M2MDevice::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 M2MDevice::sendPacket()

{

// Create and send a packet

EV << “Sending packet” << endl;

cPacket *pkt = new cPacket(“M2MPacket”);

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

send(pkt, “lowerLayerOut”);

}

void M2MDevice::handlePacket(cPacket *pkt)

{

// Handle received packet

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

delete pkt;

}

1. Modify NED to Use C++ Modules:
   • Update your NED file to use the custom M2M device module :

network M2MNetwork

{

parameters:

int numDevices = default(20);

int numRouters = default(2);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

router[numRouters]: Router {

@display(“p=300,200+100*i”);

}

device[numDevices]: M2MDevice {

@display(“p=200+100*i,400”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numDevices-1 {

device[i].wlan[0] <–> radioMedium <–> router[i % numRouters].wlan[0];

}

}

Step 5: Configure Simulation Parameters

1. Create omnetpp.ini:
   • Create an omnetpp.ini file within the simulation directory.
   • Define simulation parameters like duration and network parameters:

[General]

network = M2MNetwork

sim-time-limit = 100s

**.sendPackets = true

**.startDelay = 1s

**.sendInterval = 2s

**.packetSize = 1024B

**.device[*].mobility.typename = “inet.mobility.single.RandomWaypointMobility”

Step 6: Build and Run the Simulation

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

Step 7: Analyze Results

1. View Simulation Results:
   • After the simulation concludes, use OMNeT++’s tools to analyze the results.
   • Visualize and translate the data by opening the ANF (Analysis Framework).

Finally, this guide provided a step-by-step approach to set up a basic M2M communication simulation in OMNeT++ using the INET framework. If you have any queries regarding this script, we will help you with best simulation results..