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How to Implement Wireless Sensor Network in OMNeT++

To implement the wireless sensor network (WSN) in OMNeT++ has needs to encompass to generate the emulation with the sensor nodes then describe the network topology and then execute the communication protocols and compile the mimic.

The given below are the detailed procedures on how to implement the Wireless sensor network in OMNet++:

Step-by-Step Implementation:

Step 1: Install OMNeT++ and INET Framework

  1. Download OMNeT++:
    • Download the OMNeT++ latest version.
  2. Install OMNeT++:
    • Based on the operating system install the OMNet++.
  3. Download and Install INET Framework:
    • The INET framework offers the design for internet protocols and is often used with OMNeT++.

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 proper options.
  2. Set Up Directory Structure:
    • Make sure the projects have the essential folders like src for source files and simulations for NED files and configuration.

Step 3: Define Wireless Sensor Network Models Using NED

  1. Create NED Files:
    • In the src directory, generate a novel NED file (e.g., WirelessSensorNetwork.ned).
    • Describe the network topology in the NED file. Here’s a simple example:

package wsn;

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 WirelessSensorNetwork

{

parameters:

int numSensors = default(20);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

sink: Router {

@display(“p=200,100”);

}

sensor[numSensors]: StandardHost {

@display(“p=300+100*i,200”);

mobility.typename = “RandomWaypointMobility”;

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numSensors-1 {

sensor[i].wlan[0] <–> radioMedium <–> sink.wlan[0];

}

}

Step 4: Implement Wireless Sensor Communication Logic in C++

  1. Create C++ Modules:
    • In the src directory, generate a new C++ class (e.g., SensorApp.cc).
    • Include necessary 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 SensorApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendSensorData();

void handleSensorData(cPacket *pkt);

};

Define_Module(SensorApp);

void SensorApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

// Initialization code

if (par(“sendPackets”).boolValue()) {

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

}

}

}

void SensorApp::handleMessageWhenUp(cMessage *msg)

{

if (msg->isSelfMessage()) {

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

sendSensorData();

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

}

} else {

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

handleSensorData(pkt);

}

}

void SensorApp::sendSensorData()

{

// Create and send a sensor data packet

EV << “Sending sensor data packet” << endl;

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

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

send(pkt, “lowerLayerOut”);

}

void SensorApp::handleSensorData(cPacket *pkt)

{

// Handle received sensor data packet

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

delete pkt;

}

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

network WirelessSensorNetwork

{

parameters:

int numSensors = default(20);

types:

channel radioChannel extends Ieee80211ScalarRadioMedium {}

submodules:

configurator: Ipv4NetworkConfigurator {

@display(“p=100,100”);

}

sink: Router {

@display(“p=200,100”);

}

sensor[numSensors]: StandardHost {

@display(“p=300+100*i,200”);

mobility.typename = “RandomWaypointMobility”;

@children:

udpApp: SensorApp {

localPort = 12345;

destPort = 54321;

startTime = uniform(0, 1s);

packetSize = 512B;

sendInterval = exponential(1s);

}

}

radioMedium: radioChannel {

@display(“p=400,100”);

}

connections allowunconnected:

for i=0..numSensors-1 {

sensor[i].wlan[0] <–> radioMedium <–> sink.wlan[0];

}

}

Step 5: Configure Simulation Parameters

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

network = WirelessSensorNetwork

sim-time-limit = 100s

**.sendPackets = true

**.startDelay = 1s

**.sendInterval = 2s

**.packetSize = 512B

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

Step 6: Build and Run the Simulation

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

Step 7: Analyse Results

  1. View Simulation Results:
    • After the simulation completes, use OMNeT++’s tools to evaluate the performance.
    • Open the ANF (Analysis Framework) to visualize and interpret the data.

In this entire script, we completely provide the procedures, sample snippets to compile the OMNet++ for wireless sensor network. We will give simulation results on how the wireless sensor network is executed with practical discussion.

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