How to Implement Network Context Aware Systems in OMNeT++

To implement the Network Context Aware Systems in OMNeT++ encompasses crafty and emulation the network that to adjust to this behaviour established on the context like user requirements, current network conditions or situational factors. It improve the performance and efficiency of the network to creating it huge responsive to moving conditions.

The following steps are to implementing the Network Context Aware Systems in OMNeT++ by using the INET framework:

Step-by-Step Implementations:

Install OMNeT++ and INET Framework

Make sure to install the OMNeT++ and the INET Framework.

Set up the Development Environment

To want to extra libraries or tools for context awareness, like machine learning libraries if using Python or specific OMNeT++ modules for collecting network metrics.

Create a New OMNeT++ Project

Open OMNeT++ IDE: Start the OMNeT++ IDE.
Create a New Project: Go to File -> New -> OMNeT++ Project. Name the project like ContextAwareNetworkSimulation.

Define the Network Topology

To express the network topology to make a new NED file.

Example: Context Aware Network Topology (ContextAwareNetwork.ned)

package contextawarenetwork;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network ContextAwareNetwork

{

parameters:

@display(“bgb=800,400”);

submodules:

host1: StandardHost {

@display(“p=100,200”);

}

host2: StandardHost {

@display(“p=300,200”);

}

router: Router {

@display(“p=200,100”);

}

connections:

host1.ethg++ <–> Eth10M <–> router.ethg++;

host2.ethg++ <–> Eth10M <–> router.ethg++;

}

Configure the Simulation

To configure the restrictions of the simulation to build an OMNeT++ initialization file.

Example: Configuration File (omnetpp.ini)

[General]

network = contextawarenetwork.ContextAwareNetwork

sim-time-limit = 100s

# Visualization

*.visualizer.canvasVisualizer.displayBackground = true

*.visualizer.canvasVisualizer.displayGrid = true

# Host Configuration

*.host*.numApps = 1

*.host*.app[0].typename = “HostApp”

*.host*.app[0].destAddresses = “router”

*.host*.app[0].destPort = 5000

*.host*.app[0].messageLength = 1024B

*.host*.app[0].sendInterval = 1s

# Router Configuration

*.router.numApps = 1

*.router.app[0].typename = “RouterApp”

*.router.app[0].localPort = 5000

# UDP Configuration

*.host*.hasUdp = true

*.router.hasUdp = true

# IP Address Configuration

*.host1.ipv4.config = xmldoc(“host1.xml”)

*.host2.ipv4.config = xmldoc(“host2.xml”)

*.router.ipv4.config = xmldoc(“router.xml”)

Create IP Address Configuration Files

To state the IP address configuration for the every node to make XML files.

Example: IP Configuration File for host1 (host1.xml)

</interface>

</config>

Example: IP Configuration File for host2 (host2.xml)

</interface>

</config>

Example: IP Configuration File for router (router.xml)

</interface>

</config>

Implement Context-Aware Application Logic

To put on context-aware functionalities, requirement to execute the logic for monitoring context, making decisions, and adapting conduct. It is comprise using exterior scripts or AI representations.

Example: Host Application with Context Awareness (Pseudo-Code)

#include <omnetpp.h>

#include <cstdlib>

#include <cstdio>

using namespace omnetpp;

class HostApp : public cSimpleModule

{

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

private:

void sendData();

void adaptToContext();

};

Define_Module(HostApp);

void HostApp::initialize() {

// Initialization code

scheduleAt(simTime() + uniform(0, 1), new cMessage(“sendData”));

}

void HostApp::handleMessage(cMessage *msg) {

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

sendData();

adaptToContext();

scheduleAt(simTime() + 1, msg);

} else {

// Handle other messages

}

void HostApp::sendData() {

// Logic to send data

cMessage *msg = new cMessage(“data”);

send(msg, “out”);

}

void HostApp::adaptToContext() {

// Call external script for context-aware decision-making

system(“python3 context_aware_model.py”);

}

Example: Router Application with Context Awareness (Pseudo-Code)

#include <omnetpp.h>

using namespace omnetpp;

class RouterApp : public cSimpleModule

{

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

private:

void processData(cMessage *msg);

void adaptToContext();

};

Define_Module(RouterApp);

void RouterApp::initialize() {

// Initialization code

}

void RouterApp::handleMessage(cMessage *msg) {

// Process data and adapt to context

processData(msg);

adaptToContext();

}

void RouterApp::processData(cMessage *msg) {

// Logic to process data

delete msg; // Example: simply delete the message after processing

}

void RouterApp::adaptToContext() {

// Call external script for context-aware decision-making

system(“python3 context_aware_model.py”);

}

Example: Context-Aware Model Script (context_aware_model.py)

import random

def context_aware_decision():

# Dummy context-aware decision logic

decision = random.choice([“increase_rate”, “decrease_rate”, “maintain_rate”])

print(f”Context-Aware Decision: {decision}”)

return decision

if __name__ == “__main__”:

context_aware_decision()

Run the Simulation

Build the Project: Right-click on the project and handpicked Build Project.
Run the Simulation: To connect on the green play button in the OMNeT++ IDE to start the simulation.

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