How to Start STAR Protocol Projects Using OMNeT++

To start a Star Protocol project using OMNeT++ that encompasses to model and replicate the star network topology, which is generally utilised within wireless sensor networks (WSNs), IoT, or basic communication networks. The Star Protocol commonly signifies the interaction in which a central hub (coordinator) manages communication among the nodes.

Below is a sequential approach on how to get started:

Steps to Start STAR Protocol Projects in OMNeT++

  1. Understand Star Protocols
  • Star Topology:
    • Central hub like a base station or router that directly links to peripheral nodes (end devices).
    • Peripheral nodes interact via hub.
  • Use Cases:
    • Home automation systems.
    • Wireless sensor networks with a gateway node.
    • IoT networks including a central controller.
  1. Set Up OMNeT++
  • Install OMNeT++:
    • We should download and install the new version of OMNeT++ environment on the system.
    • Confirm and configure it to utilise example simulations.
  • Install INET Framework:
    • INET framework contains wireless communication and routing which is needed for a star protocol.
    • Copy the INET GitHub repository to download INET.
    • Execute and combine the INET with OMNeT++.
  1. Create a New OMNeT++ Project
  • Go to OMNeT++ IDE.
  • Create a New Project:
    • Select File > New > OMNeT++ Project.
    • Name it to the project like StarProtocolProject.
  • Link the project to the INET framework:
    • Right-click on the project, go to Properties > Project References, and then verify INET.
  1. Design the Star Network Topology
  • Create a star topology using a .ned file:

network StarNetwork {

submodules:

hub: WirelessHost {

@display(“p=300,300”);

}

node1: WirelessHost {

@display(“p=100,100”);

}

node2: WirelessHost {

@display(“p=500,100”);

}

node3: WirelessHost {

@display(“p=100,500”);

}

node4: WirelessHost {

@display(“p=500,500”);

}

connections allowunconnected:

node1.wlanRadio++ <–> hub.wlanRadio++;

node2.wlanRadio++ <–> hub.wlanRadio++;

node3.wlanRadio++ <–> hub.wlanRadio++;

node4.wlanRadio++ <–> hub.wlanRadio++;

}

  1. Configure Communication in omnetpp.ini
  • Basic Settings:

network = StarNetwork

sim-time-limit = 100s

*.hub.ipv4.address = “192.168.1.1”

*.node*.ipv4.address = “192.168.1.2-192.168.1.5”

  • Communication:
    • Set the nodes transmitting messages to the hub:

*.node*.applications[*].typename = “UdpBasicApp”

*.node*.applications[0].destAddress = “hub”

*.node*.applications[0].startTime = uniform(1s, 10s)

  1. Implement Custom Star Protocol Logic
  • Extend the Hub Module:
    • In C++ , make a custom hub module for managing:
      • Command dissemination (for IoT).
      • Message routing.
      • Data aggregation (for sensor networks).
  • Peripheral Nodes:
    • Inscribe custom logic for nodes to:
      • Transmit the periodic updates.
      • Reply to commands from the hub.
  1. Simulate and Debug
  • Run the Simulation:
    • We need to monitor the interaction among nodes and the hub.
  • Debugging:
    • Allow logging for in-depth insights:

*.hub.verbose = true

*.node*.verbose = true

  1. Analyze Performance
  • We need to estimate the crucial performance parameters such as:
    • Network throughput.
    • Hub utilization and load.
    • Packet delivery ratio.
    • End-to-end delay.
  • Transfer information into external OMNeT++’s tools for advanced analysis.
  1. Extend the Project
  • Add Features:
    • Fault-tolerant hub design.
    • QoS mechanisms to give precedence traffic.
    • Energy-efficient interaction for peripheral nodes.
  • Simulate Mobility:
    • For peripheral nodes, utilise a mobility model.

*.node*.mobility.mobilityType = “RandomWaypointMobility”

*.node*.mobility.speed = uniform(1mps, 5mps)

Example Scenario: Star Protocol for IoT Communication

  1. Central hub gathers sensor information from nodes.
  2. Nodes transmit updates occasionally to the hub.
  3. Hub executes and combines data for advanced transmission.

OMNeT++ provided an effective simulation process, allowing us to simulate and estimate the STAR Protocol Projects and we can extend this project as requirements are arise.

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