How to Start Bluetooth Topology Projects Using OMNeT++

To start a Bluetooth Topology project in OMNeT++, we will require replicating the Bluetooth interaction that normally includes a master-slave (piconet) structure or interconnected piconets (scatternet). OMNeT++ environment is optimal for simulations once OMNeT++ is combined with the INET framework and potential custom executions for Bluetooth-specific aspects. Following is a brief approach to get started:

Steps to Start Bluetooth Topology Projects in OMNet++

1. Set Up OMNeT++

1. Install OMNeT++:
   • Initially, we can download and install the new version of OMNeT++ on the system.
   • Confirm the installation by way of executing sample simulations.
2. Install INET Framework:
   • INET framework offers support for wireless interaction that can be adjusted simulation for Bluetooth.
   • We can download INET framework using GitHub and then compile it using OMNeT++.

2. Understand Bluetooth Topology

Bluetooth communication functions in:

• Piconet: One master and equal to 7 dynamic slaves.
• Scatternet: Several connected piconets.

Every single device can:

• Perform like a master controlling slave.
• It functions as a bridge among the piconets.

3. Define the Network Topology in NED

We need to create the Bluetooth topology to utilise NED (Network Description Language). A piconet can be denoted by a central master and numerous interconnected slaves.

Example: Basic Bluetooth Piconet

network BluetoothPiconet

{

submodules:

master: WirelessHost {

@display(“p=100,100;i=device/smartphone”);

}

slave[4]: WirelessHost {

@display(“p=200,100;i=device/sensor”);

}

connections allowunconnected:

master.wlan <–> slave[0].wlan;

master.wlan <–> slave[1].wlan;

master.wlan <–> slave[2].wlan;

master.wlan <–> slave[3].wlan;

}

4. Configure Simulation Parameters

Configure the Bluetooth-specific metrics using the omnetpp.ini file like interaction range, bandwidth, and energy settings.

Example Configuration:

network = BluetoothPiconet

sim-time-limit = 100s

 

# Physical layer settings

*.**.wlan.radio.transmitter.power = 2.5mW  # Bluetooth power

*.**.wlan.radio.transmitter.frequency = 2.4GHz

*.**.wlan.radio.transmitter.bandwidth = 1Mbps

*.**.mobility.typename = “StationaryMobility”  # Devices are static

# Traffic generation for communication

*.master.numApps = 1

*.master.app[0].typename = “UdpBasicApp”

*.master.app[0].destAddresses = “slave[2]”

*.master.app[0].messageLength = 512B

*.master.app[0].sendInterval = exponential(1s)

5. Implement Bluetooth Behavior

Bluetooth interaction needs certain logic for:

1. Device Discovery: Permit the devices for determining and associating.
2. Master-Slave Communication:
   • The master manages the scheduling and allocates time slots to slaves.
3. Inter-Piconet Bridging:
   • If replicating a Scatternet then we execute the devices performing like bridges.

Example C++ Implementation:

void BluetoothNode::handleMessage(cMessage *msg) {

if (isMaster) {

// Handle master-specific logic

scheduleCommunication(msg);

} else {

// Handle slave-specific logic

respondToMaster(msg);

}

}

void BluetoothNode::scheduleCommunication(cMessage *msg) {

// Logic for assigning time slots to slaves

send(msg, “out”);

}

6. Add Traffic Generation

We will need to replicate the data exchange among devices to utilise application components such as UdpBasicApp or TcpApp.

Example Traffic Configuration:

*.slave[1].numApps = 1

*.slave[1].app[0].typename = “UdpBasicApp”

*.slave[1].app[0].destAddresses = “master”

*.slave[1].app[0].messageLength = 256B

*.slave[1].app[0].sendInterval = exponential(2s)

7. Simulate and Visualize

1. Run the Simulation:
   • Run the project simulation using the OMNeT++ IDE and then monitor the Bluetooth topology.
   • Envision piconet and scatternet interaction.
2. Debug and Validate:
   • Make sure proper behavior to utilise message inspection and logging.

8. Analyze Results

• Metrics to Monitor:
  • Device energy utilization.
  • End-to-end latency.
  • Packet delivery ratio.
• Network Behavior:
  • Monitor the network behavior like master-slave interaction effectiveness and inter-piconet bridging performance.

9. Extend the Project

• Scatternet Simulation:
  • Prolong the scatternet simulation by means of interconnecting several piconets with the help of bridge nodes.
• Mobility:
  • Mimic mobile Bluetooth devices to utilise RandomWaypointMobility.
• Energy Modeling:
  • Execute the power utilization and energy-saving mechanisms such as sniff mode.
• Dynamic Behavior:
  • Replicate the devices actively connecting or exiting piconets.

10. Document and Present Results

• Topology Diagrams:
  • It offers Bluetooth topology (piconet or scatternet) diagrams.
• Performance Metrics:
  • Deliver graphs and tables for crucial performance parameters like throughput, latency, and power utilization.

Example Use Cases

1. IoT Device Communication:
   • We need to replicate the sensor nodes that interconnecting with a central hub.
2. Home Automation:
   • Design Bluetooth-controlled devices within a smart home automation.
3. Wearable Networks:
   • Replicate a piconet for wearable devices, which is interacting with a smartphone.

Following these steps, you’ll make and simulate the Bluetooth Topology in OMNeT++ that contains basic sets up and integrate complexity to suit research or project goals. We have the opportunity to expand the project to study more insights on this topic through another manual.