How to implement energy model for underwater networks in unetstack?

Question

I want to implement energy model in unetstack, I know it's theory but don't know how to implement it in the unetstack as I'm still learning it. Please provide the steps involved in it. Basic code skeleton will also be helpful.

Expected Output : I expect the output that every node after transmitting/receiving packets, it prints out the remaining energy.

Answer 1

The most natural place to keep track of energy would be in the PHYSICAL (phy) agent. Assuming you are using the HalfDuplexModem phy in a UnetSim, I'd subclass it and monitor the TxFrameNtf and RxFrameNtf by overriding the send() method. I'd then add relevant energy attribute to keep track of the energy usage.

Example Groovy code:

import org.arl.fjage.Message
import org.arl.unet.sim.HalfDuplexModem

class MyHalfDuplexModem extends HalfDuplexModem {

  float energy = 1000   // change to whatever initial energy your node has

  @Override
  boolean send(Message m) {
    if (m instanceof TxFrameNtf) energy -= 10  // change according to your model
    if (m instanceof RxFrameNtf) energy -= 1   // change according to your model
    return super.send(m)
  }

}

Finally, in the simulation DSL, you can replace the default HalfDuplexModem by your customized version:

modem.model = MyHalfDuplexModem