使用Unetstack和Groovy脚本查找两个节点之间的距离

Question

我正在基于相邻节点之间的距离为水下通信网络实现路由协议。我创建了一个代理，并编写了一个脚本，以使用测距代理查找相邻节点之间的距离，但出现错误

  

没有这样的属性：类别：。

我将附加我编写的脚本。

1. 3-node-network_test.groovy：这是一个仿真脚本，其中部署了3个节点。节点1是接收器节点，将在其中执行测距代理和接收器脚本。 节点2和3正在运行“范围代理”和“ node_agent”。
2. sink.groovy：将通过广播信标来初始化信标处理。
3. node_agent：它从接收器接收信标并标识到接收器的距离。在这里，我编写了脚本来查找下沉的距离：

---

完整的脚本。如何在unetstack中找到距离？

3-node-network_test.groovy：

//! Simulation: Simple 3-node network
import org.arl.fjage.*


// run the simulation forever
simulate {
  node '1', remote: 1101, address: 1, location: [ 0.km, 0.km, -15.m], shell: true, stack: {container ->
    container.add 'ranging', new org.arl.unet.phy.Ranging()   
    container.shell.addInitrc "${script.parent}/sink.groovy"
  }
  node '2', remote: 1102, address: 2, location: [ 1.km, 0.km, -15.m], shell: 5102, stack: {container ->
    container.add 'ranging', new org.arl.unet.phy.Ranging();
    //container.shell.addInitrc "${script.parent}/sink.groovy"
    container.add 'node_agent', new node_agent();
  }
  node '3', remote: 1103, address: 3, location: [-1.km, 0.km, -15.m], shell: 5103, stack: { container ->
    container.add 'ranging', new org.arl.unet.phy.Ranging()
    container.add 'node_agent', new node_agent();    
  }
}

Sink.groovy：

import org.arl.unet.*
import org.arl.unet.phy.*
import org.arl.unet.mac.*
//import org.arl.unet.nodeinfo.NodeInfo
import org.arl.unet.PDU 
import org.arl.fjage.*
import static org.arl.unet.Services.*
import static org.arl.unet.phy.Physical.*
import org.arl.unet.phy.Ranging.*


int hc = 0, ad;
float neighbor_dist;
float rang

subscribe phy;
send = { count = 1 ->

    println ''' BROADCASTING '''
    count.times {

          phy << new DatagramReq(to: Address.BROADCAST, protocol: Protocol.MAC, data: [node.address, hc, 0]);

        }

}

node_agent.groovy：

import org.arl.fjage.Message
import org.arl.unet.*
import org.arl.unet.net.Router
import org.arl.unet.phy.*
import org.arl.unet.mac.*
import org.arl.fjage.RealTimePlatform
import org.arl.unet.nodeinfo.NodeInfo
import org.arl.fjage.*
import org.arl.unet.phy.Ranging.*
import org.arl.unet.phy.RangeNtf.*
import org.arl.unet.phy.RangeReq 


class node_agent extends UnetAgent {
  int neighbor, addr;
    float neighbor_distance;

    void startup() 
    {

      def phy = agentForService Services.PHYSICAL;
      subscribe topic(phy);

      def rang = agentForService Services.RANGING;
      subscribe topic(rang);

      def nodeInfo = agentForService Services.NODE_INFO;
      addr = nodeInfo.address;

    }

    void processMessage(Message msg) {

    if (msg instanceof DatagramNtf && msg.protocol == Protocol.MAC)
    {     
      neighbor = msg.from;
      println " BEACON RECEIVED FROM:" +neighbor
      ranging<< new RangeReq(to: neighbor);   

      }

    else if (msg instanceof RangeNtf )
    {   

        float neighbor_distance = msg.getRange();
        println " Distance between node "+addr + " and neighbor" +neighbor+ "is" + neighbor_dis

    }  // End of if*/
    else {

    }
   }  //End of process message
}

Answer 1

RangeReq需要发送到测距代理。您可以使用agentForService Services.RANGING获取代理。由于无论如何都在startup()中查找它，因此可以将其存储在一个属性中，以后再使用它来请求范围。像这样：

def ranging

void startup() 
{
         :
      ranging = agentForService Services.RANGING;
         :
}

void processMessage(Message msg)
{
      if (msg instanceof DatagramNtf && msg.protocol == Protocol.MAC)
      {     
        neighbor = msg.from;
        println " BEACON RECEIVED FROM:" +neighbor
        ranging << new RangeReq(to: neighbor);
      }
      else if (msg instanceof RangeNtf )
      {   
        float neighbor_distance = msg.getRange();
           :
     }
   }
}