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Всем привет. Есть код 

#include <EtherCard.h>
int outputPin = 6; // LED1 to pin 6
int anotherOutputPin = 7; // LED2 to pin 7
// ethernet interface mac address, must be unique on the LAN
static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };

byte Ethernet::buffer[700];
static uint32_t timer;
static uint32_t count;
static uint32_t all;

// called when a ping comes in (replies to it are automatic)
static void gotPinged (byte* ptr) {
  ether.printIp(">>> ping from: ", ptr);
}

void setup () {
  pinMode(outputPin, OUTPUT);
  pinMode(anotherOutputPin, OUTPUT);
  digitalWrite(anotherOutputPin, HIGH);
  digitalWrite(outputPin, HIGH);
  count=0;
  all=0;
   Serial.begin(57600);
  Serial.println("\n[pings]");
  if (ether.begin(sizeof Ethernet::buffer, mymac,10) == 0)
    Serial.println( "Failed to access Ethernet controller");
  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");
    ether.printIp("IP:  ", ether.myip);
  ether.printIp("GW:  ", ether.gwip);

  ether.parseIp(ether.hisip, "192.168.88.1");
//#endif
  ether.printIp("SRV: ", ether.hisip);
    
  // call this to report others pinging us
  ether.registerPingCallback(gotPinged);
  
  timer = -9999999; // start timing out right away
  Serial.println();
}

void loop () {
  word len = ether.packetReceive(); // go receive new packets
  word pos = ether.packetLoop(len); // respond to incoming pings
   if (len > 0 && ether.packetLoopIcmpCheckReply(ether.hisip)) {
    Serial.print("  ");
    Serial.print((micros() - timer) * 0.001, 3);
    Serial.println(" ms");
    count=0;
    all=0; 
}

   
  // ping a remote server once every few seconds
  if (micros() - timer >= 5000000) 
  {
    if ((ether.packetLoopIcmpCheckReply(ether.hisip))==0){
    count=count+1; } 
    ether.printIp("Pinging: ", ether.hisip);
     Serial.println("Count ");
     Serial.println(count);
      Serial.println("all ");
     Serial.println(all);
     timer = micros();
     ether.clientIcmpRequest(ether.hisip);
  if (count>5) 
    {
        digitalWrite(outputPin, LOW);    // turn the LED off by making the voltage LOW
        delay(20000);  
        digitalWrite(outputPin, HIGH);   // turn the LED on (HIGH is the voltage level)
        count=0;    
        all=all+1;
     }  
     if (all>2)
       digitalWrite(outputPin, LOW);  
 
  }
}

Не могу сообразить, как натравить ардуино на пинг нескольких устройств? Т.е. просто пингуем подряд несколько устройств и получаем от них ответы. Ну а дальше я уже сам анализиурю что с ними делать :)