xbee: Receiving data in interrupts

XBee & XBee Gateway XBee - 802.15.4
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1

I am trying to establish XBee communication using API mode. I wanted to get the data received by XBee using Interrupts. I am using the below code but i could not read data. can any one suggest some way of reading data received by XBee using Interrupts

#include 
#include 
#include 
#include 
 
XBee xbee = XBee();
XBeeResponse response = XBeeResponse();
ZBRxResponse rx = ZBRxResponse();
SoftwareSerial test(2,1);
String sample;
void setup() {
 Serial.begin(9600);
 xbee.begin(test);
 attachInterrupt(0, receiveData, CHANGE  );
}
 
void receiveData() {
 
 xbee.readPacket();
 if (xbee.getResponse().isAvailable()) {
  if (xbee.getResponse().getApiId() == ZB_RX_RESPONSE) {
    xbee.getResponse().getZBRxResponse(rx);
      for (int i = 0; i < rx.getDataLength(); i++) {
        sample += (char)rx.getData(i);
      }
   }
 }else if (xbee.getResponse().isError()) {
     sample += xbee.getResponse().getErrorCode();
 }
 
}
 
void loop() {
Serial.println(sample);
delay(1000);  
}
2

When you refer to an interrupt are you referring to an IO line or the UART data port?