public function displayNwkAddrOfInterest()
 {
     return Buffer::displayInt16u($this->getNwkAddrOfInterest());
 }
 public function __toString()
 {
     $output = __CLASS__ . " (length: " . strlen($this->getFrame()) . ")" . PHP_EOL;
     $output .= "|- Status    : " . $this->displayStatus() . PHP_EOL;
     $output .= "|- IeeeAddr    : " . $this->displayIeeeAddressRemoteDev() . PHP_EOL;
     $output .= "|- NwkAddr     : " . $this->displayNwkAddrRemoteDev() . PHP_EOL;
     if ($this->getRequestType() == self::REQUEST_TYPE_EXTENDED && $this->getStatus() == Status::SUCCESS) {
         $output .= "|- NumAssocDev  : " . $this->getNumAssocDev() . PHP_EOL;
         if ($this->getNumAssocDev() != 0) {
             $output .= "`- StartIndex  : " . $this->displayStartIndex() . PHP_EOL;
             foreach ($this->getAssociatedDeviceList() as $assoc_dev) {
                 $output .= "  |- " . Buffer::displayInt16u($assoc_dev) . PHP_EOL;
             }
         }
     }
     return $output;
 }