/**
* Decode Variable Header
* Topic, Packet Identifier
*
* @param string & $packet_data
* @param int & $pos
* @return bool
*/
protected function decodeVariableHeader(&$packet_data, &$pos)
{
$topic = Utility::UnpackStringWithLength($packet_data, $pos);
$this->message->setTopic($topic);
if ($this->getQos() > 0) {
# Decode Packet Identifier if QoS > 0
$this->decodePacketIdentifier($packet_data, $pos);
}
return true;
}
