code: public function findVmac($ipv4) {
  		$vmacs = json_decode(self::getClient()->getVmacs($this->getDomain()));
  		foreach($vmacs as $vmac) {
  			$test_ip = json_decode(self::getClient()->getVmacIPAddresses($this->getDomain(),$vmac));
  			foreach($test_ip as $ip) {
  				if ($ip == $ipv4)
  					return $vmac;
  			}
  		}
  		return "";
  	}
docs: /*
  function to lookup a vMac based on an IP address - why dont they include this in the API?
  
  @param $ipv4 - IPv4 to lookup
  
  @returns vmac or null string if not found