Netgear Switch Discovery Protocol (NSDP) is a management protocol for several network device families, designed by Netgear.
Message body records are type–length–value (TLV) structures.
Type field may be one of following values in the table(list in incomplete): Network devices discovery (MAC-address an device model discovery): Device firmware update is made with TFTP protocol, but you need to send NSDP request to turn on TFTP-server first.