XCDX458000-00 rev A 37Communication ProtocolTo access the MAC address refer to GET MAC Address, page 44.4.3.4 UDP PORTSXCDX uses the following UDP ports:• 0x1745 (5957) is used for receiving regular XCDX commands andsending replies• 0x1E27 (7719) is used for receiving Discover command4.3.5 COMMAND AND REPLY STRUCTUREXCDX Ethernet protocol is based on UDP protocol. Each message sent to theXCDX and from XCDX is a UDP datagram complying with IPv4 standard.Figure 1: UDP ProtocolUDP header should specify destination port 0x1745 (5957).One command UDP datagram can comprise one or more XCDX commands(number in parenthesis specifies the field size in bytes):