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In the WARP Lab Matlab code, the sync Command is sent to both the receiver and transmitter thru Ethernet switch after the TX/RX commands are sent. This sync command is actually sent to the magic IP address which is already hardcoded in the two WARP boards. Here I don't know why the PC just need to send one UDP message with Sync command but two boards both received the sync command. Is there any protocol in the TCP/IP package decribing the usage of magic IP address?
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The sync packets are UDP packets sent to 10.0.0.244. The MAC address for this IP address is hardcoded to the broadcast Ethernet address (ff-ff-ff-ff-ff-ff), guaranteeing the Ethernet switch will forward the packet to every connected device. When a WARPLab node is waiting for a sync packet, it's actually waiting for a UDP packet addressed to 10.0.0.244. Every node receives this packet at the "same" time (there's always jitter, introduced by the Ethernet switch, varying cable lengths and asynchronous polling by the C code at each WARPLab node).
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