WARPLab 7: Debugging Errors

This page shows various common error messages when using WARPLab 7 and offers suggestions on resolving the problem.

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Error using wl_transport_eth_udp_pnet/send (line 228)
maximum number of retransmissions met without reply from node

Error in wl_node/sendCmd (line 677)
            resp = obj.transport.send(cmd.serialize());

Error in wl_node/procCmd (line 644)
                    node.sendCmd(myCmd);

Error in wl_node/wl_nodeCmd (line 310)
                out(n) = currNode.procCmd(n, currNode, varargin{:});

Error in wl_node/applyConfiguration (line 160)
            obj.wl_nodeCmd('initialize');

Error in wl_initNodes (line 106)
        currNode.applyConfiguration(nodeIDs(n));

This error indicates that a WARP node didn't respond to repeated communication attempts from the wl_initNodes script.

Things to check:

• Did all WARP nodes boot successfully? On each node a green LED will blink while waiting for the Ethernet link, then all LEDs will turn off and the hex display will show the node's IP address suffix.
• Did you specify an invalid number of nodes or invalid node IDs in the arguments to {{{wl_initNodes}}?
• Does each WARP node have a unique ID? In the reference design IDs are assigned by setting the user DIP switch on the WARP node.
• Are all WARP nodes connected to a 1Gb Ethernet switch?

Debugging steps: To isolate which node is failing to communicate, you can use the optional wl_initNodes syntax to set node IDs explicitly:

wl_initNodes(1, 0); %initialize one node with ID 0
wl_initNodes(1, 1); %initialize one node with ID 1
wl_initNodes(1, 2); %initialize one node with ID 2
%continue until a node fails to initialize

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Error using wl_initNodes (line 154)
Broadcast triggers are not working. Please verify your ARP table has an entry for the broadcast
address on your WARPLab subnet

This error is printed by wl_initNodes when it is able to communicate with individual nodes, but nodes failed to receive a trigger packet.

Things to check:

• Are all WARP nodes and the host PC on a common Ethernet switch?
• Is the host PC NIC IP address in the same subnet as the WARP nodes (10.0.0.x by default)?

Debug steps: some PCs require a manual ARP table entry to allow broadcast IP packets. On Windows, open a command prompt as an admin user and run arp -s 10.0.0.255 ff-ff-ff-ff-ff-ff. Run arp -a to confirm the new entry was accepted. The output should look like:

Interface: 10.0.0.250 --- 0xd
  Internet Address    Physical Address     Type
  10.0.0.255          ff-ff-ff-ff-ff-ff    Static