I made a simple patch to the server.js source code to display internal messages as the occur…
$ node debugserver.js
Express server listening on port 8080
connection detected
handleControlMessage: {"status":"register","id":"judge0","secret":"judge0secret"}
validate: {"status":"register","id":"judge0","secret":"judge0secret"}
connection detected
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
( Repeats many times… )
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
handleDisconnect: transport close
connection detected
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
( Repeats many times… )
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
connection detected
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
handleControlMessage: {"status":"register","id":"ai0","secret":"ai0secret"}
validate: {"status":"register","id":"ai0","secret":"ai0secret"}
handleControlMessage: {"status":"roundStatus","id":"ai0","secret":"ai0secret"}
validate: {"status":"roundStatus","id":"ai0","secret":"ai0secret"}
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
( Repeats many times… )
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
handleCommunicationMessage: {"contents":"You chatted: hello","id":"ai0","secret":"ai0secret"}
validate: {"contents":"You chatted: hello","id":"ai0","secret":"ai0secret"}
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
( Repeats many times… )
handleControllerMessage: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
validate: {"status":"statusUpdate","id":"CONTROLLER","secret":"CP0secret"}
handleCommunicationMessage: {"contents":"hello","id":"judge0","secret":"judge0secret"}
validate: {"contents":"hello","id":"judge0","secret":"judge0secret"}
/var/www/html/LPC2/debugserver.js:88
  return config.rounds[round][0][judgeNumber];
                             ^
TypeError: Cannot read property ‘0’ of undefined
    at getConfederateForJudge (/var/www/html/LPC2/debugserver.js:88:30)
    at getConfederateForJudgeByName (/var/www/html/LPC2/debugserver.js:108:29)
    at handleCommunicationMessage (/var/www/html/LPC2/debugserver.js:228:28)
    at Socket.<anonymous> (/var/www/html/LPC2/debugserver.js:349:38)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at /var/www/html/LPC2/node_modules/socket.io/lib/socket.js:509:12
    at nextTickCallbackWith0Args (node.js:419:9)
    at process._tickCallback (node.js:348:13)

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