# dot -T png README.FlowHashEntry_FSM.dot -o flow.png

digraph finite_state_machine {
  rankdir=LR;
#  size="8,5"
  node [shape = circle];

  Allocated -> NotYetDetected [ label = "UDP Only: immediate state transition" ];
  Allocated -> ProtocolDetected [ label = "No TCP/UDP (e.g. ICMP)" ];
  Allocated-> NotYetDetected [ label = "TCP Only: when 3WH is completed" ];
  NotYetDetected -> ProtocolDetected [ label = "When nDPI detectes the application protocol, or after too many pkts "];
  Allocated -> ProtocolDetected [ label = "TCP Only: when 3WH is not completed but a FIN/RST has been observed. All: after 5 sec" ];
  ProtocolDetected -> Active [ label = "Lua Callback: protocolDetected" ];
  Active -> Active [ label = "Lua Callback: periodicUpdate (every 5 min), statusChange (only if the status changes)" ];
  Active -> Idle [ label = "TCP:FIN/RST+duration >= 15 sec, last_seen >= 1 min" ];
  Idle -> ReadyToBePurged [ label = ">= 24 sec since last packet seen, Lua Callback: flowEnd" ];
  ReadyToBePurged -> Deleted [ label = "Removed from memory (no Lua Callback)" ];
}