@startuml
skinparam shadowing false
title Before: heartbeat leaves through the home box

node "Master\netmaster.net:27950" as master
node "Home box\nhome IP" as box
node "Front\npublic IP" as front
node "ET server\n<et-server>:27960" as et

et --> box : heartbeat
box --> master : heartbeat (source = home IP)
master --> box : getChallenge\n(to home IP: dropped)
front ..> et : players (DNAT + wg + nginx stream)
@enduml