1@startuml 2hide footbox 3participant Initiator 4participant Responder 5 6== preparation == 7 8Initiator <- Responder : [s] 9 10== interactive == 11 12Initiator -> Responder : [e, es, s, ss], INFO..., HALT... 13Initiator <- Responder : [e, ee, se], INFO..., HALT... 14Initiator -> Responder : INFO..., FREQ..., DONE... 15Initiator <- Responder : INFO..., FREQ..., DONE... 16Initiator -> Responder : FILE..., INFO..., DONE..., PING 17Initiator <- Responder : FILE..., INFO..., DONE..., PING 18 19@enduml 20