@startuml skinparam monochrome true skinparam defaultFontName Arial skinparam classFontSize 10 skinparam sequenceBoxBorderColor #black participant "**Host A**\nUDP Control Service Gate" as hosta_udp_ctr participant "**Host A**\nAdministration Gate" as hosta_adm participant "**Host B**\nAdministration Gate" as hostb_adm participant "**Host B**\nUDP Control Application Gate" as hostb_udp_ctr autonumber ...**Notation:** Gate Identifier : Pipe Session Open on [P_IN,P_OUT]... hostb_adm->hosta_adm:EVT_ADM_BIND [**UDP_CTR,P₂₀**] hosta_adm->hostb_adm:EVT_ADM_BIND [**UDP_CTR,P₁₀**] note right : Pipe Session Open on [P₂₀,P₁₀] note left : Pipe Session Open on [P₁₀,P₂₀] ... hostb_udp_ctr->hosta_udp_ctr: UDP-REQUEST-SOCKET-Command [Parameters...] on P₁₀ activate hosta_udp_ctr activate hostb_udp_ctr hosta_udp_ctr-->hostb_udp_ctr: eUDP-OK [CTX_ID₀₀₀₁] on P₂₀ deactivate hostb_udp_ctr deactivate hosta_udp_ctr ... alt Socket Opened Successfully ... loop hostb_udp_ctr->hosta_udp_ctr: EVT-DATAGRAM-OUT-Event [Parameters...] on P₁₀ activate hosta_udp_ctr activate hostb_udp_ctr hosta_udp_ctr->hostb_udp_ctr: EVT-DATAGRAM-IN-Event [Parameters...] on P₂₀ deactivate hostb_udp_ctr deactivate hosta_udp_ctr end else connection failure hosta_udp_ctr->hostb_udp_ctr: EVT-ERROR-MESSAGE[CTX_ID₀₀₀₁, eUNREACHABLE] end @enduml