Figure E.1

@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<sub>IN</sub>,P<sub>OUT</sub>]...

hostb_adm->hosta_adm:EVT_ADM_BIND [**UDP_CTR,P<sub>20</sub>**]

hosta_adm->hostb_adm:EVT_ADM_BIND [**UDP_CTR,P<sub>10</sub>**] 

note right : Pipe Session Open  on [P<sub>20</sub>,P<sub>10</sub>]

note left : Pipe Session Open on [P<sub>10</sub>,P<sub>20</sub>]

...

hostb_udp_ctr->hosta_udp_ctr: UDP-REQUEST-SOCKET-Command [Parameters...] on P<sub>10</sub>

activate hosta_udp_ctr

activate hostb_udp_ctr

hosta_udp_ctr-->hostb_udp_ctr: eUDP-OK [CTX_ID<sub>0001</sub>] on P<sub>20</sub> 

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 P<sub>10</sub>

activate hosta_udp_ctr

activate hostb_udp_ctr

hosta_udp_ctr->hostb_udp_ctr: EVT-DATAGRAM-IN-Event [Parameters...] on P<sub>20</sub>

deactivate hostb_udp_ctr

deactivate hosta_udp_ctr

hostb_adm->hosta_adm : EVT_ADM_RECEIVED

hosta_adm->hostb_adm : EVT_ADM_RECEIVED

hostb_adm->hosta_adm : EVT_ADM_CREDIT

hosta_adm->hostb_adm : EVT_ADM_CREDIT

end

else connection failure

hosta_udp_ctr->hostb_udp_ctr: EVT-ERROR-MESSAGE[CTX_ID<sub>0001</sub>, eUNREACHABLE]

end

@enduml