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@startuml
scale 1.2

Client -> "Device Connection Service"++: 1.1 open
"Device Connection Service" -> Client- -: 1.2 open
Client -> "Device Connection Service"++: 2.1 attach(sender, target: "device_con/${tenant_id}")
"Device Connection Service" -> Client- -: 2.2 attach(receiver, source: "device_con/${tenant_id}")
Client -> "Device Connection Service"++: 3.1 attach(receiver, source: "device_con/${tenant_id}/${reply-to}")
"Device Connection Service" -> Client- -: 3.2 attach(sender, target: "device_con/${tenant_id}/${reply-to}")
@enduml

PlantUML version 1.2019.07beta1(Unknown compile time)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Java Version: 1.7.0_25-b15
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>