Busbroker is a custom modification of punybroker serving as the broker for a flight simulator build.

@startuml
package IO {
    [Main]
    package "IO Net" {
        [Server] -> [Client]
        [Client] -> [ClientRoute]
        [Socket] <-down-> [Server]
    }
    package "IO Routing" {
        [Router Manager] -> [Router]   
    }

    package "IO Config" {
        [Config]
    }
}

[Client] ..> [Router Manager] : SUB
[Client] ..> [Router] : PUB
[Router] ..> [ClientRoute] : PUB
[Socket] .down.> [Client] : RECV
[ClientRoute] .up.> [Socket] : SEND
[Main] -> [Server]
[Main] -> [Router Manager]
@enduml

Consider a simpler v2

• RequestQueue is derived in main, provided to sockets, handled by router
• Sockets create their own ResponseQueue and provide it to the router when subscribing

@startuml
[Main] -down-> [TCPServer] : fork
[Main] -down-> [Router]
[TCPServer]
interface accept
[TCPServer] -> [accept]
[accept] -> [Socket1]
[accept] -> [Socket2]
interface RequestQueue
[Socket1] -down-> [RequestQueue]
[Socket2] -up-> [RequestQueue]
[RequestQueue] -> [Router]

interface Socket1ResponseQueue
interface Socket2ResponseQueue
[Router] -up-> [Socket1ResponseQueue]
[Router] -down-> [Socket2ResponseQueue]
[Socket1] <- [Socket1ResponseQueue]
[Socket2] <- [Socket2ResponseQueue]
@enduml

@startuml
package Stacktrix {
[ModuleN] <-> [Gateway] : i2C
[Gateway] <-> [W5500] : SPI


}

package "Router Server" {
interface Sockets
Sockets <-> [PubSub Routing] : STM
[PubSub Routing] <-> [IO Mapping] : STM
}

W5500 <-right-> Sockets : TCP

interface Simulator 
Simulator <-up-> Sockets : TCP 
@enduml