sequenceDiagram
    autonumber
    participant User as User
    participant App as App Process
    participant Srv as Lanthing Server
    participant Svc as Service Process
    participant Sess as WorkerSession
    participant Wkr as Worker Process
    participant Sig as Signaling Service
    participant Cli as Client Process
    participant Tp as Transport RTC/TCP

    User->>App: Launch app and request remote control
    App->>Srv: RequestConnection(peerDeviceID, token)
    Srv->>Svc: OpenConnection(streaming params)
    Svc->>Sess: Create session
    Sess->>Wkr: Start worker(action=streaming)
    Wkr-->>Sess: Ready
    Svc-->>Srv: OpenConnectionAck
    Srv-->>App: RequestConnectionAck

    par Join signaling
        Sess->>Sig: Join room(controlled)
    and Start requester side
        App->>Cli: Spawn client process
        Cli->>Sig: Join room(requester)
    end

    Sig-->>Sess: SignalingMessage(sdp/candidate)
    Sig-->>Cli: SignalingMessage(sdp/candidate)
    Sess->>Tp: Build server transport
    Cli->>Tp: Build client transport
    Tp-->>Sess: Connected(link type)
    Tp-->>Cli: Connected(link type)

    Cli->>Sess: StartTransmission
    Sess-->>Cli: StartTransmissionAck

    loop Normal streaming
        Wkr->>Sess: Video/audio frames
        Sess->>Cli: Media frames
        Cli-->>Sess: Input events and control
        Sess-->>Cli: KeepAliveAck and stats
    end

    alt Transport interruption detected
        Tp-->>Cli: Disconnected / degraded
        Tp-->>Sess: Disconnected / degraded
        Cli->>Sig: Rejoin room and resend signaling
        Sess->>Sig: Rejoin room and resend signaling
        Sig-->>Cli: New signaling payload
        Sig-->>Sess: New signaling payload
        Cli->>Tp: Recreate transport client
        Sess->>Tp: Recreate transport server
        Tp-->>Cli: Reconnected(new link type)
        Tp-->>Sess: Reconnected(new link type)
        Cli->>Sess: StartTransmission(recover)
        Sess-->>Cli: StartTransmissionAck(recover)
        Note over Cli,Sess: Resume streaming without restarting app/service
    else Reconnect failed
        Sess->>Svc: Session closed(reason=reconnect_timeout)
        Svc->>App: DisconnectedConnection
        App-->>User: Show reconnect failed and prompt retry
    end