title Red Button flow R4

participant Dashboard
participant Ran\nLostConnection\nHandler as H
participant E2tInnstances\nManager as IM
participant Associaton\nManager as AM
participant Rnib\nDataService as RNIB
participant Routing\nManager as RM

Dashboard->H: handle
H->IM: GetE2TAddresses
alt no E2Ts
    loop for each RAN
        H->RNIB: GetNodeb
        note over H: Set Status = SHUT_DOWN\nassociatedE2t = ""
        H->RNIB: UpdateNodeb
    end
    H->Dashboard: ok
else There are E2Ts
    H->RM: DissociateAllRans
    loop for each RAN
        H->RNIB: GetNodeb
        note over H: Set Status = SHUTTING_DOWN\nassociatedE2t = ""
        H->RNIB: UpdateNodeb
    end
    H->IM: ClearRansOfAllE2TInstances
    H->RMR: RIC_SCTP_CLEAR_ALL
    note over H: Sleep till RMR responds...
    loop for each RAN
        H->RNIB: GetNodeb
        note over H: Set Status = SHUT_DOWN
        H->RNIB: UpdateNodeb
    end
    H->Dashboard: ok
end