@startuml Service

    participant OS                  as OS
    participant Script              as Script
    participant DD                  as DD
    participant TD                  as TD
    participant SW                  as SW
    participant UI                  as UI
    actor       USER                as US

    'Possible actions and interaction types
    ' External on CANBus
    ' TD -> SW: MSG: Message
    ' SW -> TD: MSG: Message

    ' Internal to the application
    ' XX -> YY: CMD: Command
    ' XX -> XX: ACT: Action

    ' External on OS/FS
    ' SW -> Script: ACT: Command
    ' Script -> OS: CMD: Command
    ' Script -> SW: MSG: Message
    ' OS -> Script: MSG: Message

    ' US -> UI: User actions are:
    '   ASK: Display a <message>
    '   ENT: User enters a value or string
    '   TCH: User touches a button (RadioButton, CheckBox, ...)
    '   SCL: User scrolls a flip-able area

    == Manufactoring Log In ==
    UI -> US: ACT: Manufactoring password screen
    US -> UI: ENT: Enter new password
    US -> UI: TCH: Confirm New password
    US -> UI: TCH: Shutdown

    == Service Log In ==
    US -> UI: TCH: Settings Menu Item
    UI -> US: ACT: Device Settings Screen
    US -> UI: TCH: Service Option
    UI -> US: ACT: Service Password Screen
    US -> UI: ENT: Enter Service Password
    US -> UI: TCH: Press Confirm
    UI -> SW: ACT: Check if matches hashed password \
                    \n\t-vSettings.isServicePasswordM
    alt Accepted
        SW -> UI: ACT: Notify UI password is correct
        UI -> UI: ACT: Navigate to Device Settings Screen
        SW -> TD: MSG: [xB0: #0] Request Service Mode
        TD -> SW: MSG: [xB1: #2]        \
                    \n\tResponse:       \
                    \n\t(U32)  mAccepted\
                    \n\t(U32)  mReason
        SW -> UI: ACT: Notify UI
        alt Accepted
            UI -> US: ACT: Display all service options
        else #Pink Rejected
            UI -> US: ACT: Display to user failure reason
        end
    else #Pink Rejected
        UI -> US: ACT: Display to user failure reason
    end

    == Date/ Time ==
    UI -> US: ACT: Device Settings Screen (Logged in with Service Password)
    US -> UI: TCH: Date/Time Option
    UI -> US: ACT: Date/Time  Screen
    US -> UI: ENT: Enter Date and Time
    US -> UI: TCH: Press Confirm
    UI -> SW: ACT: Set Date and Time
    group UI
        SW -> Script: ACT: date_time_set.sh ( )
        activate Script
            Script -> OS: CMD:                                          \
                            \n\tsudo timedatectl set-ntp "$ntp_flag"    \
                            \n\tsudo date -s "$new_time"                \
                            \n\tsudo hwclock -w

            OS -> Script: MSG: Exit Code
            Script -> SW: MSG: Exit Code
        deactivate Script
        alt successful ( exit == 0 )
            SW -> UI: ACT: Update Date and Time 
            UI -> US: ACT: Date/ TIme is updated per desired value
        else #Pink failed
            SW -> UI: ACT: Notify UI Script Error
            UI -> US: ACT: Notify user
        end
    end
    group TD
        SW -> TD: MSG: [x6C: #1] Set Date/ Time     \
                                \n\t(U32) mEpoch
        TD -> SW: MSG: [x6D: #2]                    \
                    \n\tResponse:                   \
                    \n\t(U32)  mAccepted            \
                    \n\t(U32)  mReason
        alt Accepted
            SW -> UI: ACT: Notify UI TD Date/Time has successful been set
        else #Pink Rejected
            SW -> UI: ACT: Notify UI TD Date/Time has failed to be set
        end
        UI -> US: ACT: Notify user
    end
    group DD
        SW -> DD: MSG: [x6E: #1] Set Date/ Time     \
                                \n\t(U32) mEpoch
        DD -> SW: MSG: [x6F: #2]                    \
                    \n\tResponse:                   \
                    \n\t(U32)  mAccepted            \
                    \n\t(U32)  mReason
        alt Accepted
            SW -> UI: ACT: Notify UI DD Date/Time has successful been set
        else #Pink Rejected
            SW -> UI: ACT: Notify UI DD Date/Time has failed to be set
        end
        UI -> US: ACT: Notify user
    end

    == Root SSH Access ==
    UI -> US: ACT: Device Settings Screen (Logged in with Service Password)
    US -> UI: TCH: Enable Root SSH Option
    UI -> US: ACT: Enable Root SSH Screen
    US -> UI: TCH: Touch enable SSH/ Root login switch
    UI -> SW: ACT: Set SSH/ Root login 
    SW -> Script: ACT: rootsshaccess.sh ( )
    activate Script
        Script -> OS: CMD: disable/enable SSH login and Root Login
        OS -> Script: MSG: set states of SSH/ Root Logins
        Script -> SW: MSG: SSH/ Root login states
    deactivate Script
    alt successful ( exit == 0 )
        SW -> UI: MSG: SSH/ Root login states
        UI -> UI: ACT: Update switch to reflect active enable states of SSH/ Root
    else #Pink failed
        SW -> UI: ACT: Notify UI Script Error
        UI -> US: ACT: Notify user
    end
    == Factory Reset ==
    UI -> US: ACT: Device Settings Screen (Logged in with Service Password)
    US -> UI: TCH: Factory Reset Option
    UI -> US: ACT: Factory Reset Screen
    US -> UI: TCH: Confirm button
    UI -> US: ACT: Prompt secondary confirmation popup (Are Youy Sure?)
    US -> UI: TCH: Confirm button
    UI -> SW: ACT: Perform Factory Reset
    SW -> Script: ACT: factory_reset.sh ( )
    activate Script
        Script -> OS: CMD: deleteWiFi               \
                        \n\t deleteBluetooth         \
                        \n\t defaultSettings         \
                        \n\t defaultBrightness       \
                        \n\t deleteLogFiles        
        OS -> Script: MSG: Exit Code
        Script -> SW: MSG: Exit Code
    deactivate Script
    alt successful ( exit == 0 )
        SW -> UI: MSG: Notify UI
        UI -> US: ACT: Notify User Factory Reset is complete
    else #Pink failed
        SW -> UI: ACT: Notify UI Script Error
        UI -> US: ACT: Notify user
    end
    == User Mode ==
    UI -> US: ACT: Device Settings Screen (Logged in with Service Password)
    US -> UI: TCH: User Modes Option
    UI -> US: ACT: User Modes Screen
    US -> UI: TCH: Touch professional mode switch
    UI -> SW: ACT: Set professional mode on or off
    SW -> OS: ACT: Write configuration in System.conf
    OS -> SW: ACT: Read configuration from System.conf
    SW -> UI: ACT: Notify UI
    UI -> UI: ACT: Update Sliding Switch
@enduml