@startuml WaterSample

    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

    == Navigate to popup ==
    US -> UI: TCH: Press Water Sample headerbar icon button
    UI -> UI: ACT: Water Sample Popup is displayed

    == Water Sample Tab ==
    US -> UI: TCH: Select Water Sample tab
    US -> UI: TCH: Enter Water Sample chlorine sample result value
    US -> UI: TCH: Press Confirm
    UI -> SW: ACT: Send TD Water Sample chlorine sample result value
    SW -> TD: MSG: [xA3: #1] Req \n TD Water Sample Result Request \
                            \n\t(F32)  mResult       
    TD -> SW: MSG: [xAB: #1] Rsp \n TD Water Sample Result Response \
                            \n\t(F32)  mResultValue    
    SW -> UI: CMD: Update Water Sample Result\n(F32) mResultValue
    UI -> US: ACT: Show last result value and timestamp
   
    == Water Sample Data ==
    TD -> SW: MSG: [xAC: #2] \nTD Broadcast\n(U32) mValve\n(U32) mTimeout
    SW -> UI: CMD: Update Water Sample Data\n(U32) mValve\n(U32) mTimeout
    UI -> US: ACT: Upate Water sample dialog \
                \n\t mValve will show either primary or secondary \
                \n\t mTimeout will trigger the popup to automatically open on 4 hour FW timeout

    == Dialsate Check Tab ==
    US -> UI: TCH: Select Dialysate Check tab
    UI -> US: ACT: Display Dialysate data \
                \n\tAcid Concentrate \
                \n\tBicarbonate Cartridge Size \
                \n\tSodium\
                \n\tBicarbonate \
                \n\tTheoretical Conductivity \
                \n\tindependant Conductivity Reading 1\
                \n\tindependant Conductivity Reading 2\
                \n\tDialysate Temperature \
                \n\tActual RO Rejection Percentage
@enduml