DataTransfer messages send from Central system to the Charge point
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We are using different vendor codes (some where designed specially fo particular partner).
We have listed only those those publically available where Etrel vendor code is used:

Etrel
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 - SetChargingMode
    Is used for changing charging mode and departure time remotely. Charger uses tow modes: Fast and Interactive (Smart). 
    Normally this message is used when changing departure time or mode on the app, where this info is trasffered to the charger LCD display.
    Paramaters:
      connectorId
      transactionId (not mandatory)
      chargingMode  (possible values: Fast, Smart)
      departureTime (not mandatory, format is ISO time)

 - SetChargingRateKmPerKWh
    Is used when charger displays to the customer number of charged kilometers during charging session. Basically is is a ratio how many km it can make with 1 kWh.
    In some cases central system knows what kind of vehicle is used by the customer and adopts this ratio for customer vehicle.
    If ration not provided then INCH default ratio is takes. Normally this paramater is set just after new session started if charger used by multiple customers. 
    If used only by one customer, then it is set after charger bootup or when vehicle changed.
    Paramerers:
      connectorId
      transactionId (not mandatory)
      rate 
     
 - CreditCardChargingStartedOnSatelliteCharger
    It is used only on INCH DUO equpped with credit cards payment terminal, when credit card payment enabled.
    Please check more information in credit card payment documentation.
    
 - CreditCardTransactionBillingData
    It is used only on INCH DUO equpped with credit cards payment terminal, when credit card payment enabled.
    Please check more information in credit card payment documentation.

 - TxLimit
    It is used when central system would like to limit charging session. Limitation can be set due to the customer request, funds limitation or general charging service limitation.
    Normally this message is send after session is started and transactionId is known. Central system calculates session limits shortly after started. 
    Limits can also be changed several times during the session.
    Paramaters:
      transactionId
      energyLimit   (unit is Wh)
      durationLimit (format is TimeSpan - "d.HH:mm:ss")
      SOCLimit   **not implemented yet
      

 
 
DataTransfer messages send from Charge point to the Central system 
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Etrel
 - ChargingModeChanged
    Message is send when charging mode or departure time changes on the charger. Departure time can be changed by the customer or can be changed also by other charger interfaces like: Modbus or Web.
    Since session is running when change occurs, all listed paramaters will be provided. 
    Paramaters: 
      connectorId
      transactionId
      chargingMode	(possible values: Fast, Smart)
      departureTime (format is ISO time)
      timestamp

 - CreditCardResolveConnector 
    It is used only on INCH DUO equpped with credit cards payment terminal, when credit card payment enabled.
    Please check more information in credit card payment documentation.
 
 - CreditCardPreauthorizationStatus    
    It is used only on INCH DUO equpped with credit cards payment terminal, when credit card payment enabled.
    Please check more information in credit card payment documentation.

 - CreditCardSettlementStatus
    It is used only on INCH DUO equpped with credit cards payment terminal, when credit card payment enabled.
    Please check more information in credit card payment documentation.