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Appendix A: New in OCPP 1.6

The following changes are made in OCPP 1.6 compared to OCPP 1.5 [OCPP1.5]:

  • Smart Charging is added
  • A binding to JSON over WebSocket as a transport protocol is added, reducing data usage and enabling OCPP communication through NAT routers, see: OCPP JSON Specification
  • Extra statuses are added to the ChargePointStatus enumeration, giving the CPO and ultimately end-users more information about the current status of a Charge Point
  • Structure of MeterValues.req is changed to eliminate use of XML Attributes, this is needed for support of JSON (no attribute support in JSON).
  • Extra values are added to the Measurand enumeration, giving Charge Point manufacturers the possibility to send new information to a Central System, such as the State of Charge of an EV
  • The TriggerMessage message is added, giving the Central System the possibility to request information from the Charge Point
  • A new Pending member is added to the RegistrationStatus enumeration used in BootNotification.conf
  • More and clearer configuration keys are added, making it clearer to the CPO how to configure the different business cases in a Charge Point
  • The messages and configuration keys are split into profiles, making it easier to implement OCPP gradually or only in part
  • Known ambiguities are removed (e.g. when to use UnlockConnector.req, how to respond to RemoteStart /Stop, Connector numbering)

A.1. Updated/New Messages:​

  • BootNotification.req
    • Change IccId and Imsi to CiString[] to enforce maximum lengths.
  • BootNotification.conf
    • heartbeatInterval to interval, interval now also used for other purposes than heartbeat, need to fix in spec
    • Added status Pending
  • ChargePointErrorCode
    • Added enumvalues: InternalError, LocalListConfict and UnderVoltage
    • Renamed enum value Mode3Error to EVCommunicationError
  • ChargePointStatus
    • Replaced enum value Occupied with the more detailed values: Preparing, Charging, SuspendedEVSE, SuspendedEV and Finishing
  • ChargingRateUnitType
    • New
  • ConfigurationStatus
    • Added enum RebootRequired
  • ClearChargingProfile.req
    • New
  • ClearChargingProfile.conf
    • New
  • DiagnosticsStatus
    • Added enum Uploading and Idle
  • FirmwareStatus
    • Added enum Downloading, Installing and Idle
  • GetCompositeSchedule.req
    • New
  • GetCompositeSchedule.conf
    • New
  • Location
    • Added enum Cable and EV
  • Measurand
    • Added enum Current.Offered, Frequency, Power.Factor, Power.Offered, RPM and SoC
  • MeterValues.req
    • overhaul of complex data structures
    • Added 'phase' field
  • ReadingContext
    • Added enum Trigger and Other
  • RemoteStartTransaction.req
    • Added ChargingProfile optional
  • SendLocalList.req
    • removed hash
  • SendLocalList.conf
    • removed hash
  • SetChargingProfile.req
    • New
  • SetChargingProfile.conf
    • New
  • StatusNotification.req
    • Overhaul of states
    • New error codes
    • Connector id 0 can only have status: Available, Unavailable and Faulted.
  • StopTransaction.req
    • added explicit and required stop reason
  • TriggerMessage.req
    • New
  • TriggerMessage.conf
    • New
  • UnlockConnector.conf
    • overhaul of UnlockStatus enum
  • UnitOfMeasure
    • Added Fahrenheit, K, Percent, VA, kVA
    • Rename Volt to V, Amp to A