description: This interface defines a generic powermeter for 5 wire TN networks.
cmds:
  start_transaction:
    description: Starts a transaction on the power meter (for signed metering according to German Eichrecht)
    arguments:
      value:
        description: All information that should be included in the signed OCMF packet
        type: object
        $ref: /powermeter#/TransactionReq
    result:
      description: True on success, False if transaction could not be started in the power meter
      type: object
      $ref: /powermeter#/TransactionStartResponse
  stop_transaction:
    description: >-
      Stop the transaction on the power meter and return the signed metering information.
      If the transaction id is an empty string, all ongoing transaction should be cancelled.
      This is used on start up to clear dangling transactions that might still be ongoing
      in the power meter but are not known to the EvseManager.
    arguments:
      transaction_id:
        description: Transaction id
        type: string
    result:
      description: Response to transaction stop request including OCMF string.
      type: object
      $ref: /powermeter#/TransactionStopResponse
vars:
  powermeter:
    description: Measured dataset
    type: object
    $ref: /powermeter#/Powermeter
  public_key_ocmf:
    description: The public key for OCMF
    type: string
errors:
  - reference: /errors/powermeter