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§From OCPP Specification
Central System can request a Charge Point to unlock a connector. To do so, the Central System SHALL send an UnlockConnector.req PDU.
The purpose of this message: Help EV drivers that have problems unplugging their cable from the Charge Point in case of malfunction of the Connector cable retention. When a EV driver calls the CPO help-desk, an operator could manually trigger the sending of an UnlockConnector.req to the Charge Point, forcing a new attempt to unlock the connector. Hopefully this time the connector unlocks and the EV driver can unplug the cable and drive away.
The UnlockConnector.req SHOULD NOT be used to remotely stop a running transaction, use the Remote Stop Transaction instead.
Upon receipt of an UnlockConnector.req PDU, the Charge Point SHALL respond with a UnlockConnector.conf PDU. The response PDU SHALL indicate whether the Charge Point was able to unlock its connector. If there was a transaction in progress on the specific connector, then Charge Point SHALL finish the transaction first as described in Stop Transaction.
UnlockConnector.req is intented only for unlocking the cable retention lock on the Connector, not for unlocking a connector access door.