Set smart charging profiles to control charge limits on EVSE using OCPP

Steps

1. Deploy or connect to an OCPP-compliant Central System (CS) that accepts WebSocket connections from charge points; establish the WebSocket connection from the EVSE using the endpoint URL format ws://<CS_HOST>/ocpp/<CHARGE_POINT_ID> with subprotocol 'ocpp1.6' or 'ocpp2.0.1'.
2. After the charge point sends a BootNotification and the CS responds with Accepted, send a SetChargingProfile request from the CS to the charge point specifying the connectorId (0 for station-wide, or a specific connector number).
3. Construct the ChargingProfile object with chargingProfileId, stackLevel, chargingProfilePurpose (e.g., TxDefaultProfile for default transaction limits or TxProfile for a specific transaction), chargingProfileKind (Absolute, Recurring, or Relative), and a ChargingSchedule.
4. In the ChargingSchedule, set chargingRateUnit (A for amperes or W for watts), optionally a duration, and a chargingSchedulePeriod array where each period has startPeriod (seconds from schedule start) and limit (max current in A or power in W).
5. Handle the SetChargingProfile response: a status of 'Accepted' confirms the profile is active; implement ClearChargingProfile to remove profiles and GetCompositeSchedule to inspect what the charge point will actually follow given all stacked profiles.