Connect a charge point to a Central System (CSMS) using OCPP 1.6J (JSON over WebSocket)

Steps

1. On the charge point, configure the CSMS WebSocket URL in the format wss://<csms-host>/<path>/<chargepoint-id>; the charge point ID becomes the last path segment and must match what the CSMS expects
2. After the WebSocket connection is established, the charge point sends a BootNotification request (action BootNotification, payload with chargePointModel and chargePointVendor); the CSMS responds with status Accepted and a heartbeatInterval
3. The charge point begins sending Heartbeat messages at the interval specified in the BootNotification response; the CSMS replies with currentTime to keep clocks synchronized
4. When a user initiates a session, the charge point sends Authorize (with idTag), then StartTransaction (with connectorId, idTag, meterStart, timestamp); the CSMS responds with transactionId
5. On session end, the charge point sends StopTransaction with the transactionId, meterStop, and a reason; the CSMS validates and closes the transaction