BootNotification

The first message a charge point sends after connecting. Identifies the hardware and asks the CSMS for a heartbeat interval.

Version: OCPP 1.6
Direction: Charge Point → CSMS
Feature profile: Core

BootNotification also exists in OCPP 2.0.1, with a different payload. See the OCPP 2.0.1 version.

BootNotification is the handshake that follows the WebSocket handshake. Until the CSMS answers with Accepted, the charge point is not permitted to send any other message except Heartbeat — it is not yet part of the network.

The response also carries the heartbeat interval and the CSMS's current time, which is how most chargers set their clock.

Request

Field	Type	Required	Description
`chargePointVendor`	CiString20	Required	Manufacturer name. Required.
`chargePointModel`	CiString20	Required	Model name. Required.
`chargePointSerialNumber`	CiString25	Optional	Serial number of the charge point.
`chargeBoxSerialNumber`	CiString25	Optional	Deprecated in 1.6. Serial number of the charge box.
`firmwareVersion`	CiString50	Optional	Firmware currently installed.
`iccid`	CiString20	Optional	ICCID of the modem's SIM card.
`imsi`	CiString20	Optional	IMSI of the modem's SIM card.
`meterType`	CiString25	Optional	Type of the main power meter.
`meterSerialNumber`	CiString25	Optional	Serial number of the main power meter.

json

[2, "19223201", "BootNotification", {
  "chargePointVendor": "AcmeCharging",
  "chargePointModel": "AC22-Duo",
  "chargePointSerialNumber": "SN-0001234",
  "firmwareVersion": "2.4.1",
  "meterType": "Carlo Gavazzi EM340"
}]

Response

Field	Type	Required	Description
`status`	RegistrationStatus	Required	Whether the charge point is accepted onto the network.
`currentTime`	dateTime	Required	The CSMS's current time. Chargers commonly use this to set their clock.
`interval`	integer	Required	Heartbeat interval in seconds when Accepted; retry interval when Pending or Rejected.

json

[3, "19223201", {
  "status": "Accepted",
  "currentTime": "2026-09-09T10:15:30.000Z",
  "interval": 300
}]

Values

RegistrationStatus

Value	Meaning
`Accepted`	The charge point is registered and may send other messages.
`Pending`	The CSMS knows the charger but is not ready. The charger waits and retries; the CSMS may send configuration messages in the meantime.
`Rejected`	The charge point is not accepted. It must wait `interval` seconds before retrying.

Implementation notes

`interval` means different things per status. On Accepted it is the heartbeat interval. On Pending and Rejected it is the minimum wait before the charger sends BootNotification again. Chargers that treat it as a heartbeat interval in all three cases produce reconnect storms against a CSMS that is rejecting them.

`chargePointVendor` and `chargePointModel` are required and frequently empty in early firmware. A CSMS should reject a boot with either missing rather than provisioning a nameless station.

A charge point must send BootNotification again after any reset, and after firmware update.