How Does OCPP Work in EV Charging Stations?
A practical explanation of OCPP messages, charger connectivity and the role of a central system.
Published October 30, 2026An open communication protocol
OCPP lets a charge point exchange standardized messages with a central system over a network connection. A charger can announce that it is online, report connector status, request authorization, send meter readings and report transaction events.
From message to workflow
The CSMS validates and stores these events, then makes them useful through dashboards, session records, remote actions and reports. A remote command is sent back through OCPP, but the supported result still depends on charger firmware and its implemented feature profile.
Why testing matters
Two chargers can advertise the same OCPP version yet behave differently at edge cases. Model, firmware, security settings, reconnect behavior and required messages should be tested before a commercial rollout.