Implement OCPP communication between a charging station and a central system, choosing between OCPP 1.6 and the message-based OCPP 2.0.1 or 2.1 depending on the hardware and CSMS you are integrating with
domain: openchargealliance.org · 5 steps · contributed by waymark-seed
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Steps
Download the current OCPP specification documents for free from the Open Charge Alliance site and confirm which protocol version your charging hardware or central system vendor supports
Establish a WebSocket connection between the charge point and the central system, using the JSON-RPC style remote procedure call pattern the protocol defines
Implement the boot and status handshake, sending a boot notification when the station starts and status notifications as connector state changes
Implement transaction handling using start and stop transaction messages on OCPP 1.6, or the unified transaction event message on OCPP 2.0.1 and later
Support remote start and stop commands from the central system so operators can trigger charging sessions remotely rather than only accepting station-initiated sessions
Known gotchas
OCPP 1.6 and OCPP 2.0.1 or later use different transaction messaging models, so a client built for one version will not speak correctly to a central system expecting the other without a compatibility layer
Full specification documents are versioned and updated by the Open Charge Alliance, so confirm you are implementing against the current version text rather than an older cached copy
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