OCPP 1.6J vs OCPP 2.0.1: A Practical Buyer's Comparison
Buyers evaluating OCPP hardware face one recurring question: 1.6J or 2.0.1? Here is the honest engineering answer used across the industry.
Protocol Architecture
OCPP 1.6J uses JSON messages over a single WebSocket connection. It is mature, extremely widely supported, and every serious CSMS speaks it. OCPP 2.0.1 re-architects the protocol around a rich device model (variables, components), adds security enhancements (security profiles, certificates) and improved transaction handling, plus native support for Plug & Charge concepts via ISO 15118.
Feature Comparison
| Aspect | OCPP 1.6J | OCPP 2.0.1 |
|---|---|---|
| Transport | JSON over WebSocket | JSON over WebSocket (enhanced) |
| Device model | Flat key-value configuration | Structured components/variables |
| Security | Basic (password + TLS optional) | Built-in security profiles, certificate management |
| Transactions | Start/StopTransaction | Enhanced transaction lifecycle, offline tx history |
| Plug & Charge | Not supported | Designed-in (with ISO 15118) |
| CSMS support | Near-universal | Growing |
What Buyers Should Do in 2026
- Buy 1.6J hardware today. It connects to virtually every CSMS and covers sessions, metering, smart charging and OTA firmware.
- Insist on 2.0.1 compatibility. Devices whose firmware lineage targets 2.0.1 (like Wanlin's OCPP stack) upgrade more smoothly when your platform moves.
- Map your must-have profiles. For two-wheeler charging: Core, Firmware Management, Local Authorization List, Reservation, Smart Charging (TxProfile), Remote Trigger — all fully or substantially supported by Wanlin smart sockets on 1.6J.
Conclusion: OCPP 1.6J remains the interoperability workhorse; 2.0.1 is the future-proofing path. The pragmatic choice is hardware that is fully 1.6J-compliant today and 2.0.1-compatible in its firmware roadmap — exactly what the WANLIN-002 and WANLIN-010 deliver.
