--- title: "GridOS blog" description: "Technical and commercial guides on OCPP, OCPI, roaming, migration, and platform evaluation." canonical: "https://gridos.co/blog" --- # GridOS blog > Technical and commercial guides on OCPP, OCPI, roaming, migration, and platform evaluation. - [What Is an OCPI Gateway? Roaming Infrastructure Explained](https://gridos.co/blog/what-is-an-ocpi-gateway.md): An OCPI gateway is the operator control plane for roaming: credentials, tokens, sessions, tariffs, and CDRs. How it differs from an OCPP gateway and when CPOs need both. - [What Is an OCPP Proxy? Multi-Backend Routing Explained](https://gridos.co/blog/what-is-an-ocpp-proxy.md): An OCPP proxy sits between chargers and CPMS backends to route, dual-run, and migrate OCPP traffic safely—without reflashing hardware. How it differs from a TCP mirror and a full CPMS. - [Best OCPP Platforms for CPOs: Gateway, Proxy & Suite](https://gridos.co/blog/best-ocpp-platforms-for-cpos.md): Compare OCPP platforms for CPOs across full suite, white-label, and OCPP gateway/proxy infrastructure layers—avoid migration pain and data lock-in. - [EV Charging Software Pilot Plan for CPOs](https://gridos.co/blog/ev-charging-software-pilot-plan-for-cpos.md): EV charging software pilot plan for CPOs: test 2-3 charger models against four exit criteria, then gate procurement on evidence and avoid a costly rollout. - [EV Charging Software Pricing Guide for CPOs](https://gridos.co/blog/ev-charging-software-pricing-guide.md): EV charging software pricing guide for CPOs: compare per-charger rates plus 4 hidden cost drivers, so you buy on true cost of ownership, not the lowest quote. - [EV Charging Software RFP Checklist for CPOs](https://gridos.co/blog/ev-charging-software-rfp-checklist-for-cpos.md): EV charging software RFP checklist for CPOs: weight the 6 areas that decide whether a platform survives a real fleet rollout, not just a polished demo. - [How to Evaluate an OCPP Platform (Gateway, Proxy, or CPMS)](https://gridos.co/blog/how-to-evaluate-an-ocpp-platform.md): OCPP platform buyer guide for CPOs: score gateway vs proxy vs full CPMS on protocol depth, multi-backend routing, data ownership, and migration—not feature theater. - [Legacy CSMS Migration Plan for CPOs](https://gridos.co/blog/legacy-csms-migration-plan-for-cpos.md): A four-phase legacy CSMS migration plan for CPOs: replace the backend without recabling chargers, with a per-wave rollback path so no cutover takes you down. - [OCPI 2.1.1 vs 2.2.1: Which Version Should You Implement?](https://gridos.co/blog/ocpi-211-vs-221.md): OCPI 2.1.1 vs 2.2.1 for EV roaming: 6 key differences across hub messaging, charging profiles, and partner compatibility to help CPOs ship the right version. - [OCPP Gateway vs Full CPMS Replacement: How CPOs Decide](https://gridos.co/blog/ocpp-gateway-vs-full-cpms-replacement.md): OCPP gateway (and OCPP proxy) vs full CPMS: 5 questions show when multi-backend routing beats a big-bang platform swap for OCPP 1.6 / 2.0.1 fleets. - [When to Add an OCPP Gateway (or Proxy) Before a CPMS Swap](https://gridos.co/blog/when-to-add-an-ocpp-gateway-before-replacing-your-cpms.md): Four scenarios where an OCPP gateway or OCPP proxy cuts migration risk—phased CSMS cutover, mixed fleets, multi-backend routing—without dropping live sessions. - [Plug & Charge (ISO 15118): How It Works](https://gridos.co/blog/plug-and-charge-iso-15118-explained.md): Plug & Charge (ISO 15118) explained: how the certificate chain and an 8-step handshake let EVs authenticate without RFID, so drivers just plug in and charge. - [OCPP Charging Profiles Explained: Max, Default, Tx, and External Constraints](https://gridos.co/blog/ocpp-charging-profiles-0-1-2-3.md): OCPP charging profile purposes explained: ChargePointMaxProfile / ChargingStationMaxProfile, TxDefaultProfile, TxProfile, and ChargingStationExternalConstraints — plus stack levels and schedules. - [OCPP 1.6 to 2.0.1 Migration Guide for CPOs](https://gridos.co/blog/ocpp-16-vs-201-migration-guide.md): OCPP 1.6 to 2.0.1 migration guide for CPOs: compare 3 rollout strategies and 5 phase gates with rollback rules that keep a mixed fleet running during cutover. - [OCPI vs OCPP: What's the Difference and When to Use Each](https://gridos.co/blog/ocpi-vs-ocpp-differences.md): OCPI vs OCPP explained: OCPP connects chargers to a backend, OCPI links platforms for roaming. Use the 6-row decision matrix to scope the right protocol fast. - [Introducing GridOS: OCPP Gateway, Proxy & OCPI Gateway](https://gridos.co/blog/introducing-ev-cloud-ocpp-bridge.md): GridOS is the OCPP gateway and OCPP proxy between chargers and CPMS backends—plus OCPI gateway roaming—so you migrate, multi-home, and own data without lock-in. - [OCPP 2.0.1 Device Model: Components & Variables](https://gridos.co/blog/ocpp-201-device-model-explained.md): OCPP 2.0.1 device model explained: the component-variable tree replacing 1.6 flat keys, with 4 attribute types and a 6-point checklist to keep fleets stable. - [OCPI Roaming & OCPI Gateway: Complete Guide](https://gridos.co/blog/ocpi-roaming-complete-guide.md): OCPI roaming guide for CPOs and eMSPs—and when you need an OCPI gateway: modules, credentials, hub vs bilateral, CDR reconciliation without leaking revenue. - [OCPP 2.0.1: What Actually Changed and Why It Matters](https://gridos.co/blog/ocpp-2-0-1-deep-dive.md): OCPP 2.0.1 deep dive: the 3-layer device model, TransactionEvent stream, Plug & Charge, and a 4-step 1.6 migration plan to roll out without breaking your fleet. - [OCPP Smart Charging: Profiles & Load Management](https://gridos.co/blog/ocpp-smart-charging-profiles.md): OCPP smart charging profiles explained: the 3 profile types, stack levels, and load management, plus 6 acceptance tests to validate real power before launch. - [OCPP Security Profiles 1, 2, 3 Explained for CPOs](https://gridos.co/blog/ocpp-security-profiles-explained.md): OCPP security profiles 1–3: unsecured basic auth, TLS + basic auth, and mutual TLS. Plus how signed firmware fits outside the profile enum. - [Multi-CPMS Orchestration with an OCPP Proxy](https://gridos.co/blog/multi-cpms-orchestration.md): How an OCPP proxy routes one charger fleet to 2+ CPMS backends at the application layer—migrate and fail over without truck rolls or broken WebSocket mirrors. - [OCPI CDR Billing: How EV Roaming Payments Work](https://gridos.co/blog/ocpi-cdr-billing-integration.md): OCPI CDR billing explained: how Charge Detail Records flow between CPOs and eMSPs, with 5 acceptance tests so settlement clears without cent-level disputes. - [EV Charging Data Ownership: A CPO Guide](https://gridos.co/blog/ev-charging-data-ownership.md): EV charging data ownership for CPOs: the 4 properties that beat CPMS lock-in, plus a 3-step migration plan to cut switching costs and keep vendor leverage.