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Difference between OCPP SOAP and JSON protocol?

For JSON (supported by INCH) you need to establish connection only in direction from charger to the Ocean (backend). When communication is established, then it will work in both directions.

For SOAP, you need to establish communication in both directions separately. Make sure you enter correct backend URL and charge point identity. Charging station vendor will give you information which ports needs to be redirected for remote access, accepting commands from backend, ...

There are no NAT settings required if you are connecting INCH to Ocean by using Protocol type: OCPP 1.6 JSON.