Yes, need to be separated: different subnet, with isolation
It is in industrial context, so switches are much more expansive.

Correct, It is more like reading from one device to another.
But two separate Ethernet ports are needed in order to separate interfaces from each other

My use case: the ESP32 running as a protocol converter between two bus protocols that runs over the Ethernet.
For example: Bacnet (or ModBus) over Ethernet <=== ESP32 with two Ethernet ports ===> MQTT over Ethernet

Do you think it can be implemented with the bridge example from iron?

Thank you TD-er for the information.
Any chance to get it as LORA gateway soon?

Thank you TD-er for the information. Waiting for the update soon
@iron: as separated interfaces.

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