Universal Modbus-MQTT Data Diode

I need a manufacturer-independent, single-unit Data Diode that guarantees one-way traffic from my operational equipment into the corporate IT network. On the OT side I have industrial controllers and sensors communicating over Modbus TCP; once the data reaches IT it must be forwarded seamlessly into an MQTT/MQTTS broker so other applications can subscribe. Key expectations • Hardware or virtual appliance that physically enforces unidirectional flow (OT ➔ IT) with no return channel. • Native parsing of Modbus TCP on the inbound side and automatic repackaging or bridging to MQTT/MQTTS on the outbound side. TLS support is required for secure MQTT connections. • Configuration interface that lets me map Modbus registers to MQTT topics without vendor lock-in. • Throughput suitable for typical controller polling rates (please indicate benchmarked values). • Clear documentation covering installation, network segregation, and recovery procedures, plus sample configs for common brokers such as Mosquitto and HiveMQ. Acceptance will be based on a lab demo: I will feed live Modbus traffic from a PLC, observe that frames cross the diode only in the permitted direction, and verify that the same values appear as MQTT messages on the IT broker with no packet leakage the other way.