How to accept incoming MQTT connections on TCP 443 with Azure IotHub?

Question

We are building an Industrial IoT solution which for some connectivity reasons needs to communicate with the MQTT Broker using TCP 443.

We already do this with a RabbitMQ broker which works well but needs to have a consumer to push into an EventHub.

We would like to migrate onto a IoTHub Solution which is totally integrated in the Azure Environnement but are facing a problem with this incoming TCP Port.

Azure IoTHub allows incoming connections as follows:

• MQTT on Port 8883
• MQTT over WebSocket on Port 443.
• And some more connections with AMQP

Unfortunately the Industrial Device we do use is not compatible with WebSockets.

I thought about using some Firewall/Load Balancer NAT rules to redirect incoming TCP Connections on 443 to IoTHub's 8883.... Only solutions I found are only limited to redirect onto VMs, not the IoT Hub.

If someone has an idea, that would be great!