Single Ethernet for ModBus and BACbus

[JBias]

I want to use a single Ethernet port to run both a Modbus connection and a BACnet. This will be on a STM32H7 processor and using AZURE RTOS 

[Pavel A.]

Approved. Access granted :)

[JBias]

Thanks Pavel. Do you have 1st hand knowledge of such an implementation and the degree of difficulty involved? Any helpful suggestions/directions are greatly appreciated

[Pavel A.]

I have 1st hand knowledge of Modbus and some similar protocols but not specifically BACnet.

TL;DR: getting Ethernet to work reliably on STM32H7 can be notoriously hard, despite of many available examples and how-to posts. Especially with a custom PHY that does not appear on ST eval. boards.

Azure RTOS is no longer backed up by Microsoft and now it is Eclipse ThreadX and NetX. 

Unless you have experience with STM32 or other similar MCUs, networking and related software tools, find a contractor with this experience to build a prototype.