Hi @toby
I don’t think we have anything available that can do this. All of the dependent devices work the team has done to date, as far as I am aware, has been with microcontrollers rather than, as you say, ARM based systems.
There’s a thread here with some more information: Dependent Device support (Beta)
I don’t know enough about your use case to know if it’s a viable suggestion, but have you considered any of the TCP/IP over RS485 solutions?