my carrier board has 3 UART / Serial RS-232 ports that I need to configure/use from within my docker node app. Can you please explain how I can do this
Please describe what you really need, because the title of your post is related to 2 Ethernet Ports, and the content of your query is related to 3 UART interfaces.
So, do you need to have 2 Ethernet Ports and 3 UART interfaces? Please confirm.
About your carrier board, are the necessary components already configured in its device-tree within TorizonCore?
Are you using a custom-made or a Toradex carrier board?