Change to unique_board_id example

[giripriyadarshan]

added loop to print board_id every 2 seconds and in order to print it to something, added uart and USB output to CMakeLists.txt

[kilograham]

can you please rebase

[lurch]

You still need to rebase this onto the latest version of develop.

[giripriyadarshan]

did it work? ... i'm sorry, i'm a git noob

[lurch]

Yep, "Files changed" tab at the top shows only 2 files 🙂

[giripriyadarshan]

Thank you

[peterharperuk]

I don't think we want to merge this. There's a setting that will wait for USB to appear before continuing. I propose setting this for the examples #496
Whether we should be using stdiouart or stiousb or both is a good question. I think we'll address this for all the examples #321