Using dupterm I am able to redirect stdout on the USB port of the pyboard to another UART (aka serial TTL port). I've tested it using the REPL and it works just fine. However, many of my target pyboards don't have an extra UART available for such use, so I tried making a small external adapter board using the FT230X "USB to basic UART" chip (from FTDI), in self-powered mode.
Unfortunately I can't get it to work. So I'm wondering if anyone has been able to do this, either with this chip or some other external way that doesn't require using another UART on the pyboard. Thanks