The UART setup is at 38400 baud …
hardware.uart12.configure(38400, 8, PARITY_NONE, 1, NO_CTSRTS);
It seems like that number can be changed because it’s in a field … to 9600? Is it possible to use a slower baud rate? I don’t see anything about using anything besides 38400.
I found the documentation … so I answered my own question:
http://electricimp.com/docs/api/hardware-uart-configure/
I’ll leave this here in case new Imp owners had the same question.