Serial port hangs with cut and paste at low clock rates

[terrillmoore]

When provisioning, one often has to cut/paste.

Unfortunately, this causes the serial port RX path to hang due to buffer overrun. It's ok if things don't work but it's very confusing to have things hang.

I find that, at 2 MHz clock, if I set the inter-char delay to 10ms in Teraterm, all is well, and it's still quite usable.

But having things just hang (rather than getting an error message) is really unfortunate.

It's possible that this is a BSP problem rather than a Catena-Arduino-Platform problem.

To reproduce, try to provision a device, and cut/paste the appeui from the console. lorawan configure appeui XXXXXXXXXXXXXXXX<enter> will cause the rx path to stop responding. If you're in mfg test mode, that loop keeps running and outputting data.