Infinite while loop only runs once

[chrisknightley]

@sterretje

I was aware that some boards referred to it as RTS, but thought it was actually meant to be DTR

Yes, it may be.
Well, there are not cause other problems, so it may be better to add both.

BTW, In the olden days...
The first official produced boards used RTS for auto reset.

Avrdude RTS as Reset

I believe you are already free to use either DTR or RTS, as you like. Did you try it? retrolefty: On the first board that arduino developed that used an auto-reset feature the IDE used the RTS control signal to trigger the reset to the board. On later boards they changed to using the DTR signal to use that (I recall no reason given for the change) for the trigger signal. So to keep compatibility they had to issue both RTS and DTR pulses. There should be no issue in the future but who knows wh…