I have a strange problem. I am running Ubuntu and NodeMCU si plugged into USB. I have very simple sketch running on it, when it reads letter "R" on serial, it turns ON relay.
When I open Serial Monitor in Arduino IDE and I type letter "R" and send it, it works perfectly. However when I run commands below, it does nothing:
stty -F /dev/ttyUSB0 115200
echo "R" > /dev/ttyUSB0
I tried running the same commands on different PC with Ubuntu and these system commands work just fine.
I also tried copying exact same configuration from
stty -a -F /dev/ttyUSB from PC where it works to PC where it doesn't, but it didn't help either.
I don't think it's driver issue, because if it would, then I suppose it wouldn't work with Serial Monitor also.
Thank you for any help or hints in advance.