Bash serial (tty) looper

serialloop.sh

#!/bin/bash

DEVICE=/dev/ttyUSB0
BAUDRATE=230400

echo "=======SETTINGS========="
echo "port: $DEVICE"
echo "spped: $BAUDRATE"
echo "========================"

sudo stty -F  $DEVICE $BAUDRATE parity=none bits=8

echo "=====VALIDATING========"
stty -F $DEVICE

echo "==Stargin loop=="

COUNTER=20
until [  $COUNTER -lt 10 ]; do
	echo "Loop !!!"
	echo -e 'A' > stty -F  $DEVICE $BAUDRATE parity=none bits=8
	sleep 1
done