Arduino-cli board hard reset command

Development Tools Arduino Command Line Tools
3

Thanks In0 for your replay. I understand the difficulty to cope with a lot of different boards. Thanks also for the suggestion for a soft reset.

Anyway, I have written a small bash script performing an USB hard reset via RTS. I tested it with arduino nano and nodeMCU v3 esp8266 and it seems to work well.
Since, I think it may be useful for other developers, here it is

#!/bin/bash
# .title      : Arduino board hard reset by USB
# .author : Fabrizio Pollastri <mxgbot@gmail.com>

if [[ ! $1 =~ ^[0-9]+$ ]]
then
    echo "USAGE: ./arduino_reset.sh <TTYUSB_NUMBER_ONLY>"
    exit
fi
SERIALPORT="/dev/ttyUSB$1"
DELAY="1"
echo "
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
main() {
  int port_fd = open(\"${SERIALPORT}\",O_RDWR | O_NOCTTY);
  if (errno)
    printf(\"Error opening %s: %s (%d).\n\",\"${SERIALPORT}\",strerror(errno),errno);
  int modem_ctrl,modem_ctrl_saved;
  if (ioctl(port_fd,TIOCMGET,&modem_ctrl_saved) == -1)
    printf(\"Error getting handshake lines: %s (%d).\n\",strerror(errno),errno);
  modem_ctrl = (modem_ctrl_saved | TIOCM_RTS) & ~TIOCM_DTR;
  if (ioctl(port_fd,TIOCMSET,&modem_ctrl) == -1)
    printf(\"Error setting handshake lines: %s (%d).\n\",strerror(errno),errno);
  sleep (${DELAY});
  if (ioctl(port_fd,TIOCMSET,&modem_ctrl_saved) == -1)
    printf(\"Error setting handshake lines: %s (%d).\n\",strerror(errno),errno);
  close(port_fd);
} " | tcc -run -

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