#!/bin/bash

TTY_DEVICE="/dev/ttyACM0"
# 参数为 "poweroff", "halt", "reboot"等
ACTION=$1

# 当关机(poweroff)或重启(reboot)时才发送
if [ "$ACTION" = "poweroff" ] ; then
    if [ -w "$TTY_DEVICE" ]; then
        stty -F "$TTY_DEVICE" 115200 cs8 -cstopb -parenb
        printf "ok\r\n" > "$TTY_DEVICE"
    fi
fi
exit 0