@echo off
SET portname=COM12
:loop
set /p x="~U" <nul >\\.\%portname%
ping -n 2 127.0.0.1 > nul
goto loop

#!/bin/bash
PORT=/dev/ttyACM0
while true
do
 echo -n "~U" > $PORT
 sleep 1
done

@echo off
SET hostname=google.com
SET portname=COM12
:loop
  ping -n 1 -l 4 -w 1000 %hostname% >nul
  if %errorlevel%==0 set /p x="~U" <nul >\\.\%portname%
  ping -n 2 127.0.0.1 > nul
goto loop

#!/usr/bin/env bash
HOST="google.com"
PORT=/dev/ttyACM0
while true
do
    if ping -c 1 $HOST; then
    echo -n "~U" > $PORT
    fi
sleep 3
done

#!/usr/bin/env bash

PORT=/dev/ttyACM0
PROCESS=crond

if [ ! -z "$1" ];then
	PROCESS="$1"
	echo "Monitor $PROCESS"
fi

while true; do
	if pgrep "$PROCESS" > /dev/null; then
		echo -n "~U" > $PORT
	fi
	sleep 3
done

#!/usr/bin/env bash

PORT=/dev/ttyACM0
URL=google.com
PROCESS=crond

while getopts ":ha:p:" opt; do
	case ${opt} in
		a)
			URL=$OPTARG
			;;
		p)
			PROCESS=$OPTARG
			;;
		h)
			echo "Usage: $0 -a <url> -p <process>" 1>&2
			exit 1
			;;
		\?)
			echo "Invalid option: -$OPTARG" 1>&2
			exit 1
			;;
	esac
done

echo "Ping $URL"
echo "Monitor $PROCESS"

while true; do
	ping -n -c 1 -w 1 "$URL" 2>/dev/null 1>&2 && pgrep "$PROCESS" 2>/dev/null 1>&2 && echo -n "~U" > $PORT
	sleep 3
done

from time import sleep
import serial

port = '/dev/cu.usbmodem1411'
ser = serial.Serial(port)
while True:
    ser.write(b'~G')
    ser_data = ser.readline()
    if ser_data:
        data = ser_data.decode("utf-8")
        print('Read from serial (repl to ~G): {0}'.format(data))
        if data.startswith('~G'):
            print('Temperature is {0}'.format(int(data[2:])/10))
    else:
        print('sensor error')
    sleep(1)