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<code bash>
#!/usr/bin/env bash
 
LOG_FILE=/var/log/camswitch.log
AWAY_THRESHOLD=3
CHECK_INTERVAL=50
CHECK_DURATION=7
CAMERA_IP=192.168.100.7
PROGRAM_NAME=$(basename $0)

function log {
  time=$(date "+%Y-%m-%d %H:%M:%S")
  echo "[$time] $1" | tee -a $LOG_FILE
}

function check_presence {
  chipolo_id=C18002ABD9578
  check_result=$(timeout --preserve-status --signal=SIGINT --foreground ${CHECK_DURATION}s  hcitool lescan)
  if [ $? -ne 0 ]; then
    log "hcitool lescan failed, restarting hciuart.service"
    systemctl restart hciuart.service
    sleep $CHECK_INTERVAL
    continue
  fi
  if [ $(echo "$check_result" | grep -c $chipolo_id) -gt 0 ]; then 
     presence_status=present
  else
     presence_status=away
  fi

  log "chipolo ($chipolo_id) $presence_status"
  #log "away count: $away_count"
  #log "last status: $last_presence_status"
}

function switch_camera_off {
  log "switching camera off"
  echo -en '\xAF\xFF\x02\x02\xDF' > /dev/ttyUSB0  
  sleep 3
  echo -en '\xAF\xFF\x02\x02\xDF' > /dev/ttyUSB0  
}

function switch_camera_on {
  log "switching camera on"
  echo -en '\xAF\xFF\x01\x01\xDF' > /dev/ttyUSB0  
  sleep 3
  echo -en '\xAF\xFF\x01\x01\xDF' > /dev/ttyUSB0  
}

function check_camera {
  ping -c3 -q $CAMERA_IP
  if [ $? -eq 0 ]; then
    camera_status="pingable"
  else
    camera_status="not pingable"
  fi
  log "camera $camera_status"
}

away_count=0
last_presence_status=present


#########################

log "$PROGRAM_NAME started"

trap 'log "$PROGRAM_NAME stopped"; exit' SIGINT SIGTERM SIGHUP 
while true; do

  check_presence
  
  if [ "$presence_status" = "away" ] ; then
    if [ $away_count -ne $AWAY_THRESHOLD ]; then
      away_count=$((away_count+1))
    else
      check_camera
      if [ "$camera_status" = "not pingable" ]; then
        switch_camera_on
      fi
    fi
  fi

  if [ "$presence_status" = "present" ]; then
      #if [ $away_count -ge $AWAY_THRESHOLD ]; then
	check_camera
	if [ "$camera_status" = "pingable" ]; then
          switch_camera_off
          sleep 3
          check_camera
        fi
        if [ "$last_presence_status" = "away" ]; then
          away_count=0
        fi
     #fi
  fi

  sleep $CHECK_INTERVAL
  last_presence_status=$presence_status
done
</code>