buttond

#!/bin/bash
# Check button state and light up led when pressed

set -eu

BUTTON_PIN=${BUTTON_PIN:-0}
LIGHT_PIN=${LIGHT_PIN:-1}
MQTT_PASS=${MQTT_PASS:-changeservice}

# Configure pins
raspi-gpio set $BUTTON_PIN ip
raspi-gpio set $LIGHT_PIN op

# Force initial update
last_state=-1

mqtt_notify() {
  # Allow for e.g. MQTT network errors to occur without exiting the program
  set +e
  echo -n 'mqtt: '
  mosquitto_pub --capath /etc/ssl/certs/ -h mq.hackeriet.no -p 8883 -t 'hackeriet/space_state' -d -u humladoor -P $MQTT_PASS -r -m $1
  set -e
}

while true; do
  # awk snipped from https://ma2shita.medium.com/how-to-use-raspi-gpio-instead-of-gpio-of-wriring-pi-af2ab00eda57
  btn_state=$(raspi-gpio get $BUTTON_PIN | awk -v RS=" " -F "=" -v k="level" '$1==k {print $2}')

  # Only write to pin when needed
  if [ x$btn_state != x$last_state ]; then
    echo "Button state set to $btn_state"
    last_state=$btn_state

    if [ "$btn_state" -eq "1" ]; then
      raspi-gpio set $LIGHT_PIN dh
      mqtt_notify OPEN
    else
      raspi-gpio set $LIGHT_PIN dl
      mqtt_notify CLOSED
    fi
  fi

  sleep 0.1
done