In order to connect to the WiFi network a proper configuration needs to be provided. This tutorial shows how to do this using the wpa_supplicant tool and the systemd service manager.

First, create the /etc/wpa_supplicant directory and the /etc/wpa_supplicant/wpa_supplicant-wlan0.conf file with the following configuration:

• sudo nano /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1

network={
  ssid="<NETWORK_SSID>"
  psk="<NETWORK_PASSWORD>"
  key_mgmt=WPA-PSK
  proto=WPA2
  pairwise=CCMP TKIP
  group=CCMP TKIP
  scan_ssid=1
}

The network in the example is protected with the WPA2 standard and requires a password. The <NETWORK_SSID> and <NETWORK_PASSWORD> fields need to be changed according to the existing network configuration.

Create the /etc/systemd/network/25-wlan.network file:

• sudo nano /etc/systemd/network/25-wlan.network

[Match]
Name=wlan0

[Network]
DHCP=ipv4

Enable the wpa_service for the wlan0 interface:

• sudo systemctl enable wpa_supplicant@wlan0.service

Restart the systemd-networkd and wpa_supplicant services:

• sudo systemctl restart systemd-networkd.service && sudo systemctl restart wpa_supplicant@wlan0.service

and check the interface status:

• ip a

The wireless network (wlan0) should now be enabled and configured after each system boot.

• sudo apt-get -y install python-rpi.gpio
• sudo systemctl enable pigpiod
• sudo nano /etc/init.d/pigpiod

#!/bin/bash
### BEGIN INIT INFO
# Provides:          pigpiod
# Required-Start:    $syslog
# Required-Stop:     $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start GPIO
# Description:       Enable GPIO library for rapberry pi
### END INIT INFO

/usr/bin/pigpiod
exit 0

• sudo nano /etc/init.d/control

#!/bin/bash
### BEGIN INIT INFO
# Provides:          control
# Required-Start:    pigpiod
# Required-Stop:     pigpiod
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start temprature monitoring at boot time
# Description:       Enable environment logging
### END INIT INFO

case "$1" in
  start)
    echo "Starting script /usr/bin/control.py"
    python /usr/bin/control.py > /dev/null &
    ;;
  stop)
    echo "Stopping script /usr/bin/control.py || pkill python"
    pkill python &
    ;;
  *)
    echo "Usage: /etc/init.d/control {start|stop}"
    exit 1
    ;;
esac

exit 0

• sudo chmod +x /etc/init.d/control
• sudo systemctl enable control

• ssh-keygen Add key to github account with repo, admin:public_key admin:something packages:delete permissions

• sudo ln -s /usr/bin/control.py $PWD/control.py
• sudo chmod +x /usr/bin/control.py

  Read first lines of control.py to setup the database etc