Creating a wifi subnet for the dash buttons

It could be useful to have the dash buttons working with the raspberry pi in a place where there is no wifi or internet coverage. The raspberry pi can be setup as a wifi hotspot and the dash buttons configured to join this network. Taking things a bit further, the raspberry pi could be set up to route requests received via the wifi subnet through the cabled network, to the internet router/home network and to the internet.

Yesterday I managed to do this successfully, following this tutorial. Fun times 🙂

The important files for this are:

/etc/network/interfaces
/etc/dhcpcd.conf
/etc/hostapd/hostapd.conf
/etc/default/hostapd
/etc/dnsmasq.conf

recipe of steps I followed

  1. sudo apt-get update
  2. sudo apt-get install hostapd isc-dhcp-server
  3. sudo apt-get install iptables-persistent
  4. sudo vi /etc/dhcp/dhcpd.conf
    1. comment the lines
      1. #option domain-name “example.org”;
        #option domain-name-servers ns1.example.org, ns2.example.org;
    2. uncomment the line
      1. authoritative;
    3. Add the following lines at the end
      1. subnet 192.168.43.0 netmask 255.255.255.0 {
        range 192.168.43.10 192.168.43.50;
        option broadcast-address 192.168.43.255;
        option routers 192.168.43.1;
        default-lease-time 600;
        max-lease-time 7200;
        option domain-name “local”;
        option domain-name-servers 8.8.8.8, 8.8.4.4;
        }
  5. sudo vi /etc/default/isc-dhcp-server
    1. add wlan0 to the INTERFACES variable
      1. INTERFACES=”wlan0″
  6. sudo ifdown wlan0
  7. sudo vi /etc/network/interfaces
    1. allow-hotplug wlan0
      iface wlan0 inet static
      address 192.168.43.1
      netmask 255.255.255.0
  8. sudo ifconfig wlan0 192.168.43.1
  9. sudo vi /etc/hostapd/hostapd.conf
    1. interface=wlan0
      driver=nl80211
      ssid=jarvis
      country_code=US
      hw_mode=g
      channel=6
      macaddr_acl=0
      auth_algs=1
      ignore_broadcast_ssid=0
      wpa=2
      wpa_passphrase=Raspberry
      wpa_key_mgmt=WPA-PSK
      wpa_pairwise=CCMP
      wpa_group_rekey=86400
      ieee80211n=1
      wme_enabled=1
  10. sudo vi /etc/default/hostapd
    1. DAEMON_CONF=”/etc/hostapd/hostapd.conf”
  11. sudo vi /etc/sysctl.conf
    1. net.ipv4.ip_forward=1
  12. sudo sh -c “echo 1 > /proc/sys/net/ipv4/ip_forward
  13. create NAT rules with iptables
    1. sudo iptables t nat A POSTROUTING o eth0 j MASQUERADE
    2. sudo iptables A FORWARD i eth0 o wlan0 m state state RELATED,ESTABLISHED j ACCEPT
    3. sudo iptables A FORWARD i wlan0 o eth0 j ACCEPT
  14. sudo sh -c “iptables-save > /etc/iptables/rules.v4”
  15. sudo service hostapd start
  16. sudo service isc-dhcp-server start
  17. sudo service hostapd status
  18. sudo service isc-dhcp-server status
  19. sudo update-rc.d hostapd enable
  20. sudo update-rc.d isc-dhcp-server enable
  21. sudo reboot
  22. tail -f /var/log/syslog
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One thought on “Creating a wifi subnet for the dash buttons

  1. Pingback: Loading arduino programs from headless raspberry pi | My Map of things

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