Raspberry Pi Wifi (Station + AP modes)

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    I have posted NEW Getting started instructions here:

    pifi - Raspberry Pi 3 - WiFi Station+AP

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    UPDATE 2018-03-15

    I wrote this post about a year ago, putting together some notes on how I got my Raspberry Pi 3 running in both Station (Wifi Client) and AP (Access Point) mode. However some changes have been made to Raspian and some of the steps are not exacly the same. I will leave this post for refrence, however if you are interested in a better solution then checkout my project IOT Wifi

    https://pifi.imti.co/


    THE FOLLOWING IS DEPRICATED -Refrence Only

    Running the Raspberry Pi 3 as a Wifi client (station) and access point (ap) from the single built-in wifi.

    Overview

    We will be editing the following files:

    Station Setup

    The following will configure the Pi to access a wifi network as a client (station).

    Create the wpa_supplicant configuration:

    sudo vi /etc/wpa_supplicant/wpa_supplicant.conf

    Add and customize the following:

    Network Interfaces

    Edit the interfaces configuration:

    sudo vi /etc/network/interfaces

    The entire configuration file should look like the following:

    The uap0 interface will be used later on for our Access Point (AP).

    Reboot the Pi:

    sudo reboot

    After the Pi boots up run the following command to check the status of the the wlan0 interface:

    ifconfig

    You should see wlan0 has received an ip address from the network it connected to:

    ifconfig

    Use iw to check the wireless status of wlan0.

    iw dev wlan0 link

    You see the SSId of the network you are connected to like this:

    iw dev wlan0 link

    AP Setup

    Install hostapd and dnsmasq:

    sudo apt-get install hostapd dnsmasq

    Create a new hostapd configuration:

    sudo vi /etc/hostapd/hostapd.conf

    The new configuration should look like this:

    Of course you will want to customize a few things like the ssid and passphrase (wpa_passphrase). You will also want to determine the best channel by looking at the channel wlan0 is currently using.

    iwlist wlan0 channel

    In this example output the Pi is using Channel 11:

    iwlist output

    Next you will need to modify the hostapd default configuration to use your new configuration file:

    sudo vi /etc/default/hostapd

    Add the following line:

    DAEMON_CONF="/etc/hostapd/hostapd.conf"

    Next we need to make a script to set the interface to AP mode, start hostapd and set some iptables configuration.

    sudo vi /usr/local/bin/hostapdstart

    Add the following lines to this new script.

    Update permissions on the new hostap start script.

    chmod 775 /usr/local/bin/hostapdstart

    DNS Setup

    We need the new AP to hand out IP addresses to our clients. Configure dnsmasq by editing the following.

    sudo vi /etc/dnsmasq.conf

    The configration should look like the following.

    Start dnsmasq with the following.

    sudo service dnsmasq start

    Starup

    Edit the rc.local script to run hostapdstart on boot up.

    sudo vi /etc/rc.local

    Add the following line.

    /bin/bash /usr/local/bin/hostapdstart

    Reboot the the Pi

    sudo reboot

    Raspberry Pi Wifi links I have benefitted from

    Wifi and Networking

    Check out my updated instructions to get your Raspberry Pi working in Station and AP mode at http://pifi.imti.co/ and the Github project athttps://github.com/cjimti/iotwifi


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