<div id="readability-page-1" class="page"><section>
<h3 id="motivation">Motivation</h3>
<p>Recently, I watched google i/o tech talks and I found that progressive web + physical web is quite interesting. I had an idea that i want to play with Bluetooth Low Energy devices. For prototying the idea, I bought a raspberry pi zero w. (yup. this is my second one). Before watching the techtalk, rpi0 meant nothing to me. Because I always wanted to have powerful small computers that I can make a cluster. Now, it makes sense to play with rpi0w. it's a good fit for me to play with it to prototype physical web related ideas.</p>
<h3 id="prep">prep</h3>
<ul>
<li>install virtualbox and ubuntu. prepare your disk that is larger than 16GB if it's a desktop version of ubuntu.</li>
<li>docker should be up and running locally</li>
</ul>
<h3 id="tldr">tl;dr</h3>
<p>In your <code>mix.exs</code> add <code>rpi0_ble</code></p>
<pre><code> def deps("rpi0") do
    [{:nerves_runtime, "~&gt; 0.1.0"},
     {:"nerves_system_rpi0_ble", github: "jaigouk/nerves_system_rpi0_ble", tag: "v0.0.4", runtime: false},
     {:nerves_interim_wifi, "~&gt; 0.1.0"}]
  end
</code></pre>
<p>burn your sdcard with following commands.</p>
<pre><code>MIX_TARGET=rpi0 mix deps.get
MIX_TARGET=rpi0 mix firmware
#Burn to an SD card with 
MIX_TARGET=rpi0 mix firmware.burn
</code></pre>
<p>the image has <code>iptables, ssh, erlang, node.js, bluez, git, vi, etc</code>. Because it's for prototyping a ble app and testing it.</p>
<h3 id="configuretheimage">configure the image</h3>
<p>I need to customize the default rpi0 because i need to add bluez. I found <a href="https://learn.adafruit.com/install-bluez-on-the-raspberry-pi/overview">this tutorial</a> from adafruit. Since <a href="http://nerves-project.org/">nerves-project</a> is using <a href="https://buildroot.org/">buildroot</a>, there must be a way to add the libarary to my rpi0. And then I found <a href="https://delog.wordpress.com/2014/10/29/bluetooth-on-raspberry-pi-with-buildroot/">this blog post</a></p>
<p><img src="https://pbs.twimg.com/media/C8SMgSYXkAATESg.jpg" alt="bluez" loading="lazy"></p>
<p>I referenced <a href="https://speakerdeck.com/joelbyler/nerves-plus-phoenix-saves-a-fathers-sanity">this slide</a> and getting started doc from nerves-project.</p>
<p>install and download libraries we need</p>
<pre><code>sudo apt-get install git g++ libssl-dev libncurses5-dev bc m4 make unzip cmake
git clone <a href="/cdn-cgi/l/email-protection" data-cfemail="20474954604749544855420e434f4d">[email&nbsp;protected]</a>:nerves-project/nerves-system-br.git
git clone <a href="/cdn-cgi/l/email-protection" data-cfemail="3d5a54497d5a544955485f135e5250">[email&nbsp;protected]</a>:jaigouk/nerves_system_rpi0_ble.git
mkdir -p ~/.nerves/cache/buildroot
nerves_system_br/create-build.sh nerves_system_rpi0_ble/nerves_defconfig ~/.nerves/cache/buildroot
cd ~/.nerves/cache/buildroot
</code></pre>
<p>Now, let's configure our linux image.</p>
<ul>
<li>Select base packages by running <code>make menuconfig</code></li>
<li>Modify the Linux kernel and kernel modules with <code>make linux-menuconfig</code></li>
<li>Enable more command line utilities using <code>make busybox-menuconfig</code></li>
</ul>
<p><code>make menuconfig</code> will launch gui that helps you to add extra packages. I want to add <code>iptables, git</code></p>
<pre><code>│ Prompt: git
│   Location:
│     -&gt; Target packages
│       -&gt; Development tools
</code></pre>
<p>iptables</p>
<pre><code>│ Prompt: iptables
│   Location:
│     -&gt; Target packages
│       -&gt; Networking applications
</code></pre>
<p>open ssh</p>
<pre><code>│ Prompt: openssh
│   Location:
│     -&gt; Target packages
│       -&gt; Networking applications
</code></pre>
<p>openssl</p>
<pre><code> Prompt: openssl
│   Location:
│     -&gt; Target packages
│       -&gt; Libraries
│         -&gt; Crypto
</code></pre>
<p>you can even find <code>nginx, wireshark,etc</code> in networking applications.</p>
<p>Run <code>make savedefconfig</code> after <code>make menuconfig</code> to update the nerves_defconfig in your System. it will spit out results like this.</p>
<pre><code>umask 0022 &amp;&amp; make -C /home/jaigouk/nerves_system_br/buildroot-2016.11.1 O=/home/jaigouk/.nerves/cache/buildroot/. savedefconfig
  GEN     /home/jaigouk/.nerves/cache/buildroot/Makefile
</code></pre>
<p><code>linux-menuconfig</code></p>
<pre><code>│ Prompt: Bluetooth Low Energy (LE) features
│   Location:
│     -&gt; Networking support (NET [=y])
│       -&gt; Bluetooth subsystem support (BT [=y])
</code></pre>
<p>Run <code>make linux-savedefconfig</code> and <code>cp build/linux-x.y.z/defconfig &lt;your system&gt;</code></p>
<pre><code>umask 0022 &amp;&amp; make -C /home/jaigouk/nerves_system_br/buildroot-2016.11.1 O=/home/jaigouk/.nerves/cache/buildroot/. linux-savedefconfig
</code></pre>
<p>we can add <code>vim, grep, ifconfig, ping, ps, top, free, etc</code> with following command. busybox-menuconfig only works when busybox is enabled.</p>
<pre><code>make busybox-menuconfig
</code></pre>
<p>this is what getstarted doc says.</p>
<blockquote>
<p>If your system doesn’t contain a custom Linux configuration yet, you’ll need to update the Buildroot configuration to point to the new Linux defconfig in your system directory. The path is usually something like <code>$( )/linux-x.y_defconfig</code>.<br>
For Busybox, the convention is to copy <code>build/busybox-x.y.z/.config</code> to a file in the System repository. Like the Linux configuration, the Buildroot configuration will need to be updated to point to the custom config.</p>
</blockquote>
<pre><code>/home/jaigouk/.nerves/cache/buildroot/build/busybox-1.25.1/.config
</code></pre>
<p>So I copied <code>defconfig</code> to <code>nerves_system_rpi0_ble/linux-4.4.defconfig</code> and <code>.config</code> to <code>nerves_system_rpi0_ble/nerves_defconfig</code></p>
<p>now my custom rpi0 config is ready to be used.</p>

</section></div>

Jaigouk.Kim

Motivation
Recently, I watched google i/o tech talks and I found that progressive web + physical web is quite interesting. I had an idea that i want to play with Bluetooth Low Energy devices. For prototying the idea, I bought a raspberry pi zero w. (yup. this is my second one). Before watching the techtalk, rpi0 meant nothing to me. Because I always wanted to have  powerful small computers that I can make a cluster. Now, it makes sense to play with rpi0w. it's a good fit for me to play with it to prototype physical web related ideas.
prep
install virtualbox and ubuntu. prepare your disk that is larger than 16GB if it's a desktop version of ubuntu.
docker should be up and running locally
tl;dr
In your mix.exs add rpi0_ble
 def deps("rpi0") do
    [{:nerves_runtime, "~> 0.1.0"},
     {:"nerves_system_rpi0_ble", github: "jaigouk/nerves_system_rpi0_ble", tag: "v0.0.4", runtime: false},
     {:nerves_interim_wifi, "~> 0.1.0"}]
  end
burn your sdcard with following commands.
MIX_TARGET=rpi0 mix deps.get
MIX_TARGET=rpi0 mix firmware
#Burn to an SD card with 
MIX_TARGET=rpi0 mix firmware.burn
the image has iptables, ssh, erlang, node.js, bluez, git, vi, etc. Because it's for prototyping a ble app and testing it.
configure the image
I need to customize the default rpi0 because i need to add bluez. I found this tutorial from adafruit. Since nerves-project is using buildroot, there must be a way to add the libarary to my rpi0. And then I found this blog post
I referenced this slide and getting started doc from nerves-project.
install and download libraries we need
sudo apt-get install git g++ libssl-dev libncurses5-dev bc m4 make unzip cmake
git clone git@github.com:nerves-project/nerves-system-br.git
git clone git@github.com:jaigouk/nerves_system_rpi0_ble.git
mkdir -p ~/.nerves/cache/buildroot
nerves_system_br/create-build.sh nerves_system_rpi0_ble/nerves_defconfig ~/.nerves/cache/buildroot
cd ~/.nerves/cache/buildroot
Now, let's configure our linux image.
Select base packages by running make menuconfig
Modify the Linux kernel and kernel modules with make linux-menuconfig
Enable more command line utilities using make busybox-menuconfig
make menuconfig will launch gui that helps you to add extra packages. I want to add iptables, git
│ Prompt: git
│   Location:
│     -> Target packages
│       -> Development tools
iptables
│ Prompt: iptables
│   Location:
│     -> Target packages
│       -> Networking applications
open ssh
│ Prompt: openssh
│   Location:
│     -> Target packages
│       -> Networking applications
openssl
 Prompt: openssl
│   Location:
│     -> Target packages
│       -> Libraries
│         -> Crypto
you can even find nginx, wireshark,etc in networking applications.
Run make savedefconfig after make menuconfig to update the nerves_defconfig in your System. it will spit out results like this.
umask 0022 && make -C /home/jaigouk/nerves_system_br/buildroot-2016.11.1 O=/home/jaigouk/.nerves/cache/buildroot/. savedefconfig
  GEN     /home/jaigouk/.nerves/cache/buildroot/Makefile
linux-menuconfig
│ Prompt: Bluetooth Low Energy (LE) features
│   Location:
│     -> Networking support (NET [=y])
│       -> Bluetooth subsystem support (BT [=y])
Run make linux-savedefconfig and cp build/linux-x.y.z/defconfig <your system>
umask 0022 && make -C /home/jaigouk/nerves_system_br/buildroot-2016.11.1 O=/home/jaigouk/.nerves/cache/buildroot/. linux-savedefconfig
we can add vim, grep, ifconfig, ping, ps, top, free, etc with following command. busybox-menuconfig only works when busybox is enabled.
make busybox-menuconfig
this is what getstarted doc says.
If your system doesn’t contain a custom Linux configuration yet, you’ll need to update the Buildroot configuration to point to the new Linux defconfig in your system directory. The path is usually something like $( )/linux-x.y_defconfig.
build/busybox-x.y.z/.config to a file in the System repository. Like the Linux configuration, the Buildroot configuration will need to be updated to point to the custom config.
/home/jaigouk/.nerves/cache/buildroot/build/busybox-1.25.1/.config
So I copied defconfig to nerves_system_rpi0_ble/linux-4.4.defconfig and .config to nerves_system_rpi0_ble/nerves_defconfig
now my custom rpi0 config is ready to be used.

raspberry pi zero w for IOT dev env

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