From 09be8a0d1b07dc55a55fea52365c774398658d7d Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Thu, 26 Apr 2018 19:02:41 +0200
Subject: wip

---
 slides/Makefile                |   3 +-
 slides/toc.md                  |  25 +++--
 slides/what-is-iot-reveal.html | 213 ++++++++++++++++++++++++++++++++++++-----
 slides/what-is-iot-slides.pdf  | Bin 181891 -> 314263 bytes
 slides/what-is-iot-slides.tex  | 157 +++++++++++++++++++++++++-----
 slides/what-is-iot-text.pdf    | Bin 689296 -> 331141 bytes
 slides/what-is-iot.md          | 100 ++++++++++++++++---
 7 files changed, 431 insertions(+), 67 deletions(-)

(limited to 'slides')

diff --git a/slides/Makefile b/slides/Makefile
index 846caa0..d6a5a26 100644
--- a/slides/Makefile
+++ b/slides/Makefile
@@ -7,7 +7,8 @@ HTMLS=$(P)-reveal.html
 ifeq (1,$(QUICK))
 PP_DEFS+=QUICK
 PDF_ENGINE   = pdflatex
-PANDOC_ARGS += --no-highlight
+#PANDOC_ARGS += --no-highlight
+PANDOC_ARGS += --highlight-style=pygments
 else
 PDF_ENGINE   = xelatex
 PANDOC_ARGS += --highlight-style=pygments
diff --git a/slides/toc.md b/slides/toc.md
index e01e58b..8c07c8b 100644
--- a/slides/toc.md
+++ b/slides/toc.md
@@ -3,10 +3,13 @@
     * IoT is just a concept
     * What is an IoT Device?
     * What is an IoT Device?
-    * Typical IoT chips - Bluetooth 4/5
-    * Typical IoT chips - Wi-Fi
+    * IoT Devices - Bluetooth 4/5 chips
+    * IoT Devices - LoRA
+### Modules
+### Chips
+    * IoT Devices - NB-IoT
+    * IoT Devices - Wi-Fi
     * ESP8266 details - Power usage
-    * ESP8266 details - Arduino
 * Going back to basics
     * What is the internet again?
     * OSI model
@@ -20,8 +23,16 @@
     * Details: IP
     * Details: IP
 * Lecture: ESP8266
+    * NodeMCU hardware
     * NodeMCU hardware
     * ESP8266 software layers
+    * ESP8266 + Arduino
+    * Arduino IDE
+    * Arduino code structure
+    * Arduino file structure
+    * Generic Arduino APIs
+    * ESP Arduino APIs
+    * ESP Arduino APIs
 * Lecture: MQTT
     * MQTT
     * MQTT - The protocol
@@ -34,8 +45,6 @@
     * MQTT - Patterns
     * MQTT - Implementations
     * MQTT Cloud Connectors
-* Assignments
-    * Assignment 1: Blink a led
-    * Assignment 2: Connect to Wi-Fi
-    * Assignment 3: Connect to MQTT broker
-    * Assignment 4: Network play time
+    * MQTT on Arduino
+    * MQTT on Arduino
+    * Assignment: Network play time
diff --git a/slides/what-is-iot-reveal.html b/slides/what-is-iot-reveal.html
index a2f7d9e..0d73619 100644
--- a/slides/what-is-iot-reveal.html
+++ b/slides/what-is-iot-reveal.html
@@ -15,6 +15,71 @@
       span.underline{text-decoration: underline;}
       div.column{display: inline-block; vertical-align: top; width: 50%;}
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+  <style type="text/css">
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+code.sourceCode { white-space: pre; position: relative; }
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+}
+@media print {
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+a.sourceLine { text-indent: -1em; padding-left: 1em; }
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+  { position: relative; }
+pre.numberSource a.sourceLine:empty
+  { position: absolute; }
+pre.numberSource a.sourceLine::before
+  { content: attr(data-line-number);
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+pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa;  padding-left: 4px; }
+div.sourceCode
+  {  }
+@media screen {
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+code span.al { color: #ff0000; font-weight: bold; } /* Alert */
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+code span.in { color: #60a0b0; font-weight: bold; font-style: italic; } /* Information */
+code span.kw { color: #007020; font-weight: bold; } /* Keyword */
+code span.op { color: #666666; } /* Operator */
+code span.ot { color: #007020; } /* Other */
+code span.pp { color: #bc7a00; } /* Preprocessor */
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+code span.vs { color: #4070a0; } /* VerbatimString */
+code span.wa { color: #60a0b0; font-weight: bold; font-style: italic; } /* Warning */
+  </style>
   <link rel="stylesheet" href="./bower_components/reveal.js/css/theme/black.css" id="theme">
   <!-- Printing and PDF exports -->
   <script>
@@ -40,16 +105,7 @@
   <p class="author">Trygve Laugstøl &lt;trygvis@trygvis.io&gt;</p>
 </section>
 
-<section><section id="what-is-iot" class="title-slide slide level1"><h1>What is IoT</h1></section><section id="wat-png" class="slide level2">
-<h2>wat png</h2>
-<p><img data-src="/home/trygvis/Dokumenter/Fritzing/bins/Untitled%20Sketch_bb.png" /></p>
-</section><section id="wat-pdf" class="slide level2">
-<h2>wat pdf</h2>
-<p><embed data-src="/home/trygvis/Dokumenter/Fritzing/bins/Untitled%20Sketch_bb.pdf" /></p>
-</section><section id="wat-svg" class="slide level2">
-<h2>wat svg</h2>
-<p><img data-src="/home/trygvis/Dokumenter/Fritzing/bins/Untitled%20Sketch_bb.svg" /></p>
-</section><section id="what-is-iot-1" class="slide level2">
+<section><section id="what-is-iot" class="title-slide slide level1"><h1>What is IoT</h1></section><section id="what-is-iot-1" class="slide level2">
 <h2>What is IoT</h2>
 <ul>
 <li>Not “a computer connected to the internet”
@@ -97,6 +153,11 @@
 </ul></li>
 </ul>
 <aside class="notes">
+<p>Might not have:</p>
+<ul>
+<li>RTC</li>
+</ul>
+<p>Extra features:</p>
 <ul>
 <li>IR</li>
 <li>UART</li>
@@ -310,9 +371,6 @@
 <aside class="notes">
 <p>Datasheet page 18</p>
 </aside>
-</section><section id="esp8266-details---arduino" class="slide level2">
-<h2>ESP8266 details - Arduino</h2>
-<p>https://github.com/esp8266/Arduino</p>
 </section></section>
 <section><section id="going-back-to-basics" class="title-slide slide level1"><h1>Going back to basics</h1></section><section id="what-is-the-internet-again" class="slide level2">
 <h2>What is the internet again?</h2>
@@ -409,6 +467,91 @@
 </section><section id="esp8266-software-layers" class="slide level2">
 <h2>ESP8266 software layers</h2>
 
+</section><section id="esp8266-arduino" class="slide level2">
+<h2>ESP8266 + Arduino</h2>
+<ul>
+<li>Standard Arduino IDE</li>
+<li>ESP8266 Arduino core
+<ul>
+<li>https://github.com/esp8266/Arduino</li>
+</ul></li>
+</ul>
+</section><section id="arduino-ide" class="slide level2">
+<h2>Arduino IDE</h2>
+<p><img data-src="images/arduino-ide.png" /></p>
+</section><section id="arduino-code-structure" class="slide level2">
+<h2>Arduino code structure</h2>
+<div class="sourceCode" id="cb1"><pre class="sourceCode .c++"><code class="sourceCode cpp"><a class="sourceLine" id="cb1-1" data-line-number="1"><span class="dt">void</span> setup() {</a>
+<a class="sourceLine" id="cb1-2" data-line-number="2">    <span class="co">// Called once</span></a>
+<a class="sourceLine" id="cb1-3" data-line-number="3">}</a>
+<a class="sourceLine" id="cb1-4" data-line-number="4"></a>
+<a class="sourceLine" id="cb1-5" data-line-number="5"><span class="dt">void</span> loop() {</a>
+<a class="sourceLine" id="cb1-6" data-line-number="6">    <span class="co">// Called repeatedly</span></a>
+<a class="sourceLine" id="cb1-7" data-line-number="7">}</a></code></pre></div>
+<aside class="notes">
+<p>MCU programming is often structured into:</p>
+<ul>
+<li>Configure
+<ul>
+<li>CPU</li>
+<li>GPIO ports</li>
+<li>MCU’s peripherals</li>
+<li>The rest of the board</li>
+<li>Configure application and callbacks.</li>
+</ul></li>
+<li>Sleep</li>
+</ul>
+<p>Arduino chooses to run the cpu at 100% instead of the sleep step..</p>
+</aside>
+</section><section id="arduino-file-structure" class="slide level2">
+<h2>Arduino file structure</h2>
+<pre><code>foo/
+  foo.ino
+  config.h</code></pre>
+<aside class="notes">
+<p><code>foo.ino</code> must always be in a <code>foo</code> directory.</p>
+<p>config.h is created by “new tab”.</p>
+</aside>
+</section><section id="generic-arduino-apis" class="slide level2">
+<h2>Generic Arduino APIs</h2>
+<div class="sourceCode" id="cb3"><pre class="sourceCode cpp"><code class="sourceCode cpp"><a class="sourceLine" id="cb3-1" data-line-number="1"><span class="co">// Pin: D0, D1, etc.</span></a>
+<a class="sourceLine" id="cb3-2" data-line-number="2"><span class="co">// Mode: OUTPUT, INPUT, INPUT_PULLUP</span></a>
+<a class="sourceLine" id="cb3-3" data-line-number="3"><span class="dt">void</span> pinMode(<span class="dt">uint8_t</span> pin, <span class="dt">uint8_t</span> mode);</a>
+<a class="sourceLine" id="cb3-4" data-line-number="4"></a>
+<a class="sourceLine" id="cb3-5" data-line-number="5"><span class="co">// State: HIGH, LOW, true/false, 1/0</span></a>
+<a class="sourceLine" id="cb3-6" data-line-number="6"><span class="dt">void</span> digitalWrite(<span class="dt">uint8_t</span> pin, <span class="dt">uint8_t</span> state);</a>
+<a class="sourceLine" id="cb3-7" data-line-number="7"><span class="dt">int</span> digitalRead(<span class="dt">uint8_t</span> pin);</a>
+<a class="sourceLine" id="cb3-8" data-line-number="8"></a>
+<a class="sourceLine" id="cb3-9" data-line-number="9"><span class="dt">unsigned</span> <span class="dt">long</span> now millis();</a>
+<a class="sourceLine" id="cb3-10" data-line-number="10"><span class="dt">unsigned</span> <span class="dt">long</span> now micros();</a></code></pre></div>
+</section><section id="esp-arduino-apis" class="slide level2">
+<h2>ESP Arduino APIs</h2>
+<div class="sourceCode" id="cb4"><pre class="sourceCode cpp"><code class="sourceCode cpp"><a class="sourceLine" id="cb4-1" data-line-number="1"><span class="kw">class</span> {</a>
+<a class="sourceLine" id="cb4-2" data-line-number="2">    <span class="dt">void</span> restart();</a>
+<a class="sourceLine" id="cb4-3" data-line-number="3">    <span class="dt">uint32_t</span> getFreeHeap();</a>
+<a class="sourceLine" id="cb4-4" data-line-number="4">    <span class="dt">uint32_t</span> getChipId();</a>
+<a class="sourceLine" id="cb4-5" data-line-number="5">} ESP;</a></code></pre></div>
+<p>// Usage ESP.restart();</p>
+</section><section id="esp-arduino-apis-1" class="slide level2">
+<h2>ESP Arduino APIs</h2>
+<div class="sourceCode" id="cb5"><pre class="sourceCode cpp"><code class="sourceCode cpp"><a class="sourceLine" id="cb5-1" data-line-number="1"><span class="kw">class</span> {</a>
+<a class="sourceLine" id="cb5-2" data-line-number="2">    String macAddress();</a>
+<a class="sourceLine" id="cb5-3" data-line-number="3"></a>
+<a class="sourceLine" id="cb5-4" data-line-number="4">    <span class="dt">wl_status_t</span> status();</a>
+<a class="sourceLine" id="cb5-5" data-line-number="5">    <span class="dt">int32_t</span> RSSI();</a>
+<a class="sourceLine" id="cb5-6" data-line-number="6"></a>
+<a class="sourceLine" id="cb5-7" data-line-number="7">    IPAddress localIP();</a>
+<a class="sourceLine" id="cb5-8" data-line-number="8">    IPAddress subnetMask();</a>
+<a class="sourceLine" id="cb5-9" data-line-number="9">    IPAddress gatewayIP();</a>
+<a class="sourceLine" id="cb5-10" data-line-number="10">    IPAddress dnsIP(<span class="dt">uint8_t</span> dns_no = <span class="dv">0</span>);</a>
+<a class="sourceLine" id="cb5-11" data-line-number="11">} WiFi;</a>
+<a class="sourceLine" id="cb5-12" data-line-number="12"></a>
+<a class="sourceLine" id="cb5-13" data-line-number="13"><span class="co">// Usage:</span></a>
+<a class="sourceLine" id="cb5-14" data-line-number="14"></a>
+<a class="sourceLine" id="cb5-15" data-line-number="15">Serial.println(WiFi.localIP().toString());</a></code></pre></div>
+<aside class="notes">
+<p>http://arduino-esp8266.readthedocs.io/en/latest/libraries.html</p>
+</aside>
 </section></section>
 <section><section id="lecture-mqtt" class="title-slide slide level1"><h1>Lecture: MQTT</h1></section><section id="mqtt" class="slide level2">
 <h2>MQTT</h2>
@@ -625,15 +768,41 @@
 <li>Generic bridges</li>
 </ul>
 </aside>
-</section></section>
-<section><section id="assignments" class="title-slide slide level1"><h1>Assignments</h1></section><section id="assignment-1-blink-a-led" class="slide level2">
-<h2>Assignment 1: Blink a led</h2>
-</section><section id="assignment-2-connect-to-wi-fi" class="slide level2">
-<h2>Assignment 2: Connect to Wi-Fi</h2>
-</section><section id="assignment-3-connect-to-mqtt-broker" class="slide level2">
-<h2>Assignment 3: Connect to MQTT broker</h2>
-</section><section id="assignment-4-network-play-time" class="slide level2">
-<h2>Assignment 4: Network play time</h2>
+</section><section id="mqtt-on-arduino" class="slide level2">
+<h2>MQTT on Arduino</h2>
+<p>PubSubClient is our MQTT client implementation.</p>
+<div class="sourceCode" id="cb6"><pre class="sourceCode cpp"><code class="sourceCode cpp"><a class="sourceLine" id="cb6-1" data-line-number="1">WiFiClient wifiClient;</a>
+<a class="sourceLine" id="cb6-2" data-line-number="2">PubSubClient mqtt(wifiClient);</a>
+<a class="sourceLine" id="cb6-3" data-line-number="3"></a>
+<a class="sourceLine" id="cb6-4" data-line-number="4"><span class="dt">void</span> callback(<span class="dt">char</span>* topic,</a>
+<a class="sourceLine" id="cb6-5" data-line-number="5">              byte* payload,</a>
+<a class="sourceLine" id="cb6-6" data-line-number="6">              <span class="dt">unsigned</span> <span class="dt">int</span> length);</a>
+<a class="sourceLine" id="cb6-7" data-line-number="7"></a>
+<a class="sourceLine" id="cb6-8" data-line-number="8"><span class="dt">void</span> setup() {</a>
+<a class="sourceLine" id="cb6-9" data-line-number="9">    <span class="co">// Configure WiFi</span></a>
+<a class="sourceLine" id="cb6-10" data-line-number="10">    mqtt.setServer(mqtt_server, <span class="dv">1883</span>);</a>
+<a class="sourceLine" id="cb6-11" data-line-number="11">    mqtt.setCallback(callback);</a>
+<a class="sourceLine" id="cb6-12" data-line-number="12">}</a></code></pre></div>
+</section><section id="mqtt-on-arduino-1" class="slide level2">
+<h2>MQTT on Arduino</h2>
+<div class="sourceCode" id="cb7"><pre class="sourceCode cpp"><code class="sourceCode cpp"><a class="sourceLine" id="cb7-1" data-line-number="1"><span class="dt">void</span> loop() {</a>
+<a class="sourceLine" id="cb7-2" data-line-number="2">    <span class="cf">if</span> (!mqtt.connected())</a>
+<a class="sourceLine" id="cb7-3" data-line-number="3">        reconnect();</a>
+<a class="sourceLine" id="cb7-4" data-line-number="4">    <span class="cf">else</span></a>
+<a class="sourceLine" id="cb7-5" data-line-number="5">        mqtt.loop();</a>
+<a class="sourceLine" id="cb7-6" data-line-number="6">    <span class="co">// Do work</span></a>
+<a class="sourceLine" id="cb7-7" data-line-number="7">}</a>
+<a class="sourceLine" id="cb7-8" data-line-number="8"></a>
+<a class="sourceLine" id="cb7-9" data-line-number="9"><span class="dt">void</span> reconnect() {</a>
+<a class="sourceLine" id="cb7-10" data-line-number="10">    <span class="cf">while</span> (!mqtt.<span class="fu">connect</span>(client_id));</a>
+<a class="sourceLine" id="cb7-11" data-line-number="11"></a>
+<a class="sourceLine" id="cb7-12" data-line-number="12">    mqtt.subscribe(topic_pattern);</a>
+<a class="sourceLine" id="cb7-13" data-line-number="13">}</a></code></pre></div>
+<aside class="notes">
+<p>This is blocking!</p>
+</aside>
+</section><section id="assignment-network-play-time" class="slide level2">
+<h2>Assignment: Network play time</h2>
 <ul>
 <li><p>Measure round trip time/latency. Measure UDP, TCP. Measure when the packet size is greater than the MTU</p></li>
 <li><p>Notice variations in RTT</p></li>
diff --git a/slides/what-is-iot-slides.pdf b/slides/what-is-iot-slides.pdf
index 49b1b5e..52c729b 100644
Binary files a/slides/what-is-iot-slides.pdf and b/slides/what-is-iot-slides.pdf differ
diff --git a/slides/what-is-iot-slides.tex b/slides/what-is-iot-slides.tex
index 582922b..8755756 100644
--- a/slides/what-is-iot-slides.tex
+++ b/slides/what-is-iot-slides.tex
@@ -502,15 +502,17 @@ maximum value is 64k, 65536.}
 \begin{frame}[fragile]{Arduino code structure}
 \protect\hypertarget{arduino-code-structure}{}
 
-\begin{verbatim}
-void setup() {
-    // Called once
-}
-
-void loop() {
-    // Called repeatedly
-}
-\end{verbatim}
+\begin{Shaded}
+\begin{Highlighting}[]
+\DataTypeTok{void}\NormalTok{ setup() \{}
+    \CommentTok{// Called once}
+\NormalTok{\}}
+
+\DataTypeTok{void}\NormalTok{ loop() \{}
+    \CommentTok{// Called repeatedly}
+\NormalTok{\}}
+\end{Highlighting}
+\end{Shaded}
 
 \note{MCU programming is often structured into:
 
@@ -558,15 +560,64 @@ config.h is created by “new tab”.}
 \begin{frame}[fragile]{Generic Arduino APIs}
 \protect\hypertarget{generic-arduino-apis}{}
 
-// Pin: D0, D1, etc. // Mode: OUTPUT, INPUT, INPUT\_PULLUP
+\begin{Shaded}
+\begin{Highlighting}[]
+\CommentTok{// Pin: D0, D1, etc.}
+\CommentTok{// Mode: OUTPUT, INPUT, INPUT_PULLUP}
+\DataTypeTok{void}\NormalTok{ pinMode(}\DataTypeTok{uint8_t}\NormalTok{ pin, }\DataTypeTok{uint8_t}\NormalTok{ mode);}
 
-\begin{verbatim}
-pinMode(pin, mode);
+\CommentTok{// State: HIGH, LOW, true/false, 1/0}
+\DataTypeTok{void}\NormalTok{ digitalWrite(}\DataTypeTok{uint8_t}\NormalTok{ pin, }\DataTypeTok{uint8_t}\NormalTok{ state);}
+\DataTypeTok{int}\NormalTok{ digitalRead(}\DataTypeTok{uint8_t}\NormalTok{ pin);}
 
-digitalWrite(pin, state);
+\DataTypeTok{unsigned} \DataTypeTok{long}\NormalTok{ now millis();}
+\DataTypeTok{unsigned} \DataTypeTok{long}\NormalTok{ now micros();}
+\end{Highlighting}
+\end{Shaded}
 
-state = digitalRead(pin);
-\end{verbatim}
+\end{frame}
+
+\begin{frame}[fragile]{ESP Arduino APIs}
+\protect\hypertarget{esp-arduino-apis}{}
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\KeywordTok{class}\NormalTok{ \{}
+    \DataTypeTok{void}\NormalTok{ restart();}
+    \DataTypeTok{uint32_t}\NormalTok{ getFreeHeap();}
+    \DataTypeTok{uint32_t}\NormalTok{ getChipId();}
+\NormalTok{\} ESP;}
+\end{Highlighting}
+\end{Shaded}
+
+// Usage ESP.restart();
+
+\end{frame}
+
+\begin{frame}[fragile]{ESP Arduino APIs}
+\protect\hypertarget{esp-arduino-apis-1}{}
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\KeywordTok{class}\NormalTok{ \{}
+\NormalTok{    String macAddress();}
+
+    \DataTypeTok{wl_status_t}\NormalTok{ status();}
+    \DataTypeTok{int32_t}\NormalTok{ RSSI();}
+
+\NormalTok{    IPAddress localIP();}
+\NormalTok{    IPAddress subnetMask();}
+\NormalTok{    IPAddress gatewayIP();}
+\NormalTok{    IPAddress dnsIP(}\DataTypeTok{uint8_t}\NormalTok{ dns_no = }\DecValTok{0}\NormalTok{);}
+\NormalTok{\} WiFi;}
+
+\CommentTok{// Usage:}
+
+\NormalTok{Serial.println(WiFi.localIP().toString());}
+\end{Highlighting}
+\end{Shaded}
+
+\note{http://arduino-esp8266.readthedocs.io/en/latest/libraries.html}
 
 \end{frame}
 
@@ -998,26 +1049,82 @@ releases at the same time.}
 
 \end{frame}
 
-\hypertarget{assignments}{%
-\section{Assignments}\label{assignments}}
+\begin{frame}[fragile]{MQTT on Arduino}
+\protect\hypertarget{mqtt-on-arduino}{}
+
+PubSubClient is our MQTT client implementation.
 
-\begin{frame}{Assignment 1: Blink a led}
-\protect\hypertarget{assignment-1-blink-a-led}{}
+\begin{Shaded}
+\begin{Highlighting}[]
+\NormalTok{WiFiClient wifiClient;}
+\NormalTok{PubSubClient mqtt(wifiClient);}
+
+\DataTypeTok{void}\NormalTok{ callback(}\DataTypeTok{char}\NormalTok{* topic,}
+\NormalTok{              byte* payload,}
+              \DataTypeTok{unsigned} \DataTypeTok{int}\NormalTok{ length);}
+
+\DataTypeTok{void}\NormalTok{ setup() \{}
+    \CommentTok{// Configure WiFi}
+\NormalTok{    mqtt.setServer(mqtt_server, }\DecValTok{1883}\NormalTok{);}
+\NormalTok{    mqtt.setCallback(callback);}
+\NormalTok{\}}
+\end{Highlighting}
+\end{Shaded}
+
+\end{frame}
+
+\begin{frame}[fragile]{MQTT on Arduino}
+\protect\hypertarget{mqtt-on-arduino-1}{}
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\DataTypeTok{void}\NormalTok{ loop() \{}
+    \ControlFlowTok{if}\NormalTok{ (!mqtt.connected())}
+\NormalTok{        reconnect();}
+    \ControlFlowTok{else}
+\NormalTok{        mqtt.loop();}
+    \CommentTok{// Do work}
+\NormalTok{\}}
+
+\DataTypeTok{void}\NormalTok{ reconnect() \{}
+    \ControlFlowTok{while}\NormalTok{ (!mqtt.}\FunctionTok{connect}\NormalTok{(client_id));}
+
+\NormalTok{    mqtt.subscribe(topic_pattern);}
+\NormalTok{\}}
+\end{Highlighting}
+\end{Shaded}
+
+\note{This is blocking!}
 
 \end{frame}
 
-\begin{frame}{Assignment 2: Connect to Wi-Fi}
-\protect\hypertarget{assignment-2-connect-to-wi-fi}{}
+\begin{frame}{Assignment: MQTT}
+\protect\hypertarget{assignment-mqtt}{}
 
 \end{frame}
 
-\begin{frame}{Assignment 3: Connect to MQTT broker}
-\protect\hypertarget{assignment-3-connect-to-mqtt-broker}{}
+\hypertarget{assignments}{%
+\section{Assignments}\label{assignments}}
+
+\begin{frame}{Assignment: Arduino}
+\protect\hypertarget{assignment-arduino}{}
+
+\begin{itemize}
+\tightlist
+\item
+  Hello world on serial console
+\item
+  Blink a led
+\item
+  Read the temperature every second, print to serial console
+\item
+  Print available heap
+\end{itemize}
 
 \end{frame}
 
-\begin{frame}{Assignment 4: Network play time}
-\protect\hypertarget{assignment-4-network-play-time}{}
+\begin{frame}{Assignment: Network play time}
+\protect\hypertarget{assignment-network-play-time}{}
 
 \begin{itemize}
 \item
diff --git a/slides/what-is-iot-text.pdf b/slides/what-is-iot-text.pdf
index 6d02221..e1c80ad 100644
Binary files a/slides/what-is-iot-text.pdf and b/slides/what-is-iot-text.pdf differ
diff --git a/slides/what-is-iot.md b/slides/what-is-iot.md
index ef11ca3..c3a74eb 100644
--- a/slides/what-is-iot.md
+++ b/slides/what-is-iot.md
@@ -376,17 +376,58 @@ config.h is created by "new tab".
 
 ## Generic Arduino APIs
 
+~~~c++
 // Pin: D0, D1, etc.
 // Mode: OUTPUT, INPUT, INPUT_PULLUP
+void pinMode(uint8_t pin, uint8_t mode);
+
+// State: HIGH, LOW, true/false, 1/0
+void digitalWrite(uint8_t pin, uint8_t state);
+int digitalRead(uint8_t pin);
+
+unsigned long now millis();
+unsigned long now micros();
+~~~
+
+## ESP Arduino APIs
 
 ~~~c++
-pinMode(pin, mode);
+class {
+    void restart();
+    uint32_t getFreeHeap();
+    uint32_t getChipId();
+} ESP;
+~~~
+
+// Usage
+ESP.restart();
 
-digitalWrite(pin, state);
+## ESP Arduino APIs
+
+~~~c++
+class {
+    String macAddress();
 
-state = digitalRead(pin);
+    wl_status_t status();
+    int32_t RSSI();
+
+    IPAddress localIP();
+    IPAddress subnetMask();
+    IPAddress gatewayIP();
+    IPAddress dnsIP(uint8_t dns_no = 0);
+} WiFi;
+
+// Usage:
+
+Serial.println(WiFi.localIP().toString());
 ~~~
 
+::: notes
+
+http://arduino-esp8266.readthedocs.io/en/latest/libraries.html
+
+:::
+
 # Lecture: MQTT
 
 ## MQTT
@@ -396,13 +437,17 @@ state = digitalRead(pin);
 
 ::: notes
 
-MQTT is *the* standard for IoT applications (and lots of other useful stuff to). Using HTTP is just silly.
+MQTT is *the* standard for IoT applications (and lots of other useful
+stuff to). Using HTTP is just silly.
 
 Supports SSL, and requires TCP.
 
-Has UDP-like semantics with "fire and forget" but on a higher level (the message always have to be delivered and ACKed by the broker, not it's final recipient.
+Has UDP-like semantics with "fire and forget" but on a higher level
+(the message always have to be delivered and ACKed by the broker, not
+it's final recipient.
 
-Version 3.1.1 er den som gjelder, V 3.1 er rar, de andre finnes ikke (før standardisering).
+Version 3.1.1 er den som gjelder, V 3.1 er rar, de andre finnes ikke
+(før standardisering).
 
 :::
 
@@ -600,15 +645,48 @@ In between are:
 
 :::
 
-# Assignments
+## MQTT on Arduino
 
-## Assignment 1: Blink a led
+PubSubClient is our MQTT client implementation.
 
-## Assignment 2: Connect to Wi-Fi
+~~~c++
+WiFiClient wifiClient;
+PubSubClient mqtt(wifiClient);
+
+void callback(char* topic,
+              byte* payload,
+              unsigned int length);
 
-## Assignment 3: Connect to MQTT broker
+void setup() {
+    // Configure WiFi
+    mqtt.setServer(mqtt_server, 1883);
+    mqtt.setCallback(callback);
+}
+~~~
+
+## MQTT on Arduino
+
+~~~c++
+void loop() {
+    if (!mqtt.connected())
+        reconnect();
+    else
+        mqtt.loop();
+    // Do work
+}
+
+void reconnect() {
+    while (!mqtt.connect(client_id));
+
+    mqtt.subscribe(topic_pattern);
+}
+~~~
+
+::: notes
+This is blocking!
+:::
 
-## Assignment 4: Network play time
+## Assignment: Network play time
 
 * Measure round trip time/latency. Measure UDP, TCP. Measure when the
   packet size is greater than the MTU
-- 
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