wip

8 files changed, 476 insertions, 1628 deletions

diff --git a/slides/Makefile b/slides/Makefile
index 727031c..4f2b761 100644
--- a/slides/Makefile
+++ b/slides/Makefile
@@ -1,9 +1,12 @@
-P=what-is-iot
+P=connected-arduino
 # Madrid Pittsburgh boxes
 SLIDE_THEME?=boxes
 PDFS=$(P)-text.pdf $(P)-slides.pdf
 HTMLS=$(P)-reveal.html
 
+BUILD_DIR=build
+TEMPLATE_DIR=templates
+TEMPLATE_BEAMER=$(TEMPLATE_DIR)/beamer.tex
 ifeq (1,$(QUICK))
 PP_DEFS+=QUICK
 PDF_ENGINE   = xelatex
@@ -17,11 +20,11 @@ endif
 RUN_PP_BEAMER=pp -DBEAMER $(patsubst %,-D%,$(PP_DEFS))
 RUN_PP_REVEALJS=pp -DREVEALJS $(patsubst %,-D%,$(PP_DEFS))
 RUN_PANDOC_BEAMER=pandoc -f markdown -t beamer $(PANDOC_ARGS) -V theme:$(SLIDE_THEME) \
-				  --pdf-engine=$(PDF_ENGINE)
+				  --pdf-engine=$(PDF_ENGINE) --template=$(TEMPLATE_BEAMER) -V toc-depth:4
 RUN_PANDOC_REVEALJS=pandoc -f markdown -t revealjs -s -V revealjs-url=./bower_components/reveal.js
 RUN_PANDOC_TEXT=pandoc -f markdown --pdf-engine=$(PDF_ENGINE)
 
-all: toc.md $(PDFS) $(HTMLS)
+all: toc.md $(PDFS)
 
 slides: $(P)-slides.tex $(P)-slides.pdf
 html: $(P)-reveal.html
@@ -42,28 +45,28 @@ spell: .$(P).md.spell
 $(P).md: Makefile
 	@touch $@
 
-include $(P).beamer.md.d
-include $(P).revealjs.md.d
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
 
-%.beamer.md: %.md .var/QUICK
+%.beamer.md: %.md
 	$(RUN_PP_BEAMER) < $< > $@
 
-%.beamer.md.d: %.md
+$(BUILD_DIR)/%.beamer.md.d: %.md | $(BUILD_DIR)
 	$(RUN_PP_BEAMER) -M $< < $< > $@
 
 %-text.pdf: %.beamer.md
 	$(RUN_PANDOC_TEXT) -o $@ $<
 
-%-slides.pdf: %.beamer.md .var/SLIDE_THEME
+%-slides.pdf: %.beamer.md $(TEMPLATE_BEAMER)
 	$(RUN_PANDOC_BEAMER) -o $@ $<
 
-%-slides.tex: %.beamer.md .var/SLIDE_THEME
+%-slides.tex: %.beamer.md $(TEMPLATE_BEAMER)
 	$(RUN_PANDOC_BEAMER) -o $@ $<
 
-%.revealjs.md: %.md# %.revealjs.md.d
+%.revealjs.md: %.md# $(BUILD_DIR)/%.revealjs.md.d
 	$(RUN_PP_REVEALJS) < $< > $@
 
-%.revealjs.md.d: %.md
+$(BUILD_DIR)/%.revealjs.md.d: %.md | $(BUILD_DIR)
 	$(RUN_PP_REVEALJS) -M $< < $< > $@
 
 %-reveal.html: %.revealjs.md
@@ -74,13 +77,11 @@ images/%.pdf: images/%.tex | images/pp-template Makefile
 	xelatex -output-directory=images $(patsubst %.tex,%-full.tex,$<)
 	mv $(patsubst %.pdf,%-full.pdf,$@) $@
 
+$(TEMPLATE_BEAMER): $(dir $(TEMPLATE_BEAMER))
+	pandoc --print-default-template=beamer > $@
 
-VARS=SLIDE_THEME QUICK
+$(dir $(TEMPLATE_BEAMER)):
+	mkdir -p $@
 
-define refresh =
-.var/$(1)::
-	@mkdir -p .var
-	@./refresh $$@ $(1) $($(1))
-endef
-
-$(foreach var,$(VARS),$(eval $(call refresh,$(var))))
+-include $(BUILD_DIR)/$(P).beamer.md.d
+-include $(BUILD_DIR)/$(P).revealjs.md.d
diff --git a/slides/what-is-iot-slides.pdf b/slides/connected-arduino-slides.pdf
index a62a47c..83e8750 100644
--- a/slides/what-is-iot-slides.pdf
+++ b/slides/connected-arduino-slides.pdf
diff --git a/slides/connected-arduino-text.pdf b/slides/connected-arduino-text.pdf
new file mode 100644
index 0000000..e5088b9
--- /dev/null
+++ b/slides/connected-arduino-text.pdf
diff --git a/slides/what-is-iot.md b/slides/connected-arduino.md
index 01e6477..6a6b5e7 100644
--- a/slides/what-is-iot.md
+++ b/slides/connected-arduino.md
@@ -7,6 +7,7 @@ header-includes:
             pdfborderstyle={/S/U/W 1}}
   - \usepackage{tikz}
     \usetikzlibrary{angles,arrows,arrows.meta,backgrounds,calc,chains,decorations,decorations.pathmorphing,decorations.pathreplacing,decorations.text,fit,matrix,positioning,quotes,shapes.arrows,shapes.geometric,shapes.symbols}
+
 !ifndef(QUICK)
 ~~~~~~
   - \usepackage{fontspec}
@@ -196,7 +197,7 @@ What differentiates a computer from an IoT device?
     * Wi-Fi
     * NB-IoT
     * LTE Cat-M
-    * LoRA
+    * LoRa
     * Proprietary radio
 
 ::: notes
@@ -215,80 +216,27 @@ Sparkfun and Adafruit etc sell modules with all of these technologies.
 
 :::
 
-## IoT Devices - Bluetooth 4/5 chips
-
-Chip     CPU        Freq   RAM  Flash Price
--------- ---------- ------ ---- ----- ------
-nRF52810 Cortex-M4  64 MHz  24k  192k  $1.88
-nRF52832 Cortex-M4F         32k  256k  $2.54
-                            64k  512k  $2.59
-nRF52840 Cortex-M4F        256k 1024k  $3.85
-
-* nRF52810: High performance, entry-level Bluetooth 4/ANT/2.4GHz SoC
-* nRF52832: High performance Bluetooth 4/ANT/2.4GHz SoC
-* nRF52840: Advanced multi-protocol System-on-Chip Supporting: Bluetooth 5, ANT/ANT+, 802.15.4 and 2.4GHz proprietary
-
-::: notes
-
-All quantities are 1000 pieces
-
-nRF51: https://www.digikey.no/products/en/rf-if-and-rfid/rf-transceiver-ics/879?k=nrf51822
-
-nRF52832: these have different packagings, not only difference price
-
-https://www.digikey.no/products/en/rf-if-and-rfid/rf-transceiver-ics/879?FV=1c0001%2Cffe0036f&quantity=3000&ColumnSort=1000011&page=1&k=nrf52832&pageSize=500&pkeyword=nrf52810
-
-nRF52810: High performance, entry-level Bluetooth 4/ANT/2.4GHz SoC
-nRF52832: High performance Bluetooth 4/ANT/2.4GHz SoC
-nRF52840: Advanced multi-protocol System-on-Chip Supporting: Bluetooth 5, ANT/ANT+, 802.15.4 and 2.4GHz proprietary
-
-:::
-
-## IoT Devices - LoRA
-
-### Modules
+## IoT Devices - Example chips
 
-Module          Data Rate Price
------           --------- ------
-RN2483A-I/RM104           $12.05 @ 250
-CMWX1ZZABZ-078  SX1276    $10.74 @ 1000
-RF-LORA-868-SO  SX1272	  $16.55 @ 1000
+Protocol      Chip          Specs
+------------- ----          -----
+Bluetooth 4/5 nRF52x        32-64 MHz, Cortex-M0/M4F,
+                            24-256k RAM, 192-1024 k Flash,
+                            $1.88-$3.85
+WiFi          ESP8266/ESP32 80MHz-160MHz, 1-2 cores,
+                            ~80k RAM, < $1 - $4.53
+LoRa          Semtech       $3.23 - $4.74
 
-### Chips
-
-Chip            Price
-----            -------
-SX1281          $3.23
-SX1272          $4.25
-SX1276          $4.25
-SX1279          $4.74
 
 ::: notes
 
-These modules require an external MCU, so does the chips.
-
-:::
-
-## IoT Devices - NB-IoT
+BT and Wi-Fi has many, many more chips. Technologies based on
+open/accessible standards. LoRa is much more closed and driven by a
+single company.
 
-Module                         Price
-------                         -----
-uBlox SARA-N210                ~$10 @ 100
-Sierra Wireless HL7800_1103933 $15.72
-
-## IoT Devices - Wi-Fi
-
-Chip    CPU            Freq     ROM   RAM    Price
------   -------        -------  ----- ------ ------
-ESP8266 Tensilica L106 160 MHz    N/A ~50 kB   < $1
-
-ESP32 - dual cpu, Wi-Fi, Bluetooth 4
-ESP32-D0WDQ6 2x Xtensa @ 160MHz  $ 4.53 @ 10
-
-::: notes
-
-The ESP8266's RAM depends on which firmware stack is used. Physical is probably 128k or most likely 64k.
+4.53 is quantity=10
 
+LoRa chips are just trancievers, an MCU with LoRa stack is required.
 :::
 
 ## ESP8266 details - Power usage
@@ -313,106 +261,6 @@ Datasheet page 18
 
 :::
 
-# Going back to basics
-
-## What is the internet again?
-
-## TCP/IP Layers
-
-!ifndef(QUICK)(
-\begin{center}
-!include(images/tcpip.pgf)
-\end{center}
-)
-
-## Packet encapsulation
-
-!ifndef(QUICK)(
-\begin{center}
-!include(images/ip-encapsulation.pgf)
-\end{center}
-)
-
-## Network interface
-
-* Ethernet
-    * 10BASE5, 10BASE2, 10BASE-T / 100BASE-TX / 1000BASE-TX
-* Wi-Fi
-    * 802.11a/b/g/n
-* RS-232
-
-::: notes
-
-Ethernet: Hubs and switches (that act on this level) is not on it's own
-layer. It is more of a implementation detail in the architecture diagram.
-
-RS-232 signaling is used in *all* MCUs, many have several ports
-available. It is extremely flexible, both used for implementing
-applications and debugging. Frequently an easy way to hack embedded
-devices. "USB dongles", "USB TTL" all use RS-232 signaling.
-
-Note that this only applies to its logical signals, not voltage
-levels. The signaling does not specify any max data rate, very high rates
-(>= 1Mbps) is often supported.
-
-:::
-
-## Internet
-
-* IP
-* ICMP
-
-## Transport
-
-* TCP
-* UDP
-* SCTP
-* QUIC
-
-## Layer 7: Application Layer
-
-* HTTP
-* DNS
-* MQTT
-* CoAP
-* (everything else..)
-
-!comment
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-## Details: IP
-
-!ifdef(REVEAL)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-![](images/ip-header.svg)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!ifdef(BEAMER)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!ifndef(QUICK)(![](images/ip-header.pdf))
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-::: notes
-
-Note that the "total length" field is 16 bits, 2 bytes, it's maximum value is 64k, 65536.
-
-:::
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-## Details: IP Header
-
-!ifndef(QUICK)(
-\begin{center}
-!include(images/ip-header.pgf)
-\end{center}
-)
-
-## Details: UDP Header
-
-!ifndef(QUICK)(
-\begin{center}
-!include(images/udp-header.pgf)
-\end{center}
-)
-
 # Lecture: MQTT
 
 ## MQTT
diff --git a/slides/templates/beamer.tex b/slides/templates/beamer.tex
new file mode 100644
index 0000000..08e21c1
--- /dev/null
+++ b/slides/templates/beamer.tex
@@ -0,0 +1,439 @@
+\PassOptionsToPackage{unicode=true}{hyperref} % options for packages loaded elsewhere
+\PassOptionsToPackage{hyphens}{url}
+$if(colorlinks)$
+\PassOptionsToPackage{dvipsnames,svgnames*,x11names*}{xcolor}
+$endif$$if(dir)$$if(latex-dir-rtl)$
+\PassOptionsToPackage{RTLdocument}{bidi}
+$endif$$endif$%
+\documentclass[$if(fontsize)$$fontsize$,$endif$$if(lang)$$babel-lang$,$endif$$if(papersize)$$papersize$paper,$endif$$if(beamer)$ignorenonframetext,$if(handout)$handout,$endif$$if(aspectratio)$aspectratio=$aspectratio$,$endif$$endif$$for(classoption)$$classoption$$sep$,$endfor$]{$documentclass$}
+$if(beamer)$
+\setbeamertemplate{caption}[numbered]
+\setbeamertemplate{caption label separator}{: }
+\setbeamercolor{caption name}{fg=normal text.fg}
+\beamertemplatenavigationsymbols$if(navigation)$$navigation$$else$empty$endif$
+$endif$
+$if(beamerarticle)$
+\usepackage{beamerarticle} % needs to be loaded first
+$endif$
+$if(fontfamily)$
+\usepackage[$for(fontfamilyoptions)$$fontfamilyoptions$$sep$,$endfor$]{$fontfamily$}
+$else$
+\usepackage{lmodern}
+$endif$
+$if(linestretch)$
+\usepackage{setspace}
+\setstretch{$linestretch$}
+$endif$
+\usepackage{amssymb,amsmath}
+\usepackage{ifxetex,ifluatex}
+\usepackage{fixltx2e} % provides \textsubscript
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \usepackage[$if(fontenc)$$fontenc$$else$T1$endif$]{fontenc}
+  \usepackage[utf8]{inputenc}
+  \usepackage{textcomp} % provides euro and other symbols
+\else % if luatex or xelatex
+$if(mathspec)$
+  \ifxetex
+    \usepackage{mathspec}
+  \else
+    \usepackage{unicode-math}
+  \fi
+$else$
+  \usepackage{unicode-math}
+$endif$
+  \defaultfontfeatures{Ligatures=TeX,Scale=MatchLowercase}
+$for(fontfamilies)$
+  \newfontfamily{$fontfamilies.name$}[$fontfamilies.options$]{$fontfamilies.font$}
+$endfor$
+$if(mainfont)$
+    \setmainfont[$for(mainfontoptions)$$mainfontoptions$$sep$,$endfor$]{$mainfont$}
+$endif$
+$if(sansfont)$
+    \setsansfont[$for(sansfontoptions)$$sansfontoptions$$sep$,$endfor$]{$sansfont$}
+$endif$
+$if(monofont)$
+    \setmonofont[Mapping=tex-ansi$if(monofontoptions)$,$for(monofontoptions)$$monofontoptions$$sep$,$endfor$$endif$]{$monofont$}
+$endif$
+$if(mathfont)$
+$if(mathspec)$
+  \ifxetex
+    \setmathfont(Digits,Latin,Greek)[$for(mathfontoptions)$$mathfontoptions$$sep$,$endfor$]{$mathfont$}
+  \else
+    \setmathfont[$for(mathfontoptions)$$mathfontoptions$$sep$,$endfor$]{$mathfont$}
+  \fi
+$else$
+  \setmathfont[$for(mathfontoptions)$$mathfontoptions$$sep$,$endfor$]{$mathfont$}
+$endif$
+$endif$
+$if(CJKmainfont)$
+  \ifxetex
+    \usepackage{xeCJK}
+    \setCJKmainfont[$for(CJKoptions)$$CJKoptions$$sep$,$endfor$]{$CJKmainfont$}
+  \fi
+$endif$
+$if(luatexjapresetoptions)$
+  \ifluatex
+    \usepackage[$for(luatexjapresetoptions)$$luatexjapresetoptions$$sep$,$endfor$]{luatexja-preset}
+  \fi
+$endif$
+$if(CJKmainfont)$
+  \ifluatex
+    \usepackage[$for(luatexjafontspecoptions)$$luatexjafontspecoptions$$sep$,$endfor$]{luatexja-fontspec}
+    \setmainjfont[$for(CJKoptions)$$CJKoptions$$sep$,$endfor$]{$CJKmainfont$}
+  \fi
+$endif$
+\fi
+$if(beamer)$
+$if(theme)$
+\usetheme[$for(themeoptions)$$themeoptions$$sep$,$endfor$]{$theme$}
+$endif$
+$if(colortheme)$
+\usecolortheme{$colortheme$}
+$endif$
+$if(fonttheme)$
+\usefonttheme{$fonttheme$}
+$endif$
+$if(mainfont)$
+\usefonttheme{serif} % use mainfont rather than sansfont for slide text
+$endif$
+$if(innertheme)$
+\useinnertheme{$innertheme$}
+$endif$
+$if(outertheme)$
+\useoutertheme{$outertheme$}
+$endif$
+$endif$
+% use upquote if available, for straight quotes in verbatim environments
+\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
+% use microtype if available
+\IfFileExists{microtype.sty}{%
+\usepackage[$for(microtypeoptions)$$microtypeoptions$$sep$,$endfor$]{microtype}
+\UseMicrotypeSet[protrusion]{basicmath} % disable protrusion for tt fonts
+}{}
+$if(indent)$
+$else$
+\IfFileExists{parskip.sty}{%
+\usepackage{parskip}
+}{% else
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{6pt plus 2pt minus 1pt}
+}
+$endif$
+$if(verbatim-in-note)$
+\usepackage{fancyvrb}
+$endif$
+$if(colorlinks)$
+\usepackage{xcolor}
+$endif$
+\usepackage{hyperref}
+\hypersetup{
+$if(title-meta)$
+            pdftitle={$title-meta$},
+$endif$
+$if(author-meta)$
+            pdfauthor={$author-meta$},
+$endif$
+$if(keywords)$
+            pdfkeywords={$for(keywords)$$keywords$$sep$, $endfor$},
+$endif$
+$if(colorlinks)$
+            colorlinks=true,
+            linkcolor=$if(linkcolor)$$linkcolor$$else$Maroon$endif$,
+            citecolor=$if(citecolor)$$citecolor$$else$Blue$endif$,
+            urlcolor=$if(urlcolor)$$urlcolor$$else$Blue$endif$,
+$else$
+            pdfborder={0 0 0},
+$endif$
+            breaklinks=true}
+
+\urlstyle{same}  % don't use monospace font for urls
+$if(verbatim-in-note)$
+\VerbatimFootnotes % allows verbatim text in footnotes
+$endif$
+$if(geometry)$
+\usepackage[$for(geometry)$$geometry$$sep$,$endfor$]{geometry}
+$endif$
+$if(beamer)$
+\newif\ifbibliography
+$endif$
+$if(listings)$
+\usepackage{listings}
+\newcommand{\passthrough}[1]{#1}
+$endif$
+$if(lhs)$
+\lstnewenvironment{code}{\lstset{language=Haskell,basicstyle=\small\ttfamily}}{}
+$endif$
+$if(highlighting-macros)$
+$highlighting-macros$
+$endif$
+$if(tables)$
+\usepackage{longtable,booktabs}
+$if(beamer)$
+\usepackage{caption}
+% These lines are needed to make table captions work with longtable:
+\makeatletter
+\def\fnum@table{\tablename~\thetable}
+\makeatother
+$else$
+% Fix footnotes in tables (requires footnote package)
+\IfFileExists{footnote.sty}{\usepackage{footnote}\makesavenoteenv{longtable}}{}
+$endif$
+$endif$
+$if(graphics)$
+\usepackage{graphicx,grffile}
+\makeatletter
+\def\maxwidth{\ifdim\Gin@nat@width>\linewidth\linewidth\else\Gin@nat@width\fi}
+\def\maxheight{\ifdim\Gin@nat@height>\textheight\textheight\else\Gin@nat@height\fi}
+\makeatother
+% Scale images if necessary, so that they will not overflow the page
+% margins by default, and it is still possible to overwrite the defaults
+% using explicit options in \includegraphics[width, height, ...]{}
+\setkeys{Gin}{width=\maxwidth,height=\maxheight,keepaspectratio}
+$endif$
+$if(beamer)$
+% Prevent slide breaks in the middle of a paragraph:
+\widowpenalties 1 10000
+\raggedbottom
+$if(section-titles)$
+\setbeamertemplate{part page}{
+\centering
+\begin{beamercolorbox}[sep=16pt,center]{part title}
+  \usebeamerfont{part title}\insertpart\par
+\end{beamercolorbox}
+}
+\setbeamertemplate{section page}{
+\centering
+\begin{beamercolorbox}[sep=12pt,center]{part title}
+  \usebeamerfont{section title}\insertsection\par
+\end{beamercolorbox}
+}
+\setbeamertemplate{subsection page}{
+\centering
+\begin{beamercolorbox}[sep=8pt,center]{part title}
+  \usebeamerfont{subsection title}\insertsubsection\par
+\end{beamercolorbox}
+}
+\AtBeginPart{
+  \frame{\partpage}
+}
+\AtBeginSection{
+  \ifbibliography
+  \else
+    \frame{\sectionpage}
+  \fi
+}
+\AtBeginSubsection{
+  \frame{\subsectionpage}
+}
+$endif$
+$endif$
+$if(links-as-notes)$
+% Make links footnotes instead of hotlinks:
+\DeclareRobustCommand{\href}[2]{#2\footnote{\url{#1}}}
+$endif$
+$if(strikeout)$
+\usepackage[normalem]{ulem}
+% avoid problems with \sout in headers with hyperref:
+\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
+$endif$
+\setlength{\emergencystretch}{3em}  % prevent overfull lines
+\providecommand{\tightlist}{%
+  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
+$if(numbersections)$
+\setcounter{secnumdepth}{$if(secnumdepth)$$secnumdepth$$else$5$endif$}
+$else$
+\setcounter{secnumdepth}{0}
+$endif$
+$if(beamer)$
+$else$
+$if(subparagraph)$
+$else$
+% Redefines (sub)paragraphs to behave more like sections
+\ifx\paragraph\undefined\else
+\let\oldparagraph\paragraph
+\renewcommand{\paragraph}[1]{\oldparagraph{#1}\mbox{}}
+\fi
+\ifx\subparagraph\undefined\else
+\let\oldsubparagraph\subparagraph
+\renewcommand{\subparagraph}[1]{\oldsubparagraph{#1}\mbox{}}
+\fi
+$endif$
+$endif$
+$if(pagestyle)$
+\pagestyle{$pagestyle$}
+$endif$
+
+% set default figure placement to htbp
+\makeatletter
+\def\fps@figure{htbp}
+\makeatother
+
+$for(header-includes)$
+$header-includes$
+$endfor$
+$if(lang)$
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \usepackage[shorthands=off,$for(babel-otherlangs)$$babel-otherlangs$,$endfor$main=$babel-lang$]{babel}
+$if(babel-newcommands)$
+  $babel-newcommands$
+$endif$
+\else
+  % load polyglossia as late as possible as it *could* call bidi if RTL lang (e.g. Hebrew or Arabic)
+  \usepackage{polyglossia}
+  \setmainlanguage[$polyglossia-lang.options$]{$polyglossia-lang.name$}
+$for(polyglossia-otherlangs)$
+  \setotherlanguage[$polyglossia-otherlangs.options$]{$polyglossia-otherlangs.name$}
+$endfor$
+\fi
+$endif$
+$if(dir)$
+\ifxetex
+  % load bidi as late as possible as it modifies e.g. graphicx
+  \usepackage{bidi}
+\fi
+\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
+  \TeXXeTstate=1
+  \newcommand{\RL}[1]{\beginR #1\endR}
+  \newcommand{\LR}[1]{\beginL #1\endL}
+  \newenvironment{RTL}{\beginR}{\endR}
+  \newenvironment{LTR}{\beginL}{\endL}
+\fi
+$endif$
+$if(natbib)$
+\usepackage[$natbiboptions$]{natbib}
+\bibliographystyle{$if(biblio-style)$$biblio-style$$else$plainnat$endif$}
+$endif$
+$if(biblatex)$
+\usepackage[$if(biblio-style)$style=$biblio-style$,$endif$$for(biblatexoptions)$$biblatexoptions$$sep$,$endfor$]{biblatex}
+$for(bibliography)$
+\addbibresource{$bibliography$}
+$endfor$
+$endif$
+
+$if(title)$
+\title{$title$$if(thanks)$\thanks{$thanks$}$endif$}
+$endif$
+$if(subtitle)$
+\providecommand{\subtitle}[1]{}
+\subtitle{$subtitle$}
+$endif$
+$if(author)$
+\author{$for(author)$$author$$sep$ \and $endfor$}
+$endif$
+$if(institute)$
+\providecommand{\institute}[1]{}
+\institute{$for(institute)$$institute$$sep$ \and $endfor$}
+$endif$
+\date{$date$}
+$if(beamer)$
+$if(titlegraphic)$
+\titlegraphic{\includegraphics{$titlegraphic$}}
+$endif$
+$if(logo)$
+\logo{\includegraphics{$logo$}}
+$endif$
+$endif$
+
+\iffalse
+\makeatletter
+% save the current definition of \beamer@@frametitle
+\let\nobookmarkbeamer@@frametitle\beamer@@frametitle
+% then patch it to do the bookmarks and/or TOC entries
+\apptocmd{\beamer@@frametitle}{%
+  % keep this to add the frame title to the TOC at the "subsection level"
+  \addtocontents{toc}{\protect\beamer@subsectionintoc{\the\c@section}{0}{#1}{\the\c@page}{\the\c@part}%
+        {\the\beamer@tocsectionnumber}}%
+  % keep this line to add a bookmark that shows up in the PDF TOC at the subsection level
+  \bookmark[page=\the\c@page,level=3]{#1}%
+  }%
+  {\message{** patching of \string\beamer@@frametitle succeeded **}}%
+  {\errmessage{** patching of \string\beamer@@frametitle failed **}}%
+
+\pretocmd{\beamer@checknoslide}{%
+  % ensure the bookmark is not created if the slide is filtered out
+  \let\beamer@@frametitle\nobookmarkbeamer@@frametitle
+  }%
+  {\message{** patching of \string\beamer@checknoslide succeeded **}}%
+  {\errmessage{** patching of \string\beamer@checknoslide failed **}}%
+
+\makeatother
+\fi
+
+\begin{document}
+$if(title)$
+$if(beamer)$
+\frame{\titlepage}
+$else$
+\maketitle
+$endif$
+$if(abstract)$
+\begin{abstract}
+$abstract$
+\end{abstract}
+$endif$
+$endif$
+
+$for(include-before)$
+$include-before$
+
+$endfor$
+$if(toc)$
+$if(beamer)$
+\begin{frame}
+%\tableofcontents[hideallsubsections]
+\tableofcontents[currentsection,subsubsectionstyle=hide]
+\end{frame}
+$else$
+{
+$if(colorlinks)$
+\hypersetup{linkcolor=$if(toccolor)$$toccolor$$else$$endif$}
+$endif$
+\setcounter{tocdepth}{$toc-depth$}
+\tableofcontents
+}
+$endif$
+$endif$
+$if(lot)$
+\listoftables
+$endif$
+$if(lof)$
+\listoffigures
+$endif$
+$body$
+
+$if(natbib)$
+$if(bibliography)$
+$if(biblio-title)$
+$if(book-class)$
+\renewcommand\bibname{$biblio-title$}
+$else$
+\renewcommand\refname{$biblio-title$}
+$endif$
+$endif$
+$if(beamer)$
+\begin{frame}[allowframebreaks]{$biblio-title$}
+\bibliographytrue
+$endif$
+\bibliography{$for(bibliography)$$bibliography$$sep$,$endfor$}
+$if(beamer)$
+\end{frame}
+$endif$
+
+$endif$
+$endif$
+$if(biblatex)$
+$if(beamer)$
+\begin{frame}[allowframebreaks]{$biblio-title$}
+\bibliographytrue
+\printbibliography[heading=none]
+\end{frame}
+$else$
+\printbibliography$if(biblio-title)$[title=$biblio-title$]$endif$
+$endif$
+
+$endif$
+$for(include-after)$
+$include-after$
+
+$endfor$
+\end{document}
diff --git a/slides/toc.md b/slides/toc.md
index cdc431e..6e54e03 100644
--- a/slides/toc.md
+++ b/slides/toc.md
@@ -14,24 +14,8 @@
     * IoT is just a concept
     * What is an IoT Device?
     * What is an IoT Device?
-    * IoT Devices - Bluetooth 4/5 chips
-    * IoT Devices - LoRA
-### Modules
-### Chips
-    * IoT Devices - NB-IoT
-    * IoT Devices - Wi-Fi
+    * IoT Devices - Example chips
     * ESP8266 details - Power usage
-* Going back to basics
-    * What is the internet again?
-    * TCP/IP Layers
-    * Packet encapsulation
-    * Network interface
-    * Internet
-    * Transport
-    * Layer 7: Application Layer
-    * Details: IP
-    * Details: IP Header
-    * Details: UDP Header
 * Lecture: MQTT
     * MQTT
     * Device and application architecture with MQTT
diff --git a/slides/what-is-iot-slides.tex b/slides/what-is-iot-slides.tex
deleted file mode 100644
index 1b65fc0..0000000
--- a/slides/what-is-iot-slides.tex
+++ /dev/null
@@ -1,1424 +0,0 @@
-\hypertarget{nodemcu}{%
-\section{NodeMCU}\label{nodemcu}}
-
-\begin{frame}{NodeMCU hardware}
-\protect\hypertarget{nodemcu-hardware}{}
-
-\includegraphics{images/NodeMCU-–-Board-de-desarrollo-con-módulo-ESP8266-WiFi-y-Lua-4.jpg}
-
-\end{frame}
-
-\begin{frame}{NodeMCU hardware}
-\protect\hypertarget{nodemcu-hardware-1}{}
-
-\begin{center}
-\begin{tikzpicture}
-
-\path
-    (0, 0) node(flash)[draw, rectangle,
-    minimum height=1cm, minimum width=2cm] {Flash}
-
-    (0, 1.5) node(esp8266)[draw, rectangle,
-    minimum height=1cm, minimum width=2cm] {ESP8266}
-
-    (3.5, 1.5) node(cp201x)[draw, rectangle,
-    minimum height=0.75cm, minimum width=1cm]
-    {CP201x}
-
-    (5.5, 1.5) node(usb)[]
-    {USB}
-;
-
-\draw[-] (esp8266) -- node[node font=\footnotesize, right]{QSPI} (flash);
-\draw[-] (esp8266) -- node[node font=\footnotesize, above]{UART} (cp201x) -- (usb);
-
-\node[rectangle, draw, fit=(esp8266) (flash), inner sep=2 mm,
-    label={[name=esp12_label,anchor=south]ESP-12}]
-    (esp12){};
-
-\node[rectangle, draw, thick, fit=(esp12_label) (esp12) (cp201x), inner sep=3 mm,
-    label={[anchor=north]south:NodeMCU}]
-    (nodemcu){};
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{ESP8266 software layers}
-\protect\hypertarget{esp8266-software-layers}{}
-
-\begin{center}
-\begin{tikzpicture}
-
-\node (rect_hw) [rectangle, draw, anchor=south west,
-    minimum width=6 cm, minimum height=1 cm,
-    label={[anchor=south]center:ESP8266 Hardware}] at (0, 0) {};
-
-\draw[thick] (-0.5, 1.25) -- (6.5, 1.25) ;
-
-\node  [rectangle, draw, anchor=south west,
-    minimum width=4 cm, minimum height=1 cm,
-    label={[anchor=south]center:ESP SDK}] at (0, 1.5) {};
-
-\node [rectangle, draw, anchor=south west,
-    minimum width=2 cm, minimum height=1 cm,
-    label={[align=center, text width=1cm]center:GCC  libc}] at (4, 1.5) {};
-
-\node [rectangle, draw, anchor=south west,
-    minimum width=6 cm, minimum height=1 cm,
-    label={[anchor=south]center:ESP interface}] at (0, 2.5) {};
-
-\node [rectangle, draw, anchor=south west,
-    minimum width=2 cm, minimum height=1 cm,
-    label={[align=center, text width= 2cm]center:Generic Arduino}] at (0, 3.5) {};
-
-\node [rectangle, draw, anchor=south west,
-    minimum width=2 cm, minimum height=1 cm,
-    label={[align=center, text width= 2cm]center:Ethernet}] at (2, 3.5) {};
-
-\node [rectangle, draw, anchor=south west,
-    minimum width=2 cm, minimum height=1 cm,
-    label={[align=center, text width= 2cm]center:ESP APIs}] at (4, 3.5) {};
-
-\draw [decorate, decoration={brace,amplitude=5pt, raise=-4pt}] (-0.5,2.5) -- (-0.5,4.5) node [black,midway,rotate=90, above] {Arduino};
-
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{ESP8266 + Arduino}
-\protect\hypertarget{esp8266-arduino}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Standard Arduino IDE
-\item
-  ESP8266 Arduino core
-
-  \begin{itemize}
-  \tightlist
-  \item
-    https://github.com/esp8266/Arduino
-  \end{itemize}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{Arduino IDE}
-\protect\hypertarget{arduino-ide}{}
-
-\includegraphics{images/arduino-ide.png}
-
-\end{frame}
-
-\begin{frame}[fragile]{Arduino code structure}
-\protect\hypertarget{arduino-code-structure}{}
-
-\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:
-
-\begin{itemize}
-\tightlist
-\item
-  Configure
-
-  \begin{itemize}
-  \tightlist
-  \item
-    CPU
-  \item
-    GPIO ports
-  \item
-    MCU’s peripherals
-  \item
-    The rest of the board
-  \item
-    Configure application and callbacks.
-  \end{itemize}
-\item
-  Sleep
-\end{itemize}
-
-Arduino chooses to run the cpu at 100\% instead of the sleep step..}
-
-\end{frame}
-
-\begin{frame}[fragile]{Arduino file structure}
-\protect\hypertarget{arduino-file-structure}{}
-
-\begin{verbatim}
-foo/
-  foo.ino
-  config.h
-\end{verbatim}
-
-\note{\texttt{foo.ino} must always be in a \texttt{foo} directory.
-
-config.h is created by “new tab”.}
-
-\end{frame}
-
-\begin{frame}[fragile]{Generic Arduino APIs}
-\protect\hypertarget{generic-arduino-apis}{}
-
-\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);}
-
-\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);}
-
-\DataTypeTok{unsigned} \DataTypeTok{long}\NormalTok{ now millis();}
-\DataTypeTok{unsigned} \DataTypeTok{long}\NormalTok{ now micros();}
-\end{Highlighting}
-\end{Shaded}
-
-\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{    ...}
-\NormalTok{\} ESP;}
-
-\CommentTok{// Usage}
-\NormalTok{ESP.restart();}
-\end{Highlighting}
-\end{Shaded}
-
-\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{    ...}
-\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}
-
-\hypertarget{what-is-iot}{%
-\section{What is IoT}\label{what-is-iot}}
-
-\begin{frame}{What is IoT}
-\protect\hypertarget{what-is-iot-1}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Not “a computer connected to the internet”
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Then it is really just another computer connected to the internet
-  \end{itemize}
-\item
-  Must be something else
-
-  \begin{itemize}
-  \tightlist
-  \item
-    It is simply devices that are resource constrained
-
-    \begin{itemize}
-    \tightlist
-    \item
-      Usually in more than one way
-    \end{itemize}
-  \end{itemize}
-\item
-  Autonomous operation, the connection might not be permanent
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{IoT is just a concept}
-\protect\hypertarget{iot-is-just-a-concept}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \emph{The Internet of Things (IoT) is the network of physical devices,
-  vehicles, home appliances and other items embedded with electronics,
-  software, sensors, actuators, and connectivity which enables these
-  objects to connect and exchange data.}\footnote<.->{Wikipedia
-    “Internet of Things”}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{What is an IoT Device?}
-\protect\hypertarget{what-is-an-iot-device}{}
-
-\note{As for their definition.
-
-What differentiates a computer from an IoT device?}
-
-\end{frame}
-
-\begin{frame}{What is an IoT Device?}
-\protect\hypertarget{what-is-an-iot-device-1}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Constrained in (one or more of):
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Memory
-  \item
-    CPU
-  \item
-    Network bandwidth and/or latency
-  \item
-    Storage
-  \end{itemize}
-\item
-  Has connectivity
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Bluetooth
-  \item
-    Wi-Fi
-  \item
-    NB-IoT
-  \item
-    LTE Cat-M
-  \item
-    LoRA
-  \item
-    Proprietary radio
-  \end{itemize}
-\end{itemize}
-
-\note{Might not have:
-
-\begin{itemize}
-\tightlist
-\item
-  RTC
-\end{itemize}
-
-Extra features:
-
-\begin{itemize}
-\tightlist
-\item
-  IR
-\item
-  UART
-\item
-  CAN
-\end{itemize}
-
-Sparkfun and Adafruit etc sell modules with all of these technologies.}
-
-\end{frame}
-
-\begin{frame}{IoT Devices - Bluetooth 4/5 chips}
-\protect\hypertarget{iot-devices---bluetooth-45-chips}{}
-
-\begin{longtable}[]{@{}llllll@{}}
-\toprule
-Chip & CPU & Freq & RAM & Flash & Price\tabularnewline
-\midrule
-\endhead
-nRF52810 & Cortex-M4 & 64 MHz & 24k & 192k & \$1.88\tabularnewline
-nRF52832 & Cortex-M4F & & 32k & 256k & \$2.54\tabularnewline
-& & & 64k & 512k & \$2.59\tabularnewline
-nRF52840 & Cortex-M4F & & 256k & 1024k & \$3.85\tabularnewline
-\bottomrule
-\end{longtable}
-
-\begin{itemize}
-\tightlist
-\item
-  nRF52810: High performance, entry-level Bluetooth 4/ANT/2.4GHz SoC
-\item
-  nRF52832: High performance Bluetooth 4/ANT/2.4GHz SoC
-\item
-  nRF52840: Advanced multi-protocol System-on-Chip Supporting: Bluetooth
-  5, ANT/ANT+, 802.15.4 and 2.4GHz proprietary
-\end{itemize}
-
-\note{All quantities are 1000 pieces
-
-nRF51:
-https://www.digikey.no/products/en/rf-if-and-rfid/rf-transceiver-ics/879?k=nrf51822
-
-nRF52832: these have different packagings, not only difference price
-
-https://www.digikey.no/products/en/rf-if-and-rfid/rf-transceiver-ics/879?FV=1c0001\%2Cffe0036f\&quantity=3000\&ColumnSort=1000011\&page=1\&k=nrf52832\&pageSize=500\&pkeyword=nrf52810
-
-nRF52810: High performance, entry-level Bluetooth 4/ANT/2.4GHz SoC
-nRF52832: High performance Bluetooth 4/ANT/2.4GHz SoC nRF52840: Advanced
-multi-protocol System-on-Chip Supporting: Bluetooth 5, ANT/ANT+,
-802.15.4 and 2.4GHz proprietary}
-
-\end{frame}
-
-\begin{frame}{IoT Devices - LoRA}
-\protect\hypertarget{iot-devices---lora}{}
-
-\begin{block}{Modules}
-
-\begin{longtable}[]{@{}lll@{}}
-\toprule
-Module & Data Rate & Price\tabularnewline
-\midrule
-\endhead
-RN2483A-I/RM104 & & \$12.05 @ 250\tabularnewline
-CMWX1ZZABZ-078 & SX1276 & \$10.74 @ 1000\tabularnewline
-RF-LORA-868-SO & SX1272 & \$16.55 @ 1000\tabularnewline
-\bottomrule
-\end{longtable}
-
-\end{block}
-
-\begin{block}{Chips}
-
-\begin{longtable}[]{@{}ll@{}}
-\toprule
-Chip & Price\tabularnewline
-\midrule
-\endhead
-SX1281 & \$3.23\tabularnewline
-SX1272 & \$4.25\tabularnewline
-SX1276 & \$4.25\tabularnewline
-SX1279 & \$4.74\tabularnewline
-\bottomrule
-\end{longtable}
-
-\note{These modules require an external MCU, so does the chips.}
-
-\end{block}
-
-\end{frame}
-
-\begin{frame}{IoT Devices - NB-IoT}
-\protect\hypertarget{iot-devices---nb-iot}{}
-
-\begin{longtable}[]{@{}ll@{}}
-\toprule
-Module & Price\tabularnewline
-\midrule
-\endhead
-uBlox SARA-N210 & \textasciitilde{}\$10 @ 100\tabularnewline
-Sierra Wireless HL7800\_1103933 & \$15.72\tabularnewline
-\bottomrule
-\end{longtable}
-
-\end{frame}
-
-\begin{frame}{IoT Devices - Wi-Fi}
-\protect\hypertarget{iot-devices---wi-fi}{}
-
-\begin{longtable}[]{@{}llllll@{}}
-\toprule
-Chip & CPU & Freq & ROM & RAM & Price\tabularnewline
-\midrule
-\endhead
-ESP8266 & Tensilica L106 & 160 MHz & N/A & \textasciitilde{}50 kB &
-\textless{} \$1\tabularnewline
-\bottomrule
-\end{longtable}
-
-ESP32 - dual cpu, Wi-Fi, Bluetooth 4 ESP32-D0WDQ6 2x Xtensa @ 160MHz \$
-4.53 @ 10
-
-\note{The ESP8266’s RAM depends on which firmware stack is used.
-Physical is probably 128k or most likely 64k.}
-
-\end{frame}
-
-\begin{frame}{ESP8266 details - Power usage}
-\protect\hypertarget{esp8266-details---power-usage}{}
-
-\begin{longtable}[]{@{}lr@{}}
-\toprule
-\begin{minipage}[b]{0.35\columnwidth}\raggedright
-State\strut
-\end{minipage} & \begin{minipage}[b]{0.22\columnwidth}\raggedleft
-Current usage\strut
-\end{minipage}\tabularnewline
-\midrule
-\endhead
-\begin{minipage}[t]{0.35\columnwidth}\raggedright
-Off\strut
-\end{minipage} & \begin{minipage}[t]{0.22\columnwidth}\raggedleft
-0.5 µA\strut
-\end{minipage}\tabularnewline
-\begin{minipage}[t]{0.35\columnwidth}\raggedright
-Deep sleep with RTC\strut
-\end{minipage} & \begin{minipage}[t]{0.22\columnwidth}\raggedleft
-20 µA\strut
-\end{minipage}\tabularnewline
-\begin{minipage}[t]{0.35\columnwidth}\raggedright
-Light sleep (with Wi-Fi)\strut
-\end{minipage} & \begin{minipage}[t]{0.22\columnwidth}\raggedleft
-1 mA\strut
-\end{minipage}\tabularnewline
-\begin{minipage}[t]{0.35\columnwidth}\raggedright
-Sleep with peripherials\strut
-\end{minipage} & \begin{minipage}[t]{0.22\columnwidth}\raggedleft
-15 mA\strut
-\end{minipage}\tabularnewline
-\begin{minipage}[t]{0.35\columnwidth}\raggedright
-TX\strut
-\end{minipage} & \begin{minipage}[t]{0.22\columnwidth}\raggedleft
-170 mA\strut
-\end{minipage}\tabularnewline
-\bottomrule
-\end{longtable}
-
-\note{Datasheet page 18}
-
-\end{frame}
-
-\hypertarget{going-back-to-basics}{%
-\section{Going back to basics}\label{going-back-to-basics}}
-
-\begin{frame}{What is the internet again?}
-\protect\hypertarget{what-is-the-internet-again}{}
-
-\end{frame}
-
-\begin{frame}{TCP/IP Layers}
-\protect\hypertarget{tcpip-layers}{}
-
-\begin{center}
-\begin{tikzpicture}[
-mybox/.style={draw, rectangle, minimum width=4cm, minimum height=1 cm,font=\bfseries}
-]
-
-%\draw (0,0) rectangle (3cm, 1cm) {wat};
-
-\node at (0, -0) [mybox] {Application};
-\node at (0, -1) [mybox] {Transport};
-\node at (0, -2) [mybox] {Internet};
-\node at (0, -3)[mybox] {Network interface};
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{Packet encapsulation}
-\protect\hypertarget{packet-encapsulation}{}
-
-\begin{center}
-\begin{tikzpicture}[
-mybox/.style={
-    draw,
-    rectangle,
-    minimum height=1 cm,
-    anchor=west,
-    align=center,
-    font=\bfseries}
-]
-
-%\draw (0,0) rectangle (3cm, 1cm) {wat};
-
-\node at (0 cm, 0 cm) [mybox, minimum width=2cm, text width=1.7cm] {Frame header};
-\node at (2 cm, 0 cm) [mybox, minimum width=6cm] {Frame data};
-\node at (8 cm, 0 cm) [mybox, minimum width=2cm, text width=1.7cm] {Frame footer};
-
-\node at (2 cm, 1.1 cm) [mybox, minimum width=2cm] {IP header};
-\node at (4 cm, 1.1 cm) [mybox, minimum width=4cm] {IP Data};
-
-\node at (4 cm, 2.2 cm) [mybox, minimum width=2cm, text width=1.7 cm] {UDP header};
-\node at (6 cm, 2.2 cm) [mybox, minimum width=2cm, text width=1.7 cm] {UDP Data};
-
-\node at (6 cm, 3.3 cm) [mybox, minimum width=2cm, text width=1.7 cm] {Data};
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{Network interface}
-\protect\hypertarget{network-interface}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Ethernet
-
-  \begin{itemize}
-  \tightlist
-  \item
-    10BASE5, 10BASE2, 10BASE-T / 100BASE-TX / 1000BASE-TX
-  \end{itemize}
-\item
-  Wi-Fi
-
-  \begin{itemize}
-  \tightlist
-  \item
-    802.11a/b/g/n
-  \end{itemize}
-\item
-  RS-232
-\end{itemize}
-
-\note{Ethernet: Hubs and switches (that act on this level) is not on
-it’s own layer. It is more of a implementation detail in the
-architecture diagram.
-
-RS-232 signaling is used in \emph{all} MCUs, many have several ports
-available. It is extremely flexible, both used for implementing
-applications and debugging. Frequently an easy way to hack embedded
-devices. “USB dongles”, “USB TTL” all use RS-232 signaling.
-
-Note that this only applies to its logical signals, not voltage levels.
-The signaling does not specify any max data rate, very high rates
-(\textgreater{}= 1Mbps) is often supported.}
-
-\end{frame}
-
-\begin{frame}{Internet}
-\protect\hypertarget{internet}{}
-
-\begin{itemize}
-\tightlist
-\item
-  IP
-\item
-  ICMP
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{Transport}
-\protect\hypertarget{transport}{}
-
-\begin{itemize}
-\tightlist
-\item
-  TCP
-\item
-  UDP
-\item
-  SCTP
-\item
-  QUIC
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{Layer 7: Application Layer}
-\protect\hypertarget{layer-7-application-layer}{}
-
-\begin{itemize}
-\tightlist
-\item
-  HTTP
-\item
-  DNS
-\item
-  MQTT
-\item
-  CoAP
-\item
-  (everything else..)
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{Details: IP Header}
-\protect\hypertarget{details-ip-header}{}
-
-\begin{center}
-\scalebox{0.5}{
-\begin{tikzpicture}[
-every node/.style={font=\bfseries},
-basebox/.style={anchor=north west, minimum height=2em, draw, rectangle},
-bitbox/.style={basebox, minimum width=2em},
-bytebox/.style={basebox, minimum width=16em},
-wordbox/.style={basebox, minimum width=32em},
-qwordbox/.style={basebox, minimum width=64em},
-]
-
-\path
-(-9em, 2em) node[basebox, minimum width=5em] {Offsets}
-(-9em, 0em) node[basebox, minimum width=5em] {Octet}
-(-4em, 2em) node[basebox, minimum width=4em] {Octet}
-(-4em, 0em) node[basebox, minimum width=4em] {Bit}
-;
-
-\foreach \x in {0,...,3}
-    \node[bytebox] at (\x * 16em, 2em) {\scriptsize \x};
-\foreach \x in {0,...,31}
-    \node[bitbox] at (\x * 2em, 0em) {\scriptsize \x};
-
-\foreach \x in {0,32,...,160}
-    \node[basebox, minimum width=4em] at (-4em, \x * -1/16*1em - 2em) {\scriptsize \x};
-
-\foreach \x in {0,4,...,20}
-    \node[basebox, minimum width=5em] at (-9em, \x * -0.5em - 2em) {\scriptsize \x};
-
-\path
-(0em, -1 * 2em) node[basebox, minimum width=8em] {Version}
-(8em, -1 * 2em) node[basebox, minimum width=8em] {IHL}
-(16em, -1 * 2em) node[basebox, minimum width=16em] {TOS}
-(32em, -1 * 2em) node[wordbox] {Packet length}
-
-(0em, -2 * 2em) node[wordbox] {Identification}
-(32em, -2 * 2em) node[bitbox] {X}
-(34em, -2 * 2em) node[bitbox] {D}
-(36em, -2 * 2em) node[bitbox] {M}
-(38em, -2 * 2em) node[basebox, minimum width=26em] {Fragement offset}
-
-(0em, -3 * 2em) node[bytebox] {TTL}
-(16em, -3 * 2em) node[bytebox] {Protocol}
-(32em, -3 * 2em) node[wordbox] {Header checksum}
-
-(0em, -4 * 2em) node[qwordbox] {Source ip address}
-(0em, -5 * 2em) node[qwordbox] {Destination ip address}
-(0em, -6 * 2em) node[qwordbox] {Options (variable length)}
-
-%(0em, -7 * 2em) node[qwordbox, minimum height=4 em] {Payload}
-;
-
-\end{tikzpicture}
-}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{Details: UDP Header}
-\protect\hypertarget{details-udp-header}{}
-
-\begin{center}
-\scalebox{0.5}{
-\begin{tikzpicture}[
-every node/.style={font=\bfseries},
-basebox/.style={anchor=west, minimum height=2em, draw, rectangle},
-bitbox/.style={basebox, minimum width=2em},
-bytebox/.style={basebox, minimum width=16em},
-wordbox/.style={basebox, minimum width=32em},
-qwordbox/.style={basebox, minimum width=64em},
-]
-
-\path
-(-9em, 2em) node[basebox, minimum width=5em] {Offsets}
-(-9em, 0em) node[basebox, minimum width=5em] {Octet}
-(-4em, 2em) node[basebox, minimum width=4em] {Octet}
-(-4em, 0em) node[basebox, minimum width=4em] {Bit}
-;
-
-\foreach \x in {0,...,3}
-    \node[bytebox] at (\x * 16em, 2em) {\scriptsize \x};
-\foreach \x in {0,...,31}
-    \node[bitbox] at (\x * 2em, 0em) {\scriptsize \x};
-
-\node[basebox, minimum width=4em] at (-4em, -2em) {\scriptsize 0};
-\node[basebox, minimum width=4em] at (-4em, -4em) {\scriptsize 32};
-
-\node[basebox, minimum width=5em] at (-9em, -2em) {\scriptsize 0};
-\node[basebox, minimum width=5em] at (-9em, -4em) {\scriptsize 4};
-
-\path
-( 0 * 2em, -1 * 2em) node[wordbox] {source port}
-(16 * 2em, -1 * 2em) node[wordbox] {destination port}
-( 0 * 2em, -2 * 2em) node[wordbox] {length}
-(16 * 2em, -2 * 2em) node[wordbox] {checksum}
-;
-
-\end{tikzpicture}
-}
-
-\end{center}
-
-\end{frame}
-
-\hypertarget{lecture-mqtt}{%
-\section{Lecture: MQTT}\label{lecture-mqtt}}
-
-\begin{frame}{MQTT}
-\protect\hypertarget{mqtt}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \emph{Message Queuing Telemetry Transport}
-\item
-  \href{https://en.wikipedia.org/wiki/MQTT}{Wikipedia: MQTT}
-\end{itemize}
-
-\note{MQTT is \emph{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.
-
-Version 3.1.1 er den som gjelder, V 3.1 er rar, de andre finnes ikke
-(før standardisering).}
-
-\end{frame}
-
-\begin{frame}{Device and application architecture with MQTT}
-\protect\hypertarget{device-and-application-architecture-with-mqtt}{}
-
-\begin{center}
-\begin{tikzpicture}
-
-\path
-    (-3 cm, 0) node (c1_label) {Device \#1}
-    ( 0 cm, 0) node (c2_label) {Device \#2}
-    ( 3 cm, 0) node (c3_label) {Device \#3}
-
-    (0, -3 cm) node (broker_label) {Broker}
-    (0, -6 cm) node (central_label) {Central}
-;
-
-\node (c1)[draw, circle, fit=(c1_label)] {};
-\node (c2)[draw, circle, fit=(c2_label)] {};
-\node (c3)[draw, circle, fit=(c3_label)] {};
-\node (broker)[draw, rectangle, thick, inner ysep=5 mm, inner xsep=10 mm, fit=(broker_label)] {};
-\node (central) at (central_label) [draw, circle, text width=2 cm] {};
-
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c1) to [bend right] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c2) -- (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c3) to [bend left] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (central) -- (broker);
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{MQTT - Implementations}
-\protect\hypertarget{mqtt---implementations}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Mosquitto
-\item
-  Eclipse Paho
-\item
-  RabbitMQ
-\item
-  ActiveMQ
-\end{itemize}
-
-\note{RabbitMQ has a separate connector that must be installed Not sure
-about ActiveMQ but it is at least a part of the project so it is
-releases at the same time.}
-
-\end{frame}
-
-\begin{frame}{MQTT Cloud Connectors}
-\protect\hypertarget{mqtt-cloud-connectors}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Cloud
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Amazon IoT
-  \item
-    Google Cloud IoT
-  \item
-    Microsoft Azure IoT
-  \item
-    CloudMQTT (at Heroku)
-  \end{itemize}
-\item
-  DIY
-
-  \begin{itemize}
-  \tightlist
-  \item
-    ThingMQ
-  \item
-    HiveMQ
-  \end{itemize}
-\end{itemize}
-
-\note{In between are:
-
-\begin{itemize}
-\tightlist
-\item
-  self hosted
-\item
-  Generic bridges
-\end{itemize}}
-
-\end{frame}
-
-\begin{frame}{MQTT - The protocol}
-\protect\hypertarget{mqtt---the-protocol}{}
-
-Agents have one of two roles:
-
-\begin{itemize}
-\tightlist
-\item
-  \emph{Client}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Publishes \emph{messages}
-  \item
-    Subscribes / unsubscribes to \emph{topics}
-  \end{itemize}
-\item
-  \emph{Broker} (aka Server)
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Handles network connections
-  \item
-    Keeps subscriptions
-  \item
-    Manages client
-
-    \begin{itemize}
-    \tightlist
-    \item
-      Disconnects
-    \item
-      \emph{(last) will}
-    \end{itemize}
-  \item
-    Persistence of retained messages
-  \end{itemize}
-\end{itemize}
-
-\note{network connections: this includes removing closed sockets,
-client’s that doesn’t respons to timeouts and duplicate clients.
-
-http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html
-
-Subscriptions are not permanent. The connection is (unlike HTTP)
-stateful.
-
-Some messages may be persistent, but only one per topic. You will often
-end up with a “proper” mq on the backend if queuing is needed.
-
-Push vs pull, central applications can push to clients}
-
-\end{frame}
-
-\begin{frame}{MQTT - The protocol - MQTT Packet}
-\protect\hypertarget{mqtt---the-protocol---mqtt-packet}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Size oriented
-\item
-  Flags indicate type of remaining bytes
-
-  \begin{itemize}
-  \tightlist
-  \item
-    Packet type
-  \item
-    Topic name
-  \item
-    Payload
-  \end{itemize}
-\end{itemize}
-
-\note{Only packet type + flags (1 byte) is required, everything else is
-optional.
-
-The size field is variable length encoded, 0-127 bytes is 1 byte,
-128-16383 use 2 bytes etc, up to 4 bytes for 256MB payload.}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT Connect}
-\protect\hypertarget{mqtt-connect}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{CONNECT}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{clientId}
-  \item
-    \texttt{username}
-  \item
-    \texttt{password}
-  \item
-    \texttt{keepAlive}
-  \end{itemize}
-\end{itemize}
-
-\begin{itemize}
-\tightlist
-\item
-  Keep alive
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{PINGREQ}
-  \item
-    \texttt{PINGRESP}
-  \end{itemize}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT - The protocol - MQTT Topic}
-\protect\hypertarget{mqtt---the-protocol---mqtt-topic}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Topic name: \texttt{foo/bar/baz}
-\item
-  Topic filter
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{foo/bar/?}
-  \item
-    \texttt{foo/\#}
-  \end{itemize}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT - The protocol - Retained message}
-\protect\hypertarget{mqtt---the-protocol---retained-message}{}
-
-Message is kept by the server even after disconnect
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{CONNECT}
-\item
-  \texttt{PUBLISH}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{RETAIN}
-  \item
-    \texttt{\$app/\$device/temperature}
-  \item
-    \texttt{22.3}
-  \end{itemize}
-\item
-  \texttt{DISCONNECT}
-\end{itemize}
-
-Later on:
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{SUBSCRIBE}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{\$app/\#/temperature}
-  \end{itemize}
-\item
-  \texttt{PUBLISH}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{\$app/\$device/temperature}
-  \item
-    \texttt{22.3}
-  \end{itemize}
-\end{itemize}
-
-\note{The last PUBLISH is an incoming message}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT - The protocol - Will message}
-\protect\hypertarget{mqtt---the-protocol---will-message}{}
-
-Message sent when you disconnect
-
-Client \#1:
-
-\begin{enumerate}
-[1.]
-\tightlist
-\item
-  \texttt{CONNECT}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{WILL\ TOPIC:\ \$app/\$device/online}
-  \item
-    \texttt{WILL\ PAYLOAD:\ 0}
-  \end{itemize}
-\item
-  \texttt{PUBLISH}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{\$app/\$device/online}
-  \item
-    \texttt{1}
-  \end{itemize}
-\item
-  \texttt{DISCONNECT}
-\end{enumerate}
-
-Broker
-
-\begin{enumerate}
-[1.]
-\tightlist
-\item
-  \emph{To all subscribers} \texttt{PUBLISH}
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{\$app/\$device/online}
-  \item
-    \texttt{0}
-  \end{itemize}
-\end{enumerate}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT Topic}
-\protect\hypertarget{mqtt-topic}{}
-
-The temperature sensor:
-
-\begin{itemize}
-\tightlist
-\item
-  Publishes on:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\$device-id/temperature}
-  \item
-    \texttt{myapp/\$device-id/humidity}
-  \item
-    \texttt{myapp/\$device-id/altert}
-  \end{itemize}
-\item
-  Subscribes to:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\$device-id/command}
-  \end{itemize}
-\end{itemize}
-
-The central application:
-
-\begin{itemize}
-\tightlist
-\item
-  Subscribes to:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\#/temperature}
-  \item
-    \texttt{myapp/\#/humidity}
-  \end{itemize}
-\item
-  Publishes on:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\$device-id/command}
-  \end{itemize}
-\end{itemize}
-
-\note{Typical first round of implementation.
-
-Commands can be: * load new firmware (maybe an URL and firmware
-signature). * Set new calibration values * Change reading interval,
-altert levels (autonomous operation)}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT on Arduino}
-\protect\hypertarget{mqtt-on-arduino}{}
-
-PubSubClient is our MQTT client implementation.
-
-\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}[fragile]{Assignment}
-\protect\hypertarget{assignment}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{mqtt}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}[fragile]{MQTT topic architecture}
-\protect\hypertarget{mqtt-topic-architecture}{}
-
-The central application is split:
-
-\begin{itemize}
-\tightlist
-\item
-  An aggregating agent:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\#/temperature}
-  \item
-    \texttt{myapp/\#/humidity}
-  \end{itemize}
-\item
-  Emailing agent
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\$device-id/altert}
-  \end{itemize}
-\item
-  Publishes on:
-
-  \begin{itemize}
-  \tightlist
-  \item
-    \texttt{myapp/\$device-id/command}
-  \end{itemize}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}{MQTT topic architecture}
-\protect\hypertarget{mqtt-topic-architecture-1}{}
-
-\begin{center}
-\begin{tikzpicture}
-
-\path
-    (-3 cm, 0) node (c1_label) {Device \#1}
-    ( 0 cm, 0) node (c2_label) {Device \#2}
-    ( 3 cm, 0) node (c3_label) {Device \#3}
-
-    (0, -3 cm) node (broker_label) {Broker}
-    (0, -6 cm) node (central_label) {Central}
-;
-
-\node (c1)[draw, circle, fit=(c1_label)] {};
-\node (c2)[draw, circle, fit=(c2_label)] {};
-\node (c3)[draw, circle, fit=(c3_label)] {};
-\node (broker)[draw, rectangle, thick, inner ysep=5 mm, inner xsep=10 mm, fit=(broker_label)] {};
-\node (central) at (central_label) [draw, circle, text width=2 cm] {};
-
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c1) to [bend right] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c2) -- (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c3) to [bend left] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (central) -- (broker);
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{MQTT topic architecture}
-\protect\hypertarget{mqtt-topic-architecture-2}{}
-
-\begin{center}
-\begin{tikzpicture}
-
-\path
-    (-3 cm, 0) node (c1_label) {Device \#1}
-    ( 0 cm, 0) node (c2_label) {Device \#2}
-    ( 3 cm, 0) node (c3_label) {Device \#3}
-
-    (0, -3 cm) node (broker_label) {Broker}
-
-    (-2 cm, -6 cm) node (agg_label) {Aggregator}
-    ( 2 cm, -6 cm) node (email_label) {Email}
-;
-
-\node (c1)[draw, circle, fit=(c1_label)] {};
-\node (c2)[draw, circle, fit=(c2_label)] {};
-\node (c3)[draw, circle, fit=(c3_label)] {};
-\node (broker)[draw, rectangle, thick, inner ysep=5 mm, inner xsep=10 mm, fit=(broker_label)] {};
-\node (agg) at (agg_label) [draw, circle, text width=2 cm] {};
-\node (email) at (email_label) [draw, circle, text width=2 cm] {};
-
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c1) to [bend right] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c2) -- (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (c3) to [bend left] (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (agg) -- (broker);
-\draw[{Latex[length=4mm, round]}-{Latex[length=4mm, round]}] (email) -- (broker);
-
-\end{tikzpicture}
-
-\end{center}
-
-\end{frame}
-
-\begin{frame}{MQTT - Patterns}
-\protect\hypertarget{mqtt---patterns}{}
-
-\begin{itemize}
-\tightlist
-\item
-  Combining MQTT and HTTP
-\item
-  Using web sockets transport
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}[fragile]{Assignment}
-\protect\hypertarget{assignment-1}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{mqtt2}
-\end{itemize}
-
-\end{frame}
-
-\begin{frame}[fragile]{Assignment}
-\protect\hypertarget{assignment-2}{}
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{mqtt3}
-\end{itemize}
-
-\note{discussion: how to connect these two devices?}
-
-\end{frame}
diff --git a/slides/what-is-iot-text.pdf b/slides/what-is-iot-text.pdf
deleted file mode 100644
index 68d20f7..0000000
--- a/slides/what-is-iot-text.pdf
+++ /dev/null