2 Commits

  1. 18
      1-introduction.tex
  2. 4
      4-requirements.tex
  3. 910
      esper-ota.tex

18
1-introduction.tex

@ -1,21 +1,25 @@
\section{Introduction} \section{Introduction}
In todays marketplace, an explosive growth can be observed in the area of so-called smart devices, often referred to as Internet of Things (IoT).
On the one hand, conventional devices (i.e., door locks, light bulbs, washing machines) are extended with smart functions for remote control and monitoring.
At the same time, completely new categories of products evolve, such as the self-driving car.
To implement the additional smart functions, small embedded computer systems are getting integrated into the devices, allowing them to connect to the local WiFi network.
In embedded systems, the software, also known as firmware, is an essential part of the system. In embedded systems, the software, also known as firmware, is an essential part of the system.
On one side, it interacts with the hardware in a system specific way by implementing the specifications required by the components used in the system. On one side, it interacts with the hardware in a system specific way by implementing the specifications required by the components used in the system.
On the other side, it provides use-case dependent functionality in interaction with general purpose hardware components. On the other side, it provides use-case dependent functionality in interaction with general purpose hardware components.
Embedded systems are often thought as systems that never change their requirements or functionality. Embedded systems are often thought as systems that never change their requirements or functionality.
However, practical use shows that the environment in which these systems run do, in fact, change. However, practical use shows that the environment in which these systems run do, in fact, change.
These changes include, but are not limited to, modifications of to the expected behavior or additions to it, reconfiguration of parameters related to communication with other systems and the users as well as correcting errors that have been reported after deployment.
In almost all cases, the requirements can be accomplished by changing the firmware and do not need any modification of the hardware.
These changes include, but are not limited to, modifications to the expected behavior or additions to it, reconfiguration of parameters related to communication with other systems and the users as well as correcting errors that have been reported after deployment.
In almost all cases, the requirements can be accomplished by changing the firmware and do not need any modification to the hardware.
For updating the firmware on a system being deployed, the system must provide an interface for altering the firmware. For updating the firmware on a system being deployed, the system must provide an interface for altering the firmware.
In addition, such an interface should provide mechanisms to check which firmware is currently installed and which configuration parameters are used. In addition, such an interface should provide mechanisms to check which firmware is currently installed and which configuration parameters are used.
Even if systems are equipped with an interface for applying updates, the maintenance cost can still be enormous because administrators have to interact with each device physically.
For systems that are located in areas where reachability is limited the cost is increased even more.
Even if systems are equipped with an interface for applying updates, the maintenance cost can still be enormous if an administrator has to interact with each device physically.
For systems that are located in areas where reachability is limited the cost increases even more.
If a system is already able to communicate over a network interface, this can be leveraged to apply updates on these system - this is typically referred to as \textit{Over the Air (OTA)}. If a system is already able to communicate over a network interface, this can be leveraged to apply updates on these system - this is typically referred to as \textit{Over the Air (OTA)}.
By reusing the existing communication channels, the dedicated update interface can be omitted which leads to smaller packaging and reduces production cost. By reusing the existing communication channels, the dedicated update interface can be omitted which leads to smaller packaging and reduces production cost.
It also decreases the maintenance cost drastically because updates can be installed remotely.
It also decreases the maintenance cost drastically, because updates can be triggered remotely.
\textit{OTA} updates enables administrators to apply automation methods on the update process allowing to roll out updates in a controlled fashion. I.e. updates can be done on testing devices first, followed by security-critical deployments and subordinate ones can be delayed to times where the device is not utilized. \textit{OTA} updates enables administrators to apply automation methods on the update process allowing to roll out updates in a controlled fashion. I.e. updates can be done on testing devices first, followed by security-critical deployments and subordinate ones can be delayed to times where the device is not utilized.
Information about the update status provided by the devices allows administrators to apply monitoring techniques ensuring all updates are installed and devices ar in the desired state.
Information about the update status provided by the devices allows administrators to apply monitoring techniques ensuring all updates are installed and devices are in the desired state.

4
4-requirements.tex

@ -13,6 +13,10 @@ Even if the installation of an update fails in the middle of reprogramming the c
\item Downloading the updated firmware should be done over the WiFi interface using the same network connection as used during normal operation. \item Downloading the updated firmware should be done over the WiFi interface using the same network connection as used during normal operation.
Fetching the firmware should be done side-by-side with other traffic produced during operation. Fetching the firmware should be done side-by-side with other traffic produced during operation.
\item The update process can happen over any untrusted wireless network or Internet connection without being vulnerable to attackers.
To prevent possible attackers from injecting malicious software into the embedded devices, a cryptographic signature mechanism must be implemented.
New firmware only gets accepted by the device, if the cryptographic signature of the downloaded firmware image can be verified.
\item Reducing network load and aiming for the maximum possible device uptime is critical. \item Reducing network load and aiming for the maximum possible device uptime is critical.
Therefore, the update process should only be done if a new version is available. Therefore, the update process should only be done if a new version is available.
In contrast, the release of a new update should be rolled out to all devices as fast as possible. In contrast, the release of a new update should be rolled out to all devices as fast as possible.

910
esper-ota.tex

@ -1,350 +1,350 @@
%% bare_conf.tex
%% V1.3
%% 2007/01/11
%% by Michael Shell
%% See:
%% http://www.michaelshell.org/
%% for current contact information.
%%
%% This is a skeleton file demonstrating the use of IEEEtran.cls
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% well as large increases in file sizes.
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% (Unless specifically asked to do so by the journal or conference you plan
% to submit to, of course. )
%% bare_conf.tex
%% V1.3
%% 2007/01/11
%% by Michael Shell
%% See:
%% http://www.michaelshell.org/
%% for current contact information.
%%
%% This is a skeleton file demonstrating the use of IEEEtran.cls
%% (requires IEEEtran.cls version 1.7 or later) with an IEEE conference paper.
%%
%% Support sites:
%% http://www.michaelshell.org/tex/ieeetran/
%% http://www.ctan.org/tex-archive/macros/latex/contrib/IEEEtran/
%% and
%% http://www.ieee.org/
%%*************************************************************************
%% Legal Notice:
%% This code is offered as-is without any warranty either expressed or
%% implied; without even the implied warranty of MERCHANTABILITY or
%% FITNESS FOR A PARTICULAR PURPOSE!
%% User assumes all risk.
%% In no event shall IEEE or any contributor to this code be liable for
%% any damages or losses, including, but not limited to, incidental,
%% consequential, or any other damages, resulting from the use or misuse
%% of any information contained here.
%%
%% All comments are the opinions of their respective authors and are not
%% necessarily endorsed by the IEEE.
%%
%% This work is distributed under the LaTeX Project Public License (LPPL)
%% ( http://www.latex-project.org/ ) version 1.3, and may be freely used,
%% distributed and modified. A copy of the LPPL, version 1.3, is included
%% in the base LaTeX documentation of all distributions of LaTeX released
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%% Retain all contribution notices and credits.
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%% ** renaming them and changing author support contact information. **
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%% File list of work: IEEEtran.cls, IEEEtran_HOWTO.pdf, bare_adv.tex,
%% bare_conf.tex, bare_jrnl.tex, bare_jrnl_compsoc.tex
%%*************************************************************************
% *** Authors should verify (and, if needed, correct) their LaTeX system ***
% *** with the testflow diagnostic prior to trusting their LaTeX platform ***
% *** with production work. IEEE's font choices can trigger bugs that do ***
% *** not appear when using other class files. ***
% The testflow support page is at:
% http://www.michaelshell.org/tex/testflow/
% Note that the a4paper option is mainly intended so that authors in
% countries using A4 can easily print to A4 and see how their papers will
% look in print - the typesetting of the document will not typically be
% affected with changes in paper size (but the bottom and side margins will).
% Use the testflow package mentioned above to verify correct handling of
% both paper sizes by the user's LaTeX system.
%
% Also note that the "draftcls" or "draftclsnofoot", not "draft", option
% should be used if it is desired that the figures are to be displayed in
% draft mode.
%
\documentclass[10pt,conference,compsocconf]{IEEEtran}
%\documentclass[10pt]{IEEEtran}
\usepackage{times}
\usepackage{caption}
\captionsetup{font=footnotesize,justification=centering,labelsep=period}
% Add the compsoc option for Computer Society conferences.
%
% If IEEEtran.cls has not been installed into the LaTeX system files,
% manually specify the path to it like:
% \documentclass[conference]{../sty/IEEEtran}
\usepackage{multirow}
% Some very useful LaTeX packages include:
% (uncomment the ones you want to load)
% *** MISC UTILITY PACKAGES ***
%
%\usepackage{ifpdf}
% Heiko Oberdiek's ifpdf.sty is very useful if you need conditional
% compilation based on whether the output is pdf or dvi.
% usage:
% \ifpdf
% % pdf code
% \else
% % dvi code
% \fi
% The latest version of ifpdf.sty can be obtained from:
% http://www.ctan.org/tex-archive/macros/latex/contrib/oberdiek/
% Also, note that IEEEtran.cls V1.7 and later provides a builtin
% \ifCLASSINFOpdf conditional that works the same way.
% When switching from latex to pdflatex and vice-versa, the compiler may
% have to be run twice to clear warning/error messages.
% *** CITATION PACKAGES ***
%
%\usepackage{cite}
% cite.sty was written by Donald Arseneau
% V1.6 and later of IEEEtran pre-defines the format of the cite.sty package
% \cite{} output to follow that of IEEE. Loading the cite package will
% result in citation numbers being automatically sorted and properly
% "compressed/ranged". e.g., [1], [9], [2], [7], [5], [6] without using
% cite.sty will become [1], [2], [5]--[7], [9] using cite.sty. cite.sty's
% \cite will automatically add leading space, if needed. Use cite.sty's
% noadjust option (cite.sty V3.8 and later) if you want to turn this off.
% cite.sty is already installed on most LaTeX systems. Be sure and use
% version 4.0 (2003-05-27) and later if using hyperref.sty. cite.sty does
% not currently provide for hyperlinked citations.
% The latest version can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/cite/
% The documentation is contained in the cite.sty file itself.
% *** GRAPHICS RELATED PACKAGES ***
%
\ifCLASSINFOpdf
\usepackage[pdftex]{graphicx}
% declare the path(s) where your graphic files are
% \graphicspath{{../pdf/}{../jpeg/}}
% and their extensions so you won't have to specify these with
% every instance of \includegraphics
% \DeclareGraphicsExtensions{.pdf,.jpeg,.png}
\else
% or other class option (dvipsone, dvipdf, if not using dvips). graphicx
% will default to the driver specified in the system graphics.cfg if no
% driver is specified.
% \usepackage[dvips]{graphicx}
% declare the path(s) where your graphic files are
% \graphicspath{{../eps/}}
% and their extensions so you won't have to specify these with
% every instance of \includegraphics
% \DeclareGraphicsExtensions{.eps}
\fi
% graphicx was written by David Carlisle and Sebastian Rahtz. It is
% required if you want graphics, photos, etc. graphicx.sty is already
% installed on most LaTeX systems. The latest version and documentation can
% be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/required/graphics/
% Another good source of documentation is "Using Imported Graphics in
% LaTeX2e" by Keith Reckdahl which can be found as epslatex.ps or
% epslatex.pdf at: http://www.ctan.org/tex-archive/info/
%
% latex, and pdflatex in dvi mode, support graphics in encapsulated
% postscript (.eps) format. pdflatex in pdf mode supports graphics
% in .pdf, .jpeg, .png and .mps (metapost) formats. Users should ensure
% that all non-photo figures use a vector format (.eps, .pdf, .mps) and
% not a bitmapped formats (.jpeg, .png). IEEE frowns on bitmapped formats
% which can result in "jaggedy"/blurry rendering of lines and letters as
% well as large increases in file sizes.
%
% You can find documentation about the pdfTeX application at:
% http://www.tug.org/applications/pdftex
% *** MATH PACKAGES ***
%
%\usepackage[cmex10]{amsmath}
% A popular package from the American Mathematical Society that provides
% many useful and powerful commands for dealing with mathematics. If using
% it, be sure to load this package with the cmex10 option to ensure that
% only type 1 fonts will utilized at all point sizes. Without this option,
% it is possible that some math symbols, particularly those within
% footnotes, will be rendered in bitmap form which will result in a
% document that can not be IEEE Xplore compliant!
%
% Also, note that the amsmath package sets \interdisplaylinepenalty to 10000
% thus preventing page breaks from occurring within multiline equations. Use:
%\interdisplaylinepenalty=2500
% after loading amsmath to restore such page breaks as IEEEtran.cls normally
% does. amsmath.sty is already installed on most LaTeX systems. The latest
% version and documentation can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/required/amslatex/math/
% *** SPECIALIZED LIST PACKAGES ***
%
%\usepackage{algorithmic}
% algorithmic.sty was written by Peter Williams and Rogerio Brito.
% This package provides an algorithmic environment fo describing algorithms.
% You can use the algorithmic environment in-text or within a figure
% environment to provide for a floating algorithm. Do NOT use the algorithm
% floating environment provided by algorithm.sty (by the same authors) or
% algorithm2e.sty (by Christophe Fiorio) as IEEE does not use dedicated
% algorithm float types and packages that provide these will not provide
% correct IEEE style captions. The latest version and documentation of
% algorithmic.sty can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/algorithms/
% There is also a support site at:
% http://algorithms.berlios.de/index.html
% Also of interest may be the (relatively newer and more customizable)
% algorithmicx.sty package by Szasz Janos:
% http://www.ctan.org/tex-archive/macros/latex/contrib/algorithmicx/
% *** ALIGNMENT PACKAGES ***
%
%\usepackage{array}
% Frank Mittelbach's and David Carlisle's array.sty patches and improves
% the standard LaTeX2e array and tabular environments to provide better
% appearance and additional user controls. As the default LaTeX2e table
% generation code is lacking to the point of almost being broken with
% respect to the quality of the end results, all users are strongly
% advised to use an enhanced (at the very least that provided by array.sty)
% set of table tools. array.sty is already installed on most systems. The
% latest version and documentation can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/required/tools/
%\usepackage{mdwmath}
%\usepackage{mdwtab}
% Also highly recommended is Mark Wooding's extremely powerful MDW tools,
% especially mdwmath.sty and mdwtab.sty which are used to format equations
% and tables, respectively. The MDWtools set is already installed on most
% LaTeX systems. The lastest version and documentation is available at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/mdwtools/
% IEEEtran contains the IEEEeqnarray family of commands that can be used to
% generate multiline equations as well as matrices, tables, etc., of high
% quality.
%\usepackage{eqparbox}
% Also of notable interest is Scott Pakin's eqparbox package for creating
% (automatically sized) equal width boxes - aka "natural width parboxes".
% Available at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/eqparbox/
% *** SUBFIGURE PACKAGES ***
%\usepackage[tight,footnotesize]{subfigure}
% subfigure.sty was written by Steven Douglas Cochran. This package makes it
% easy to put subfigures in your figures. e.g., "Figure 1a and 1b". For IEEE
% work, it is a good idea to load it with the tight package option to reduce
% the amount of white space around the subfigures. subfigure.sty is already
% installed on most LaTeX systems. The latest version and documentation can
% be obtained at:
% http://www.ctan.org/tex-archive/obsolete/macros/latex/contrib/subfigure/
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%\usepackage[caption=false]{caption}
%\usepackage[font=footnotesize]{subfig}
% subfig.sty, also written by Steven Douglas Cochran, is the modern
% replacement for subfigure.sty. However, subfig.sty requires and
% automatically loads Axel Sommerfeldt's caption.sty which will override
% IEEEtran.cls handling of captions and this will result in nonIEEE style
% figure/table captions. To prevent this problem, be sure and preload
% caption.sty with its "caption=false" package option. This is will preserve
% IEEEtran.cls handing of captions. Version 1.3 (2005/06/28) and later
% (recommended due to many improvements over 1.2) of subfig.sty supports
% the caption=false option directly:
%\usepackage[caption=false,font=footnotesize]{subfig}
%
% The latest version and documentation can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/subfig/
% The latest version and documentation of caption.sty can be obtained at:
% http://www.ctan.org/tex-archive/macros/latex/contrib/caption/
% *** FLOAT PACKAGES ***
%
%\usepackage{fixltx2e}
% fixltx2e, the successor to the earlier fix2col.sty, was written by
% Frank Mittelbach and David Carlisle. This package corrects a few problems
% in the LaTeX2e kernel, the most notable of which is that in current
% LaTeX2e releases, the ordering of single and double column floats is not
% guaranteed to be preserved. Thus, an unpatched LaTeX2e can allow a
% single column figure to be placed prior to an earlier double column
% figure. The latest version and documentation can be found at:
% http://www.ctan.org/tex-archive/macros/latex/base/
%\usepackage{stfloats}
% stfloats.sty was written by Sigitas Tolusis. This package gives LaTeX2e
% the ability to do double column floats at the bottom of the page as well
% as the top. (e.g., "\begin{figure*}[!b]" is not normally possible in
% LaTeX2e). It also provides a command:
%\fnbelowfloat
% to enable the placement of footnotes below bottom floats (the standard
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% with other packages that modify the LaTeX2e float routines. The latest
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% IEEE should note that IEEE rarely uses double column equations and
% that authors should try to avoid such use. Do not be tempted to use the
% cuted.sty or midfloat.sty packages (also by Sigitas Tolusis) as IEEE does
% not format its papers in such ways.
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% *** Do not adjust lengths that control margins, column widths, etc. ***
% *** Do not use packages that alter fonts (such as pslatex). ***
% There should be no need to do such things with IEEEtran.cls V1.6 and later.
% (Unless specifically asked to do so by the journal or conference you plan
% to submit to, of course. )
\usepackage{listings} \usepackage{listings}
\usepackage{color} \usepackage{color}
@ -356,119 +356,123 @@
keepspaces=true, keepspaces=true,
breaklines=true, breaklines=true,
breakatwhitespace=true, breakatwhitespace=true,
}
% correct bad hyphenation here
\hyphenation{op-tical net-works semi-conduc-tor}
%\parskip 6pt plus 2pt minus 1pt
\parskip 3pt plus 2pt minus 1pt
\pagestyle{empty}
\begin{document}
\pagenumbering{gobble}
%
% paper title
% can use linebreaks \\ within to get better formatting as desired
}
% correct bad hyphenation here
\hyphenation{op-tical net-works semi-conduc-tor}
%\parskip 6pt plus 2pt minus 1pt
\parskip 3pt plus 2pt minus 1pt
\pagestyle{empty}
\begin{document}
\pagenumbering{gobble}
%
% paper title
% can use linebreaks \\ within to get better formatting as desired
\title{\textbf{\Large Implement Updates \textit{Over the Air} for \textit{ESP8266} microcontrollers}\\[0.2ex]} \title{\textbf{\Large Implement Updates \textit{Over the Air} for \textit{ESP8266} microcontrollers}\\[0.2ex]}
% \\[-1.5ex]
% author names and affiliations
% use a multiple column layout for up to three different
% affiliations
%\author{\IEEEauthorblockN{~\\[-0.4ex]\large Ngoc Khanh Truong\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt Ngoc.K.Truong@cs.hs-fulda.de}}
%\and
%\IEEEauthorblockN{~\\[-0.4ex]\large Christian Pape\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt christian.pape@cs.hs-fulda.de}}
%\and
%\IEEEauthorblockN{~\\[-0.4ex]\large Sebastian Rieger\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt sebastian.rieger@cs.hs-fulda.de}
%}}
% conference papers do not typically use \thanks and this command
% is locked out in conference mode. If really needed, such as for
% the acknowledgment of grants, issue a \IEEEoverridecommandlockouts
% after \documentclass
% for over three affiliations, or if they all won't fit within the width
% of the page, use this alternative format:
%
\author{\IEEEauthorblockN{Dustin Frisch\IEEEauthorrefmark{1},
%Christian Pape\IEEEauthorrefmark{2},
% \\[-1.5ex]
% author names and affiliations
% use a multiple column layout for up to three different
% affiliations
%\author{\IEEEauthorblockN{~\\[-0.4ex]\large Ngoc Khanh Truong\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt Ngoc.K.Truong@cs.hs-fulda.de}}
%\and
%\IEEEauthorblockN{~\\[-0.4ex]\large Christian Pape\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt christian.pape@cs.hs-fulda.de}}
%\and
%\IEEEauthorblockN{~\\[-0.4ex]\large Sebastian Rieger\\[0.3ex]\normalsize}
%\IEEEauthorblockA{Department of Applied Computer Science\\
%Fulda University of Applied Sciences\\
%Fulda, Germany\\
%Email: {\tt sebastian.rieger@cs.hs-fulda.de}
%}}
% conference papers do not typically use \thanks and this command
% is locked out in conference mode. If really needed, such as for
% the acknowledgment of grants, issue a \IEEEoverridecommandlockouts
% after \documentclass
% for over three affiliations, or if they all won't fit within the width
% of the page, use this alternative format:
%
\author{\IEEEauthorblockN{Dustin Frisch\IEEEauthorrefmark{1},
%Christian Pape\IEEEauthorrefmark{2},
%Sebastian Rieger\IEEEauthorrefmark{2} %Sebastian Rieger\IEEEauthorrefmark{2}
}
\IEEEauthorblockA{\IEEEauthorrefmark{1}Department of Applied Computer Science\\
Fulda University of Applied Sciences,
Fulda, Germany\\ Email: Dustin.Frisch@cs.hs-fulda.de}
%\IEEEauthorblockA{\IEEEauthorrefmark{2}Department of Applied Computer Science\\
%Fulda University of Applied Sciences,
}
\IEEEauthorblockA{\IEEEauthorrefmark{1}Department of Applied Computer Science\\
Fulda University of Applied Sciences,
Fulda, Germany\\ Email: Dustin.Frisch@cs.hs-fulda.de}
%\IEEEauthorblockA{\IEEEauthorrefmark{2}Department of Applied Computer Science\\
%Fulda University of Applied Sciences,
%Fulda, Germany\\ Email: \{christian.pape, sebastian.rieger\} @cs.hs-fulda.de} %Fulda, Germany\\ Email: \{christian.pape, sebastian.rieger\} @cs.hs-fulda.de}
}
% use for special paper notices
%\IEEEspecialpapernotice{(Invited Paper)}
% make the title area
\maketitle
\begin{abstract}
This article describes the implementation of durable and stable system for building firmware updates for embedded systems based on \textit{ESP8266}\cite{ESP8266} microcontrollers. This includes the mechanisms used to build the updates, distribute and install them on the device.
}
% use for special paper notices
%\IEEEspecialpapernotice{(Invited Paper)}
% make the title area
\maketitle
\begin{abstract}
Over the last years, a rapidly growing number of IoT devices is found on the market, especially in the area of the so-called smart home.
These devices, which are deployed in vast numbers and frequently in use over many years, pose a risk to the internet as a whole if not provided regularly with security patches.
Hence, a fully automated process for large-scale software updates of such embedded devices must be considered.
In this article, we present an implementation of a durable and stable system for building and publishing cryptographically secure firmware updates for embedded devices based on \textit{ESP8266} microcontrollers.
This includes mechanisms to build the updates from source and automatically sign, distribute and install them on the target devices.
\end{abstract} \end{abstract}
% IEEEtran.cls defaults to using nonbold math in the Abstract.
% This preserves the distinction between vectors and scalars. However,
% if the conference you are submitting to favors bold math in the abstract,
% then you can use LaTeX's standard command \boldmath at the very start
% of the abstract to achieve this. Many IEEE journals/conferences frown on
% math in the abstract anyway.
% no keywords
\begin{IEEEkeywords}
Anything; Something; Everything else.%
\end{IEEEkeywords}
% For peer review papers, you can put extra information on the cover
% page as needed:
% \ifCLASSOPTIONpeerreview
% \begin{center} \bfseries EDICS Category: 3-BBND \end{center}
% \fi
%
% For peerreview papers, this IEEEtran command inserts a page break and
% creates the second title. It will be ignored for other modes.
\IEEEpeerreviewmaketitle
% IEEEtran.cls defaults to using nonbold math in the Abstract.
% This preserves the distinction between vectors and scalars. However,
% if the conference you are submitting to favors bold math in the abstract,
% then you can use LaTeX's standard command \boldmath at the very start
% of the abstract to achieve this. Many IEEE journals/conferences frown on
% math in the abstract anyway.
% no keywords
\begin{IEEEkeywords}
Secure Updates, Over the Air, ESP8266.
\end{IEEEkeywords}
% For peer review papers, you can put extra information on the cover
% page as needed:
% \ifCLASSOPTIONpeerreview
% \begin{center} \bfseries EDICS Category: 3-BBND \end{center}
% \fi
%
% For peerreview papers, this IEEEtran command inserts a page break and
% creates the second title. It will be ignored for other modes.
\IEEEpeerreviewmaketitle
\input{1-introduction} \input{1-introduction}
\input{2-related-work} \input{2-related-work}
\input{3-environment} \input{3-environment}
\input{4-requirements} \input{4-requirements}
\input{5-implementation} \input{5-implementation}
\input{6-conclusion}
% ************************************
\bibliographystyle{IEEEtran}
\input{6-conclusion}
% ************************************
\bibliographystyle{IEEEtran}
\bibliography{esper-ota} \bibliography{esper-ota}
% that's all folks
\end{document}
% that's all folks
\end{document}
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