Add initial content to he ESP8266 section

The brief description of ESP8266, along with the features
and two small figures were added to the Thesis.

glossaries.tex

@@ -62,7 +62,9 @@
 \newacronym{tcp}{TCP}{Transmission Control Protocol}
 \newacronym{tcpip}{TCP/IP}{\acrlong{tcp}/\acrlong{ip}}
 \newacronym{thd}{THD}{Total Harmonic Distortion}
-
+\newacronym{iot}{IoT}{Internet of Things}
+\newacronym{sdio}{SDIO}{Secure Digital Input Output}
+\newacronym{qfn}{QFN}{Quad Flat No-leads}
 
 \newglossaryentry{ethernet}{
 	name=ethernet,

problemexpres.tex

@@ -270,7 +270,7 @@ Wireless  & \gls {ieee}802.11n/g/b, \gls{ieee} 802.3, \gls{ieee} 802.3u \\
 
 
 
-\subsection{Atheros AR9331 wi-fi System-on-Chip}
+\subsection{Atheros AR9331 Wi-Fi System-on-Chip}
 The Atheros AR9331 is a highly integrated and cost effective \gls{ieee} 802.11n 1x1 2.4 G\gls{hz} \gls{soc} for \gls{wlan} \gls{ap} and \gls{router} platforms. The block diagram of the chip can be seen in figure \ref{f:ar_block}. Features of this \gls{soc} are following:
 
 \begin{itemize}
@@ -320,9 +320,37 @@ Whole printed circuit board of TL-WR703N was remade by the GL.inet team to expos
 
 
 \newpage
-\section{ESP8266 wi-fi node}
-since it is used, the whole section should be designated to provide some description about it
+\section{ESP8266 Wi-Fi module}
+The ESP8266 Wi-Fi module is a self contained \gls{soc} with integrated \gls{tcpip} protocol stack that can give any microcontroller access to your Wi-Fi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. The ESP8266 module is an extremely cost effective solution, with a huge code-base and community, making it a preferable option for many modern projects, mainly the ones that follow the \gls{iot} trend.
 
+\begin{figure}[ht!]
+\centering
+\includegraphics[width=.4\textwidth,angle=0]{esp-01}
+\caption{The first commercial iteration of the ESP8266 module, exposing two \glspl{gpio}}\label{f:esp-01}
+\end{figure}
+
+This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application specific devices through its \glspl{gpio} with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, including the front-end module, is designed to occupy minimal \gls{pcb} area. 
+
+\begin{figure}[ht!]
+\centering
+\includegraphics[width=.4\textwidth,angle=0]{esp-12e}
+\caption{The certified ESP8266 module exposing all \glspl{gpio}}\label{f:esp-12e}
+\end{figure}
+
+\subsection{Features of a ESP8266 chip}
+The list of features contained in a 24 pin plastic \gls{qfn} package are listed (but not limited to) in the following list:
+\begin{itemize}
+\item 802.11 b/g/n
+\item Wi-Fi Direct (P2P), soft-AP
+\item Integrated \gls{tcpip} protocol stack
+\item Integrated \gls{lna}, power amplifier, matching network and power management
+\item +19.5dBm output power in 802.11b mode
+\item Power down leakage current of <10uA
+\item 512kB - 4MB \Gls{flash} Memory (depending on manufacturer)
+\item Integrated low power 32-bit CPU could be used as application processor
+\item \gls{sdio} 1.1 / 2.0, \gls{spi}, \gls{uart}
+\item Standby power consumption of < 1.0mW
+\end{itemize}