doc: Rewrite introduction

The introduction was very limited so far but is important to manage
expectations regarding the device.

1 files changed, 34 insertions, 1 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index d1a7788..3d65a9e 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -22,7 +22,40 @@
 \chapter{Introduction}
 \label{chap:introduction}
 
-\texttt{soundbox} is a device to connect classic audio systems to the network.
+\texttt{soundbox} is a small Raspberry Pi based device with a micro USB power
+input and two cinch connectors as audio output. It can be used to connect
+classic audio systems to a WLAN network.
+
+Music or other audio content can be streamed to the \texttt{soundbox} device.
+Using multiple devices allows to build up a multi-room audio setup.
+
+\section{Current state}
+
+The following features are supported by the given \texttt{soundbox} version.
+
+\begin{itemize}
+	\item audio streaming with original sound quality
+	\item multi room audio without audible delay
+	\item 3D printed case to protect internals
+	\item discovery service to find the IP address of the device
+	\item safe shutdown by power cut
+\end{itemize}
+
+Nevertheless the usage of \texttt{soundbox} is restricted by the limitations
+below.
+
+\begin{itemize}
+	\item only the command line tool \texttt{ffmpeg} is currently supported to
+	      stream content to \texttt{soundbox} devices
+	\item no user friendly way to set the WLAN name (SSID) and password
+	\item network discovery requires the \texttt{lldpd} service for the Linux
+	      operating system or other client services for the Link Layer Discovery
+	      Protocol
+	\item no user friendly update mechanism
+\end{itemize}
+
+Improvements regarding these limitations are planned but future progress cannot
+be guaranteed.
 
 \chapter{User guide}