Example stream between a sensor node and a client, final tweaks

[skm-ma-ws1314.git] / sec-discussion.tex

diff --git a/sec-discussion.tex b/sec-discussion.tex
index 0f05d0c..2b26283 100644 (file)
--- a/sec-discussion.tex
+++ b/sec-discussion.tex
@@ -24,15 +24,6 @@ interested in specific values then only needs to communicate with a single node
 in the network.
 
 \paragraph{Sensor Data (XEP-0323)~\cite{xep0323}}
-%\begin{figure}
-  %\caption{Example stream between a sensor node and a client}
-  %\label{fig:streamexample}
-  %\begin{verbatim}
-%Client               Device
-%<stream>
-
-  %\end{verbatim}
-%\end{figure}
 This XEP specifies a way of reading out values from a
 sensor node. It allows to specify multiple data sources (e.~g. temperature,
 humidity) as well as multiple types of data (e.~g., momentary values, historical
@@ -43,6 +34,14 @@ accepts the request by returning a corresponding IQ stanza. If it has
 accepted the request, it reads out the requested data and returns it in a
 subsequent message stanza to the client.
 
+An example of this protocol can be seen in Figure~\ref{fig:examplexmpp}: after
+both clients have opened their streams, the client requests the momentary values
+for power and energy from the node named \emph{Device04}. The device first
+acknowledges this request, and, after retrieving the values, sends them back
+to the client.
+
+\input{fig-example-xmpp-stream.tex}
+
 \paragraph{Control (XEP-0325)~\cite{xep0325}} In this document, a way of
 controlling sensor nodes is specified, which allows a client to get and set
 control values on the node over message or IQ stanzas. As an example, in this
@@ -75,9 +74,6 @@ it is to be noted that this requires further implementation of compression
 algorithms as well as additional CPU and memory resources and thus might
 decrease message throughput and increase power consumption on embedded systems.
 
-
-\todo{example XML stream with sensor data}
-
 \subsection{Related Approaches}
 
 ``Chatty Things'' is not the only approach to implement communication in