ajout app charac

2019-CloudCom.tex

@@ -260,6 +260,8 @@ application. While the derived model is more generic, we focus on a
 given application to obtain a precise use-case with accurate power
 consumption measurements.  
 
+\subsection{IoT device side}
+
 The Google Nest Thermostat relies on five sensors: temperature,
 humidity, near-field activity, far-field activity and ambient 
 light~\cite{Nest}. Periodical measurements, sent through wireless
@@ -284,6 +286,8 @@ home. We consider low-bandwidth applications where devices produces
 several network packets during each sensing period. The transmitting
 frequency can vary from one to several packet sent per minute~\cite{Cisco2019}. 
 
+
+\subsection{Cloud server side}
 We consider that the link between the AP and the Cloud is composed of
 several network switches and routers using Ethernet as shown in 
 Figure~\ref{fig:parts}. The number of routers on the path depends on the
@@ -303,6 +307,14 @@ same time.
   \label{fig:parts}
 \end{figure}
 
+The Cloud part of the application gathers the data sent by the IoT
+devices. These data are treated either on the fly (e.g. threshold
+detection) or periodically, and action commands are sent back to the
+device if required. For instance, if the user has set a targeted 
+temperature, the connected thermostat sends the measured
+temperature regularly, and once the target is reached, the Cloud server detects
+it, and sends back to the IoT device the command to pause the heater.
+
 In the following, we describe the experimental setup, the results and
 the derived end-to-end model. For all these steps, we decompose the overall
 IoT architecture into three parts: the IoT device part, the networking