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+\chapter{Heartbeat}
+\label{chap:heartbeat}
+
+repeat introduction of heartbeat from chap:background, figure with focus on gameserver-masterserver interaction.
+
+\begin{figure}[h]
+  \centering
+  \includegraphics[width=\textwidth]{img/overview-hb}
+  \caption{Focus on interaction between gameserver and masterserver}\label{fig:overviewhb}
+\end{figure}
+
+explanation of purpose, UDP information which it contains and/or is meant to convey.
+\\
+security challenge (secure/validate)
+\\
+ports that are opened, listening\\
+\\
+
+\begin{figure}[H]
+  \centering
+  \includegraphics[width=\textwidth]{img/uplink-exchange}
+  \caption{Interaction between gameserver and masterserver}\label{fig:uplink}
+\end{figure}