+\begin{table}[H]
+ \centering
+ \begin{subfigure}[t]{.48\textwidth}
+ \begin{tabular}{ll}
+ \toprule
+ \multicolumn{2}{c}{Request}\\
+ byte & value\\
+ \midrule
+ 1 & \texttt{'c'}\\
+ \midrule\midrule
+ \multicolumn{2}{c}{Response}\\
+ byte & value\\
+ \midrule
+ 1 & \texttt{'c'}\\
+ 2 & Peripheral bitmask\\
+ 3,4 & Bytes of memory\\
+ 5,6 & Size of the stack\\
+ 7 & Number of analog pins\\
+ 8 & Number of digital pins\\
+ \bottomrule
+ \end{tabular}
+ \caption{Send a device specification}
+ \end{subfigure}
+\end{table}