ottom">
<tr><th class="head">size</th>
<th class="head">name</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int64_t</td>
<td>connection_id</td>
<td>The connection id acquired from
establishing the connection.</td>
</tr>
<tr><td>int32_t</td>
<td>action</td>
<td>Action. in this case, 1 for announce.
See <a class="reference internal" href="#actions">actions</a>.</td>
</tr>
<tr><td>int32_t</td>
<td>transaction_id</td>
<td>Randomized by client.</td>
</tr>
<tr><td>int8_t[20]</t