:util::Task_engine</code>, a/k/a boost.asio <code>io_context</code>, associated with <code>*peer_socket</code>), where <code>N == payload_blob.size()</code>. This indicates the entire buffer, and the handle, were sent successfully.</li>
<li><code>on_sent_or_error(E)</code>, where <code>bool(E) == true</code>, is executed similarly. This indicates the send did not fully succeed, and <code>E</code> specifies why this happened. No indication is given how many bytes were successfully sent (if any even were). (I