n-zero, and the maxBufferedMessages field set as required - the default being 100.</p>
<p><a class="el" href="_m_q_t_t_async_8h.html#abc92f60743fc471643b473abbc987be0">MQTTAsync_getPendingTokens</a> can be called to return the ids of the messages waiting to be sent, or for which the sending process has not completed. </p>
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