a></span>&gt;</span>?</span> <span class="parameter-name">transports</span>, </span></li>
<li><span class="parameter" id="-param-messageTTL"><span class="type-annotation"><a href="https://api.dart.dev/stable/3.5.3/dart-core/Duration-class.html">Duration</a></span> <span class="parameter-name">messageTTL</span> = <span class="default-value">const Duration(seconds: 3)</span>, </span></li>
<li><span class="parameter" id="-param-keepalivePeriod"><span class="type-annotation"><a href="https://api.dart.dev/stable