 member of the group will be selected to receive any given message asynchronously.</p>
<p>If no message is received by the given timeout (in milliseconds), the message handler is invoked with a <code>NULL</code> message.<br  />
 You can then destroy the subscription in the callback, or simply return, in which case, the message handler will fire again when a message is received or the subscription times-out again.</p>
<dl class="section note"><dt>Note</dt><dd>Receiving a message reset the timeout. Until all 