></div><div class="top"><p class="src"><a name="v:checkIssue" class="def">checkIssue</a> ::  <a href="Network-Mom-Stompl-Patterns-Basic.html#t:SubA">SubA</a> i -&gt; Int -&gt; IO (Maybe (Message i))</p><div class="doc"><p>Check if data have been arrived for this subscriber;
   if data are available before the timeout expires,
   the function results in <code>Just</code> (<code>Message</code> i);
   if the timeout expires first, the result is <code>Nothing</code>.
</p><ul><li> <code><a href="Network-Mom-Stom