miner.php allow sending the muticast message multiple times

API-README

@@ -1247,6 +1247,28 @@ N.B. the accuracy of the timing used to wait for the replies is
 
 ---------
 
+Default:
+ $mcastretries = 0;
+
+Set $mcastretries to the number of times to retry the multicast
+
+If $mcastexpect is 0, this is simply the number of extra times
+that it will send the multicast request
+N.B. cgminer doesn't listen for multicast requests for 1000ms after
+each one it hears
+
+If $mcastexpect is > 0, it will stop looking for replies once it
+has found at least $mcastexpect rigs, but it only checks this rig
+limit each time it reaches the $mcasttimeout limit, thus it can find
+more than $mcastexpect rigs if more exist
+It will send the multicast message up to $mcastretries extra times or
+until it has found at least $mcastexpect rigs
+However, when using $mcastretries, it is possible for it to sometimes
+ignore some rigs on the network if $mcastexpect is less than the
+number of rigs on the network and some rigs are too slow to reply
+
+---------
+
 Default:
  $allowgen = false;
 

miner.php

@@ -3,7 +3,7 @@ session_start();
 #
 global $doctype, $title, $miner, $port, $readonly, $notify, $rigs;
 global $mcast, $mcastexpect, $mcastaddr, $mcastport, $mcastcode;
-global $mcastlistport, $mcasttimeout, $allowgen;
+global $mcastlistport, $mcasttimeout, $mcastretries, $allowgen;
 global $rigipsecurity, $rigtotals, $forcerigtotals;
 global $socksndtimeoutsec, $sockrcvtimeoutsec;
 global $checklastshare, $poolinputs, $hidefields;
@@ -70,6 +70,9 @@ $mcastlistport = 4027;
 # to wait for replies to the Multicast message
 $mcasttimeout = 1.5;
 #
+# Set $mcastretries to the number of times to retry the multicast
+$mcastretries = 0;
+#
 # Set $allowgen to true to allow customsummarypages to use 'gen' 
 # false means ignore any 'gen' options
 $allowgen = false;
@@ -375,8 +378,8 @@ $error = null;
 #
 function getrigs()
 {
- global $rigs, $mcastaddr, $mcastport, $mcastcode;
- global $mcastlistport, $mcasttimeout, $error;
+ global $rigs, $mcastexpect, $mcastaddr, $mcastport, $mcastcode;
+ global $mcastlistport, $mcasttimeout, $mcastretries, $error;
 
  $listname = "0.0.0.0";
 
@@ -414,6 +417,10 @@ function getrigs()
 	return;
  }
 
+ $retries = $mcastretries;
+ $doretry = ($retries > 0);
+ do
+ {
 	$mcast_soc = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
 	if ($mcast_soc === false || $mcast_soc == null)
 	{
@@ -464,6 +471,12 @@ function getrigs()
 
 		usleep(100000);
 	}
+
+	if ($mcastexpect > 0 && count($rigs) >= $mcastexpect)
+		$doretry = false;
+
+ } while ($doretry && --$retries > 0);
+
  socket_close($rep_soc);
 }
 #