When detaching a pipe, as well as checking the delay on connect sockopt is set,…

When detaching a pipe, as well as checking the delay on connect sockopt is set, also ensure that the protocol is not pgm or epgm as we are not implementing the functionality for multicase types

src/session_base.cpp

@@ -408,7 +408,8 @@ void zmq::session_base_t::detached ()
 
     //  For delayed connect situations, terminate the pipe
     //  and reestablish later on
-    if (pipe && options.delay_attach_on_connect == 1) {
+    if (pipe && options.delay_attach_on_connect == 1
+        && addr->protocol != "pgm" && addr->protocol != "epgm") {
         pipe->terminate (false);
         socket->terminated (pipe);
         pipe = NULL;