Add nonblocking mode to multicast for recv_from use

https://github.com/Hamlib/Hamlib/issues/695

src/network.c

@@ -1094,6 +1094,12 @@ int network_multicast_publisher_start(RIG *rig, const char *multicast_addr,
     }
 
     socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
+    u_long mode = 1; // Enable non-blocking mode
+#ifdef __MINGW32__
+    ioctlsocket(socket_fd, FIONBIO, &mode);
+#else
+    ioctl(socket_fd, FIONBIO, &mode);
+#endif
 
     if (socket_fd < 0)
     {

tests/rigctl_parse.c

@@ -270,6 +270,7 @@ declare_proto_rig(hamlib_version);
 declare_proto_rig(test);
 declare_proto_rig(cm108_get_bit);
 declare_proto_rig(cm108_set_bit);
+declare_proto_rig(set_conf);
 
 
 /*