Fix sending multicast packages if local address was specified

Change-Id: Ib2175964b00500bb579263af1863a1c72c5be1b9
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/knx/netip/qknxnetipserverdiscoveryagent.cpp b/src/knx/netip/qknxnetipserverdiscoveryagent.cpp
index 92df9f2..8fc5491 100644
--- a/src/knx/netip/qknxnetipserverdiscoveryagent.cpp
+++ b/src/knx/netip/qknxnetipserverdiscoveryagent.cpp
@@ -234,6 +234,9 @@ void QKnxNetIpServerDiscoveryAgentPrivate::setupSocket()
                     }
                 }
 
+                if (mni.isValid())
+                    socket->setMulticastInterface(mni);
+
                 if (socket->joinMulticastGroup(multicastAddress, mni)) {
                     usedPort = multicastPort;
                     usedAddress = multicastAddress;