Examples: Update multicast sender and receiver examples for IPv6

It's the right thing to do, as we're in 2017, not 1997. Also, this takes
care to indicate that QAbstractSocket::MulticastTtlOption makes sense
mostly for IPv4, even though it's implemented for both families. In
IPv4, it's used to indicatae the scope, whereas in IPv6 it's stored in
bits 12-15 of the address.

Task-number: QTBUG-46046
Change-Id: I9741f017961b410c910dfffd14ffaabe0a2024d8
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/examples/network/multicastsender/sender.h b/examples/network/multicastsender/sender.h
index 5d8769790e..0af6f9aaec 100644
--- a/examples/network/multicastsender/sender.h
+++ b/examples/network/multicastsender/sender.h
@@ -70,9 +70,11 @@ private slots:
 private:
     QLabel *statusLabel = nullptr;
     QPushButton *startButton = nullptr;
-    QUdpSocket udpSocket;
+    QUdpSocket udpSocket4;
+    QUdpSocket udpSocket6;
     QTimer timer;
-    QHostAddress groupAddress;
+    QHostAddress groupAddress4;
+    QHostAddress groupAddress6;
     int messageNo = 1;
 };