Multicast group join IGMP request not transmitted

[Druuka]

In sketch with and sACN library or in simple sketch with no added library Native Ethernet library does not transmit the required multicast subscription packet. If the multicast transmitter is link local the sketch will receive the packets but if not it will to see any packets. Adding another controller on the same switch which properly joins the multicast group "fixes" the problem.

Replacing Native Ethernet with QNEthernet library solves the issue but would prefer to use Native Ethernet library.

IPAddress multicastIP(239, 255, 0, 7); // Multicast IP address
unsigned int multicastPort = 5568; // Multicast port
// Begin UDP and join multicast group
if (Udp.beginMulticast(multicastIP, multicastPort)) {
Serial.println("Joined multicast group successfully.");
} else {
Serial.println("Failed to join multicast group.");
}