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Networking-for-Arduino / EthernetENC

Ethernet library for ENC28J60. This is a modern version of the UIPEthernet library. EthernetENC library is compatible with all Arduino architectures with Arduino SPI library with transactions support. Only include EthernetENC.h instead of Ethernet.h
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Add support for sending multicast IP packets. #59

Open mlesniew opened 10 months ago

mlesniew commented 10 months ago

This commit extends the library to enable the transmission of multicast IP packets.

Multicast packets differ from unicast packets only in their destination IP address. The only missing part in the library to support multicast was the calculation of destination MAC addresses. Unlike unicast, there's no need for ARP protocol to find the destination MAC address; it can be derived directly from the destination IP address. This commit adds the missing code for that.

JAndrassy commented 10 months ago

the uIP documentation has

uIP supports broadcast packets as well as sending multicast packets

you want to add support for multicast with a change in uIP, but if sending multicast packets is not possible maybe the problem is in the Arduino wrapper part of this library.

uIP https://github.com/adamdunkels/uip