Multicast in node.js?

[Bry]

Hello guys,

anyone got an example of multicast udp in node.js? Ive been looking at the api but it really isn't documented very well. it doesn't have to be a full example, just a starting point to get my started.

[Ben Noordhuis]

https://github.com/joyent/node/blob/master/test/simple/test-dgram-multicast.js

The API is dirt simple really: enable/disable multicast,
enable/disable loopback, join/leave a multicast group - that's it.

[Bry]

Very nice. I'm still a newb at all this. You know the socket.io broadcast function that sends a message to all participants. is that multicast or is it just a loop through all clients calling the send function individually? Thanks.

[Ben Noordhuis]

The latter. IPv4 multicast doesn't work outside of local networks.

[Chris Dew]

You could have a look at this module which wraps multicast into a LAN-
wide event emitter:

https://github.com/chrisdew/multicast-eventemitter

All the best,

Chris.