IMHO, one of the worst failings of WiFi is not including a UDP broadcast mode. This is sorely needed in many situations, such as viewing the Instructor¹s screen (or a presentation screen) in a classroom. How about a large lecture hall? A concert? A football stadium? WiFi is strictly a point-to-point connection. It needs point-to-multipoint capability.
-- Gordon Apple Ed4U Little Rock, AR On 7/10/17 1:19 PM, "Jens Alfke" <[email protected]> wrote: > >> On Jul 10, 2017, at 9:09 AM, David Hoerl <[email protected]> wrote: >> >> Can anyone suggest some open source project that supports say up to 25? > > I¹m interested in this too, so if you get any offline replies or find > something on your own, please report back here! > >> I did find https://github.com/jdiehl/async-network, but it appears its a >> datagram service only. Still, it might be made to work with a roll-your-own >> end to end protocol. > > Doing reliable messaging over UDP is tricky, but it can be done. There are a > number of protocols/libraries that provide that now, including WebRTC. > > I¹m guessing that AsyncNetwork broadcasts by sending to a UDP multicast > address. Now, back in the olden days (~2002-2004) Stuart Cheshire cautioned me > that sending too many multicast packets over WiFi would cripple network > performance, because the base station drops down to a very low-bandwidth mode > to ensure all the clients receive the packet. So it was actually faster to > send a separate unicast packet to each subscriber. I have no idea whether this > is still true. > > Jens
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