[zeromq-dev] use zeromq for pgm audio broadcast to android devices ?

Steven McCoy steven.mccoy at miru.hk
Wed Jan 2 19:58:09 CET 2013

On 2 January 2013 13:27, Dan Reardon <dtr29 at hotmail.com> wrote:

>  (a) Has anyone used PGM over WIFI to devices yet? Anyone tried it with
> hundreds or thousands of phones? (b) How well does it (or should it) work?

WiFi always has scalability issues, some intelligence is probably requiring
deploying to large scale across many access points.

> (c) If the wifi / electrical environment is dirty, will zeroMQ's queuing
> mechanisms get in my way?

Yes.  ZeroMQ is asynchronous, it's about dumping data as fast as possible
to the destination, for audio you want low-latency unreliable messaging
requiring no round trips.

> "guaranteed delivery", as this is a real time broadcast, missing audio
> segments should be substituted with silence when the cannot

Spotify handles this a little better with white noise.

There is an option of FEC to improve quality in lossy environments.

> Is there any chance that anyone would want to implement Uflood, Ucast or
> any other protocol specifically designed for wifi?

WiFi generally means completely random data-loss due to radio interference,
wired paths suffer more predictable data-loss and typically burst outages.

> We may be in a position to provide a testbed environment for large-scale
> wifi testing if someone else wants to develop the code! Who should we be
> talking to? Anyone interested in being the lead archtect or developer if we
> can support testing?

I actually have some hardware that may be suitable for such testing, 29
small devices with limited CPU and memory that can be networked via radio
or cable.

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