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

[Claudio Carbone]

My little experience with Wi-Fi and pgm: I'm sending an info message in broadcast from a pub socket so clients don't need to know the server address in advance.
Message is very simple: server ip and eventual known stations.

I've seen Wi-Fi routers drop packets at rates as low as 10Hz.
Some other routers got along up to 100Hz (most notably in this later category falls a Chinese TP-LINK of 6 years, while in the first category a Pirelli Netgate quite more modern!).

Admittedly I'm using very small messages, so your results may vary with the dimension, but if there are routers dropping packets at 10Hz and less than 100 bytes you know you're in for a lot of headache!

Regards
Claudio

-- Sent from my ParanoidAndroid Galaxy Nexus with K-9 Mail.

Pieter Hintjens <ph at imatix.com> wrote:

>On Thu, Jan 3, 2013 at 6:46 AM, Dan Reardon <dtr29 at hotmail.com> wrote:
>
>> Are you saying it runs on android but does not support wifi ? We
>would be
>> talking about the udp encapsulated pgm of course.
>
>Indeed, encapsulated pgm will run on Android and WiFi. My mistake.
>
>The low bit rate is inherent in the physics of WiFi. You can configure
>some WiFi routers to use higher bit rates for broadcast/multicast but
>the result will be a smaller network. You can boost the power of some
>routers.
>
>If you can find the scale where multicast works (at a certain number
>of devices the low bit rate is still faster than unicasting to each
>device), then you're not barking up the wrong tree any more.
>
>-Pieter
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