[Pharo-dev] UDP Broadcast message

jannik.laval jannik.laval at gmail.com
Thu Dec 19 10:39:34 EST 2013


And here is my small example code:

udpSocket := Socket newUDP.
udpSocket setOption: 'SO_BROADCAST' value: true.
udpSocket getOption: 'SO_BROADCAST'.
udpSocket receiveDataTimeout: 15.


Jannik

On Dec 19, 2013, at 4:29 PM, jannik.laval <jannik.laval at gmail.com> wrote:

> Ok, here is my situation:
> 
> - I have a Lego Mindstorm that broadcast a UDP message every 10 seconds.
> - With Wireshark I can see the UDP message, so no problem with that.
> - I tried to set the option SO_BROADCAST, it does not work anymore.
> 
> Any other idea ?
> 
> Jannik
> 
> On Dec 19, 2013, at 4:14 PM, Stephan Eggermont <stephan at stack.nl> wrote:
> 
>> Norbert wrote:
>> >To send or receive a broadcast packet you need to put special options on the socket on the native side (setsockopt). You need to >look if the SO_BROADCAST option is mentioned anywhere. If not it won’t work without adding them. And for sending them you >need almost special privileges on the system. This is not a „user feature“. 
>> 
>> And even though it is "the right thing" for lots of situations, your network is also very likely to not do the right thing
>> with broadcast packets. Etsy decided on using bittorrent protocol to update their production servers indexes, because they
>> found it too difficult to get their network to do the right thing. They found that their switches were basically livelocked
>> while dealing with broadcast packets. 
>> 
>> http://codeascraft.com/2012/01/23/solr-bittorrent-index-replication/
>> 
>> If you want the broadcast to travel a little further, the routers need to be configured not to drop the packets.
>> 
>> Stephan
> 

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