[Pharo-dev] UDP Broadcast message

jannik.laval jannik.laval at gmail.com
Thu Dec 19 11:09:31 EST 2013


Ohhhhhh yessss !
Thank you, It works fine !

No more need of Wireshark.

Thank you again.
Jannik

On Dec 19, 2013, at 4:40 PM, Sven Van Caekenberghe <sven at stfx.eu> wrote:

> You also have to set a port with #setPort: no ?
> 
> On 19 Dec 2013, at 16:39, jannik.laval <jannik.laval at gmail.com> wrote:
> 
>> 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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