[zeromq-dev] RFC: zbeacon for dhcp-style discovery

Michael Haberler mail17 at mah.priv.at
Wed Nov 27 14:20:03 CET 2013


Am 27.11.2013 um 14:15 schrieb Arnaud Loonstra <arnaud at sphaero.org>:

> On 11/27/2013 12:03 PM, Michael Haberler wrote:
>> I consider using zbeacon for service discovery, but more in a DHCP-style way (I dont have the use case for permanently visible beacons since the information is used during startup/on demand only)
>> 
>> an application looking for services would broadcast (a) request(s) for the services needed, and entities with matching services would reply with an answer directed to the source IP address (i.e. non-broadcast); repeat until all needed services acquired.
>> 
>> IMV the only missing part in zbeacon to achieve this would be a directed counterpart of zbeacon_publish(), with a signature like so:
>> 
>>  void zbeacon_send (zbeacon_t *self,  char *ipaddress, byte *transmit, size_t size)
>> 
>> which would transmit a directed UDP reply once.
>> 
>> --
>> 
>> If there's interest in such a feature I'd add support for this in czmq and issue a PR
>> 
>> - Michael
> 
> In Zyre zbeacon is broadcasting continuously, would the nodes be 
> replying continuously as well? Otherwise you would need to do some 
> tracking of nodes inside zbeacon?

I wouldnt use zbeacon_publish() so broadcasting wouldnt be used by the responder

zbeacon_send() would just pass a frame and ipaddress to the background thread for transmission

-Michael




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