I whipped up a script to do just this a little while ago. Shameless self plug for mqttjs!
https://gist.github.com/1832048 Am 08/06/2012 um 6:29 AM schrieb "Nicholas O'Leary" <[email protected]>: > Hi, > > I've done a very quick write-up of the presence technique: > http://mqtt.org/wiki/doku.php/presence > > Cheers, > Nick > > On 7 June 2012 09:02, [email protected] <[email protected]> wrote: >> ... incidentally, this kind of protocol-specific question would be worth >> asking in the MQTT Google >> Group https://groups.google.com/forum/?fromgroups#!forum/mqtt >> >> >> On Thu, Jun 7, 2012 at 9:01 AM, [email protected] >> <[email protected]> wrote: >>> >>> One way you could deal with presence would be to have an app publish a >>> persistent message to some kind of presence topic when it starts, and have a >>> LWT to publish a message and tell others that it had gone away. This is an >>> area that we need to flesh out on the wiki at some point >>> (http://mqtt.org/wiki/doku.php/techniques?s[]=presence) >>> >>> I think the only way you'd be able to do the second thing would be to have >>> a broker expose its internal counters, so that is bound to be >>> implementation-specific. I don't know of a broker that provides that kind of >>> information today. >>> >>> On Wed, Jun 6, 2012 at 7:49 PM, Jesús Iglesias <[email protected]> wrote: >>>> >>>> Hi guys! >>>> >>>> Is there any way to know if one client is conneted to the broker ata some >>>> time? >>>> >>>> One more, is there any way to know how many pending messages are for any >>>> innactive client with persistent connection? >>>> >>>> Thanks in advance, >>>> Jesus >>>> >>>> _______________________________________________ >>>> Mailing list: https://launchpad.net/~mqtt-users >>>> Post to : [email protected] >>>> Unsubscribe : https://launchpad.net/~mqtt-users >>>> More help : https://help.launchpad.net/ListHelp >>>> >>> >>> >>> >>> -- >>> Andy Piper | Farnborough, Hampshire (UK) >>> blog: http://andypiper.co.uk | skype: andypiperuk >>> twitter: @andypiper | images: http://www.flickr.com/photos/andypiper >> >> >> >> >> -- >> Andy Piper | Farnborough, Hampshire (UK) >> blog: http://andypiper.co.uk | skype: andypiperuk >> twitter: @andypiper | images: http://www.flickr.com/photos/andypiper >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~mqtt-users >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~mqtt-users >> More help : https://help.launchpad.net/ListHelp >> > > _______________________________________________ > Mailing list: https://launchpad.net/~mqtt-users > Post to : [email protected] > Unsubscribe : https://launchpad.net/~mqtt-users > More help : https://help.launchpad.net/ListHelp > _______________________________________________ Mailing list: https://launchpad.net/~mqtt-users Post to : [email protected] Unsubscribe : https://launchpad.net/~mqtt-users More help : https://help.launchpad.net/ListHelp
