If you could share your paho code, people might know more, it's very hard to understand what you're doing I'm sorry.
What I _think_ is happening, is that while you are publishing with qos2, you might not have clean_session=False, or you might not have stable/persistent client ids. In that case, paho might reconnect, but it won't resubscribe. (If paho even reconnects) On Wed, Dec 11, 2013 at 10:10:49AM +0800, 灰(Grey)狼 wrote: > thanks . even though i pub a new message , my paho client also can't sub any > messages , so i think this problem has nothing with retained flag. > > > > > ------------------ Original ------------------ > From: "Jan-Piet Mens";<jpm...@gmail.com>; > Date: Tue, Dec 10, 2013 07:40 PM > To: "mosquitto-users"<mosquitto-users@lists.launchpad.net>; > > Subject: Re: [Mosquitto-users] 回复： I met a strange question > > > > Hello, > > > 1.delete mosquitto.db then restart mosquitto > > 2. pub a qos 2 message without sub > > 3. restart subscriber and cannot receive message any more. > > If you intend to be able to get messages previously published to the > broker (i.e. retained *by* the broker), you have to set the `retain' > flag on messages as you publish them. With the command-line tools, you'd > do something like this: > > mosquitto_pub -t topic -m payload -r > > A subsequent SUB on that topic (provided ACLs allow you to do so) will > read that last retained message for that particular topic. > > -JP > > -- > Mailing list: https://launchpad.net/~mosquitto-users > Post to : mosquitto-users@lists.launchpad.net > Unsubscribe : https://launchpad.net/~mosquitto-users > More help : https://help.launchpad.net/ListHelp > . > -- > Mailing list: https://launchpad.net/~mosquitto-users > Post to : mosquitto-users@lists.launchpad.net > Unsubscribe : https://launchpad.net/~mosquitto-users > More help : https://help.launchpad.net/ListHelp -- Mailing list: https://launchpad.net/~mosquitto-users Post to : mosquitto-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~mosquitto-users More help : https://help.launchpad.net/ListHelp
