Hi both, Thanks for you fast answers. I had the same idea in mind, lower CPU Usage by removing that polling infinite loop and thus avoid useless broadcasts when nothing changes. The fact us that most of our users are using DS9490R adapters so it seems to be a no-go, this might have helped in getting domogik on very low end computers; I will stick to that infinite loop !
FWIW Domogik has a quite good onewire support and even more, feel free to join us #domogik @ freenode and give feedback ! On Fri, Jul 6, 2012 at 1:03 PM, Paul Alfille <paul.alfi...@gmail.com> wrote: > Patryk is right. The master initiates all communication (except perhaps for > a presence pulse when first connected). > > That means that polling has done at some stage of the system. > > You could have your program poll, or create a polling process and transmit > data from that. There are also some bus masters (the OWSERVER-ENET from EDS > comes to mind) that have polling incorporated with xml output. Since each > type of slave has unique properties and protocols, the polling routine has > to know the specific slave -- generally they are aware of the temperature > chips and some of the humidity sensors, depending on the target audience. > > The w1 kernel subsystem also can poll, again mostly temperature chips. > > OWFS is purely "pull" rather than "push" -- that was a design decision. It > allows nearly zero CPU consumption when not in use, and matches the 1-wire > actual architecture. It also allows a far broader support for the spectrum > of 1-wire slaves. > > More task-specific programs do have polling integrated. E.g. OWW (one-wire > weather). > > I don't know if this was insightful enough -- that's a stiff hurdle. > > By the way, your domogik project looks interesting, though relatively early. > Can you tell us your eventual vision? > > Paul Alfille > > > On Fri, Jul 6, 2012 at 6:41 AM, p4trykx <p4tr...@gmail.com> wrote: >> >> W dniu 06.07.2012 o 10:32 Romain Bourdy <rom...@bourdy.eu> pisze: >> >> > My question today is, is there any way to be notified of values >> > changes of a 1-wire sensor instead of polling at regular interval ? >> > Some of us use low resolution and would prefer a PUSH rather than PULL >> > approach in getting the values ( Think Message queuing / subscribe ). >> > Is there any way to achieve this with the actual OWFS ? Does hack >> > exists with the actual owfs python binding to workaround this ? >> >> If you mean that a sensor would send data when there is a change in temp >> or input state. It's not possible. Only 1-wire master can initiate >> communication. >> Lately there was discussion that some 1-wire/iButton slaves can do that >> but it's rather uncertain and limited to those few chips if it even works. >> So generally most popular DS18b20 has to be polled. >> >> >> >> >> >> >> -- >> Patryk >> >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. Discussions >> will include endpoint security, mobile security and the latest in malware >> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
