The extra header contains version: 0, payload: -1, ret: 0, flags: 0, size: 0, offset: 0 So the element described as size of data element is 0 though that described as length of payload data is -1.
Colin On 5 March 2017 at 19:34, Colin Law <clan...@gmail.com> wrote: > Can I just check there I not a confusion here, I am talking about comms > between client and owserver, not between server and sensor. > > On 5 Mar 2017 6:43 p.m., "Stefano Miccoli" <mo...@icloud.com> wrote: >> >> What you describe (0-size payload message followed by another valid >> message) cannot happen. >> May be what you really mean is a -1 size payload message? This is a “ping” >> which owserver sends every 1 second or so when it is still gathering data or >> under heavy payload. >> >> This is an aspect of the owserver protocol which easily gets unnoticed by >> implementers: please see https://github.com/miccoli/pyownet/pull/1 where >> Johan Ström corrected a similar bug in my pyownet. >> >> S. >> >> On 5 Mar 2017, at 17:51, Colin Law <clan...@gmail.com> wrote: >> >> I am trying to debug a problem on the node.js owserver client >> node-owfs and am looking for some clarification of the owserver >> protocol if possible please. >> >> Referring to [1] in response to a 1-wire read I expect to see a header >> with a payload of the size indicated in the header. Very often what I >> actually see is a header specifying a payload size of 0 followed by >> another header with the expected payload size and valid data. Is that >> normal or is there something strange going on? >> >> This is owserver 3.1p4-1 from the raspbian jessie testing repository >> on a pi zero. >> >> [1] http://owfs.org/index.php?page=owserver-protocol >> >> Colin >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >> >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
