I was attempting to do my best to describe the difference based on the documentation. There are definitely some holes in my knowledge. I was hoping that someone else would add onto my description and add clarification since I was really limited by what was provided from the documentation.
I am also a little puzzled but going with the flow. George From: Gregg Reynolds [mailto:d...@mobileink.com] Sent: Friday, March 23, 2018 11:55 AM To: Nash, George <george.n...@intel.com> Cc: Joo-Chul Kevin Lee <cms.r...@gmail.com>; iotivity-dev <iotivity-dev@lists.iotivity.org> Subject: Re: [dev] difference between "Platform ID" and "PIID" ? On Thu, Mar 15, 2018, 5:14 PM Nash, George <george.n...@intel.com<mailto:george.n...@intel.com>> wrote: This is my attempt to describe the difference between piid and pi. (UUID is defined by RFC-4122) piid (Protocol Independent ID) - is intended as an identifier that is independent of the piid is required to be a UUID. Typo? Should be "as a device id that is independent of the protocol..."? Which implies that a protocol-dependent device ID is possible or at least allowed. If not, then since di is already a uuid, what is the point of a piid? Is this sloppy or far-sighted? Why would we want protocol-dependent dis? It is intended to detect if multiple instances of the same device has been discovered. One use case you have device `A` discovered by two different bridges. So your client it told by two different bridges that each bridge has a device. The client can look at the `piid` for the device from each bridge and it can conclude that both are the same device because they have the same `piid` even though the client is getting reports of the device twice over two different connections. The `piid` could be used to tell if you have discovered the same device over different protocols. For example TCP and Bluetooth. Why isn't the di uuid sufficient for that? Puzzled, Gregg
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