[Ace] Fwd: Re: Feedback on building automation use case for ACE IETF
Ludwig Seitz <ludwig@sics.se> Thu, 11 September 2014 13:20 UTC
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Date: Thu, 11 Sep 2014 15:20:08 +0200
From: Ludwig Seitz <ludwig@sics.se>
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Subject: [Ace] Fwd: Re: Feedback on building automation use case for ACE IETF
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Hello, in Toronto Dave Robin promised us to provide feedback on building automation use cases from the perspective of the BACnet committee. FYI here is what he sent me: -------- Forwarded Message -------- Subject: Feedback on building automation use case for ACE IETF From: Dave Robin <drobin@automatedlogic.com> In Toronto, I mentioned that the BACnet committee had had a meeting in the past to analyze all uses of broadcast and multicast in the building automation industry. We came up with this list: ------ From the September 22, 2010 web conference and the IT-WG Summit (Sept 21-23, 2011) ----- - Initial bootstrap (DHCP, link-local) - Small deployments with no central name/discovery server (mDNS, link-local) - Change-of-Value reporting with many subscribers are more efficiently handled by multicast - Lighting: Group commands that must be executed quickly (e.g. "turn on the 5th floor lights") *- Reflashing/Updating: Large identical transfers to large numbers of recipients. ** Time sync * Sharing of widely-used data (outside air temperature, current electrical demand) * Device discovery/binding (Who-Is?) * Object discovery (Who-Has?) * Unsubscribed event notification ("For whomever might care... something bad happened") * Router announcement (I-Am-Router-To...) * Route discovery (Who-Is-Router-To...?) * Device announcement (I'm here... I'm still here <-- discouraged) * Private transfer (in use, but no *standard* uses) * Text message (in use, but no *standard* uses) ------------------------ The "reflashing" use case is the one that I was trying to remember in Toronto. I knew there was at least one other strong use case besides just lighting commands. From our experience, reflashing/patching/updating even a small wireless device, for example, is a brutal thing to do over constrained networks, taking thousands of times the normal operating bandwidth. Doing this to large groups of devices simultaneously is a tremendous time saver - comparing "an hour" to to "many days" for completion. But of course, this needs to be done securely! So it's would be a use case for ACE. Thanks, Dave -- Dave Robin Sr. Research Engineer Automated Logic | Building & Industrial Systems | United Technologies +1(770)795-4888
- [Ace] Fwd: Re: Feedback on building automation us… Ludwig Seitz