Re: [smartobjectdir] Charter

Fred Baker <> Sun, 09 October 2011 11:34 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 4A9FB21F8ABD for <>; Sun, 9 Oct 2011 04:34:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -99.999
X-Spam-Status: No, score=-99.999 tagged_above=-999 required=5 tests=[BAYES_50=0.001, USER_IN_WHITELIST=-100]
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id jpVz1KOzUS-g for <>; Sun, 9 Oct 2011 04:34:24 -0700 (PDT)
Received: from ( []) by (Postfix) with ESMTP id AF20821F8A97 for <>; Sun, 9 Oct 2011 04:34:24 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;;; l=2417; q=dns/txt; s=iport; t=1318160064; x=1319369664; h=subject:mime-version:from:in-reply-to:date:cc:message-id: references:to:content-transfer-encoding; bh=meHMhSlxeCKf4qZ63Ux6T5fikhj+LUWtATgEy3oHQnk=; b=GeG3mAkydLznjLnSJrblUDYo4h2r9mLI0bUFpi7xQAdRaPgo4Eq3ypgw x/gxdqDGAP2Aamc+Sdq5YwyhPQdXI7SlW7hOSxRcoTPU4j98Qx1m6C2tK F4Ey25XmKei+HKcfA0tWWKRmgcTmHmf3mIhIZjokQ6UnYi/GYoeK3jUhi 8=;
X-IronPort-AV: E=Sophos;i="4.68,511,1312156800"; d="scan'208";a="6781525"
Received: from ([]) by with ESMTP; 09 Oct 2011 11:34:24 +0000
Received: from Freds-Computer.local ( []) by (8.14.3/8.14.3) with ESMTP id p99BYAx1001832; Sun, 9 Oct 2011 11:34:24 GMT
Received: from [] by Freds-Computer.local (PGP Universal service); Sun, 09 Oct 2011 07:34:24 -0400
X-PGP-Universal: processed; by Freds-Computer.local on Sun, 09 Oct 2011 07:34:24 -0400
Mime-Version: 1.0 (Apple Message framework v1084)
From: Fred Baker <>
In-Reply-To: <>
Date: Sun, 9 Oct 2011 07:33:51 -0400
Message-Id: <>
References: <> <> <>
To: JP Vasseur <>
X-Mailer: Apple Mail (2.1084)
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: quoted-printable
Subject: Re: [smartobjectdir] Charter
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Sun, 09 Oct 2011 11:34:25 -0000

On Oct 9, 2011, at 5:27 AM, JP Vasseur wrote:

> There are other terms in us, 6lowpan (sometimes used to refer to IP smart object network, although it does point
> out to a specific set of technologies, LLN (Low power and Lossy Networks, …).

I'll argue that those refer to a specific category of such networks, one using IEEE 802.15.4; there are a number of other link layer technologies in use that don't necessarily have the same characteristics and for which 6lowpan isn't obviously relevant. I see tying it to a specific MAC/PHY as a trap. The important thing for us is that IP (of which 6lowpan is a compression) transcends the MAC/PHY in use and potentially connects it to networks composed of more traditional technologies such as IEEE 802.3.

> Thanks for updating the charter, I would just propose to replace "telemetry and control" by "sensing and actuating".

Willing enough, although I again see a potential trap. When we talk about industrial automation, management of water displays like the Bellagio Fountains, and so on, "actuating" is a great word in it primary meaning of "cause (a machine or device) to operate"; that goes straight back to Latin. That said, not every "action" in a network is the movement of a device; it also might change the thresholds in the sensor or do some other non-physical thing - that for which we might use the term "configuration". I talk about "control", because it includes both. Similarly, sensing to me is somewhat limited; the obvious meaning would be to somehow measure some physical thing like movement or temperature. In a building control system, it the actions might also include reporting state, such as "you announced that lamp X should change state to 'on'; lamp X is now 'on'". In space communications, the paradigm has been for some time "command and telemetry"; someone tells a satellite or space probe to do something, such as turn a camera in a specific direction, and the continuous stream of data from the satellite/probe might include the direction the camera is pointed. We observe, eventually, that the command has had a certain effect because we see the change in the telemetry it reports. Hence I use the terms "control" and "telemetry", as they include "sensing" and "actuating" but are not limited to their meanings.

Other opinions?