The use case of the constrained client with minimal local storage should be accommodated. However the use case important to Xerox is where the client must have the scanner deliver the scanned documents directly to the destination. (e.g., scanning a contract and delivering is securely to the destination.) The ability to discover scanners that support push without interrogating all the scanners in an enterprise environment is needed. We eliminated seven of the text records from the discovery message. This leaves 4 mandatory, 2 conditional, and 2 optional. Adding this one should not be an undue burden. I can live with a Boolean but would prefer a list of schemes. A list fully populated with the defined values would be "http,https,ftp,ftps,smb,ipp,ipps,mailto" which probably comes down to about 45 bytes for the text record.
Xerox Research Center Webster
Email: Peter.Zehler at Xerox.com<mailto:Peter.Zehler at Xerox.com>
Office: +1 (585) 265-8755
Mobile: +1 (585) 329-9508
FAX: +1 (585) 265-7441
US Mail: Peter Zehler
800 Phillips Rd.
Webster NY, 14580-9701
From: Ira McDonald [mailto:blueroofmusic at gmail.com]
Sent: Tuesday, February 11, 2014 10:55 AM
To: Michael Sweet; Ira McDonald
Cc: Zehler, Peter; IPP at pwg.org
Subject: Re: [IPP] IPP Scan - Is Push scanning mandatory?
The mobile client may have very limited local storage and therefore want
the MFD to push a large scan output file directly to a network server. That's
the use case for the boolean in the TXT record (at least I thought that was
what Smith and Pete were concerned about).
Ira McDonald (Musician / Software Architect)
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music / High North Inc
mailto: blueroofmusic at gmail.com<mailto:blueroofmusic at gmail.com>
Winter 579 Park Place Saline, MI 48176 734-944-0094
Summer PO Box 221 Grand Marais, MI 49839 906-494-2434
On Tue, Feb 11, 2014 at 10:13 AM, Michael Sweet <msweet at apple.com<mailto:msweet at apple.com>> wrote:
On Feb 10, 2014, at 5:31 PM, Ira McDonald <blueroofmusic at gmail.com<mailto:blueroofmusic at gmail.com>> wrote:
Hi Mike and Pete,
What about a simple TXT record discovery attribute for Push capability that's boolean?
Since a bunch of URI schemes are conditionally mandatory anyway, that gets 90% of
the discovery need.
What would be the use case?
It's one thing to need to find a color printer - you can't use software to print color on a B&W printers - but for scan if the MFD doesn't support push, the (mobile) client certainly *can* do it...
Michael Sweet, Senior Printing System Engineer, PWG Chair
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