Uninterruptible Power Supply (UPS) Management Protocol -- Commands and Responses
draft-rprice-ups-management-protocol-02

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IETF                                                       R. Price, Ed.
Internet-Draft                                 Network UPS Tools Project
Intended status: Informational                              6 March 2021
Expires: 7 September 2021

 Uninterruptible Power Supply (UPS) Management Protocol -- Commands and
                               Responses
                draft-rprice-ups-management-protocol-02

Abstract

   This text describes the command/response protocol currently used in
   the management of Uninterruptible Power Supply (UPS) units and other
   power devices often deployed in small offices, and in IT
   installations subject to an erratic public power supply.  The UPS
   units typically interface to an Attachment Daemon in the system they
   protect.  This daemon is in turn polled by a Management Daemon which
   notifies users and system administrators of power supply incidents,
   and takes system shutdown decisions.  The commands and responses
   described by this text are exchanged between the UPS Attachment
   Daemon and the Management Daemon.  Current practice leads to weak
   security and this is addressed in the Security and IANA
   Considerations.

Status of This Memo

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   This Internet-Draft will expire on 7 September 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Price                   Expires 7 September 2021                [Page 1]
Internet-Draft           UPS management protocol              March 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  How to read this text . . . . . . . . . . . . . . . . . .   4
     1.2.  Current practice  . . . . . . . . . . . . . . . . . . . .   4
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.4.  Comments  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Attachment Daemon . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Driver  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Event . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Instant Command . . . . . . . . . . . . . . . . . . . . .   5
     2.5.  Management Daemon . . . . . . . . . . . . . . . . . . . .   5
     2.6.  NUT (Network UPS Tools) Project . . . . . . . . . . . . .   6
     2.7.  Primary . . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.8.  Secondary . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.9.  Session . . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.10. UPS status  . . . . . . . . . . . . . . . . . . . . . . .   7
     2.11. UPS variable  . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Protocol overview . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Protocol specification  . . . . . . . . . . . . . . . . . . .   9
     4.1.  Notation used in this specification . . . . . . . . . . .   9
     4.2.  Commands  . . . . . . . . . . . . . . . . . . . . . . . .  10
       4.2.1.  "FSD" . . . . . . . . . . . . . . . . . . . . . . . .  10
       4.2.2.  "GET" . . . . . . . . . . . . . . . . . . . . . . . .  10
         4.2.2.1.  "CMDDESC" . . . . . . . . . . . . . . . . . . . .  10
         4.2.2.2.  "DESC"  . . . . . . . . . . . . . . . . . . . . .  11
         4.2.2.3.  "NUMLOGINS" . . . . . . . . . . . . . . . . . . .  11
         4.2.2.4.  "TYPE"  . . . . . . . . . . . . . . . . . . . . .  11
         4.2.2.5.  "UPSDESC" . . . . . . . . . . . . . . . . . . . .  12
         4.2.2.6.  "VAR" . . . . . . . . . . . . . . . . . . . . . .  13
       4.2.3.  "HELP"  . . . . . . . . . . . . . . . . . . . . . . .  13
       4.2.4.  "INSTCMD" . . . . . . . . . . . . . . . . . . . . . .  13