Ubuntu Manpage: dummy-ups - Driver for multi-purpose UPS emulation

Provided by: nut-server_2.7.4-11ubuntu4_amd64

NAME

       dummy-ups - Driver for multi-purpose UPS emulation

NOTE

       This man page only documents the specific features of the dummy-ups driver. For
       information about the core driver, see nutupsdrv(8).

DESCRIPTION

       This program is a multi-purpose UPS emulation tool. Its behavior depends on the running
       mode:

   Dummy Mode
       dummy-ups looks like a standard device driver to upsd(8) and allows one to change any
       value for testing purposes. It is both interactive, controllable through the upsrw(1) and
       upscmd(1) commands (or equivalent graphical tool), and batchable through script files. It
       can be configured, launched and used as any other real driver. This mode is mostly useful
       for development and testing purposes.

   Repeater Mode
       dummy-ups acts as a NUT client, simply forwarding data. This can be useful for supervision
       purposes. This can also allow some load sharing between several UPS instances, using a
       point-to-point communication with the UPS.

IMPLEMENTATION

The port specification depends on the running mode, and allows the driver to select the
right mode.

Dummy Mode
Port is a definition file name for dummy-ups. This can either be an absolute or a relative
path name. In the latter case the NUT sysconfig directory (ie /etc/nut,
/usr/local/ups/etc, ...) is prepended.

For instance:

[dummy]
driver = dummy-ups
port = evolution500.dev
desc = "dummy-ups in dummy mode"

This file is generally named "something.dev". It contains a list of all valid data and
associated values, and has the same format as an upsc(8) dump (<varname>: <value>). So you
can easily create definition files from an existing UPS using "upsc > file.dev". It can
also be empty, in which case only a basic set of data is available: device., driver.,
ups.mfr, ups.model, ups.status

Samples definition files are available in the "data" directory of the nut source tree, and
generally in the sysconfig directory of your system distribution.

Since dummy-ups will loop on reading this file, you can dynamically modify it to interact
with the driver. This will avoid message spam into your system log files, if you are using
NUT default configuration.

You can also use the "TIMER <seconds>" instruction to create scheduled events sequences.
For example, the following sequence will loop on switching ups.status between "OL", "OB"
and "OB LB" every minute:

ups.status: OL
TIMER 60
ups.status: OB
TIMER 60
ups.status: LB
TIMER 60

It is wise to end the script with a TIMER. Otherwise dummy-ups will directly go back to
the beginning of the file.

Repeater Mode
Port is the name of a remote UPS, using the NUT form, ie:

<upsname>@<hostname>[:<port>]

For instance:

[repeater]
driver = dummy-ups
port = ups@hostname
desc = "dummy-ups in repeater mode"

Unlike UPS specifications in the rest of NUT, the @hostname portion is not optional - it
is the @ character which enables Repeater Mode. To refer to an UPS on the same host as
dummy-ups, use port = upsname@localhost.

INTERACTION

       Once the driver is loaded in dummy mode, you can change any variables, except those of the
       driver.* and server.* collections. You can do this by either editing the definition file,
       or use the upsrw(1) and upscmd(1) commands.

       Note that in simulation mode, new variables can be added on the fly, by adding these to
       the definition file. Conversely, if you need to remove variable (such as transient ones,
       like ups.alarm), simply update these by setting an empty value. As a result, they will get
       removed from the data.

       In repeater mode, the driver acts according to the capabilities of the UPS, and so support
       the same instant commands and settable values.

BACKGROUND

       Dummy Mode was originally written in one evening to replace the previous dummycons testing
       driver, which was too limited, and required a terminal for interaction.

       dummy-ups is useful for NUT client development, and other testing purposes.

       It also helps the NUT Quality Assurance effort, by automating some tests on the NUT
       framework.

       It now offers a repeater mode. This will help in building the Meta UPS approach, which
       allows one to build a virtual device, composed of several other devices (either UPS,
       PDUs).

BUGS

       Instant commands are not yet supported in Dummy Mode, and data need name/value checking
       enforcement, as well as boundaries or enumeration definition.

AUTHOR

       Arnaud Quette