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{{Short description|Distributed control system with particular focus on astronomical instrumentation}}
{{Infobox software
| name = INDI
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| released = {{Start date and age|2003|04|15|df=yes}}
| programming language = [[C (programming language)|C]], [[C++]]
| operating system = [[Linux]], [[
| platform =
| status = Active▼
| license = [[GNU Lesser General Public License|GNU LGPL v2.1+]]
| website = {{URL|https://www.indilib.org/}}
| latest release version = 1.8.9
| latest release date = {{Start date and age|2021|02|28|df=yes}}<ref>{{cite web
| url = https://github.com/indilib/indi/releases
| title = Releases · indilib/indi
| website = GitHub.com
| access-date = 2021-04-12
| archive-date = 2021-04-19
| archive-url = https://web.archive.org/web/20210419162720/https://github.com/indilib/indi/releases
}}</ref>
}}
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==Introduction==
[[Elwood Downey]] started the INDI Protocol initiative in 2003 to develop a platform and client independent control protocol. INDI is a simple protocol modeled on Extensible Markup Language ([[XML]]), described for interactive and automated remote control of diverse instruments. It is small, easy to parse, and stateless. In the INDI paradigm, each ''Device'' poses all command and status functions in terms of setting and getting ''Properties''. Each Property is a vector of one or more named members, and has a current value vector; a target value vector; provides information about how it should be sequenced with respect to other Properties to accomplish one coordinated unit of observation; and provides hints as to how it might be displayed for interactive manipulation in a [[graphical user interface]] (GUI). Clients learn the Properties of a particular Device at runtime using introspection.
This decouples Client and Device implementation histories. Devices have full authority over whether to accept commands from Clients. INDI accommodates intermediate servers, broadcasting, and connection topologies ranging from one-to-one on one type of system, to many-to-many between systems of different genre. The INDI protocol can be nested within other XML elements such as [[Remote Telescope Markup Language]] (RTML) to add constraints for automatic scheduling and execution.
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[[Image:indi server.png|frame|center|INDI Server Network Topology]]
==
The [[Internet Assigned Numbers Authority]] (IANA) has assigned
== See also ==
{{Portal|Free and open-source software|Astronomy}}
{{div col begin|colwidth=20em}}
*[[Space flight simulation game]]
**[[List of space flight simulation games]]
*[[Planetarium software]]
*[[List of observatory software]]
{{div col end}}
== References ==
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== External links ==
*[https://indilib.org/ INDI Library]
*[http://www.clearskyinstitute.com/INDI/INDI.pdf INDI Protocol white paper]
*[http://www.cloudmakers.eu/xindi xINDI (INDI based tools for OSX) project page]
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