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Generic library for creating simulated TANGO devices.

Project description

tango-simlib: Easily generate TANGO device simulators

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tango-simlib is a library that aids the data-driven development of TANGO device simulators. It aims to make it easy to develop basic simulators while making it possible to implement more complex simulators. In addition to the simulated device interface, a separate TANGO simulation-control interface is generated, allowing the simulator to be manipulated via a back-channel to simulate e.g. failure conditions on the simulated device interface.

Using only the basic TANGO interface description captured via a POGO generated XMI file, a basic simulator with randomly varying attributes and no-op command handlers can be generated with no further coding. Attribute simulation parameters and simple command behaviour can be specified using a Simulator Description Datafile (SimDD). The format of this file is currently a working proposal and subject to change. A more formal format specification is being worked on.

Note that tango-simlib does not generate simulator code. Rather, the simulator’s behaviour is driven by the description data at run-time using Python’s dynamic programming features. If the description files (XMI or SimDD) are modified, the simulator device server only needs to be restarted for the changes to take effect.

Basic Usage


Please Note

  • tango-simlib is compatible with Python2.7 and Python>=3.5.
  • Installation requires the TANGOBINARY prerequisites to be installed.
$ sudo apt-get install -y --no-install-recommends $(grep -vE "^\s*#" apt-build-requirements.txt | tr "\n" " ")

If you cannot install the PyTango package you will not be able to install tango-simlib. For more, documentation.

Installation from source, working directory where source is checked out

$ pythonX -m pip install . # Where 'x' is the version of Python

This package is available on PYPI, allowing

$ pip install tango-simlib


After installing tango_simlib, the tango-yaml script will be available to use

$ tango-yaml -h

usage: tango_yaml [-h] {xmi,fandango,tango_device,validate} ...

This program translates various file formats that describe Tango devices to
YAML. Or validates the conformance of a device against a specification.

positional arguments:
                        sub command help
    xmi                 Build YAML from a XMI file
    fandango            Build YAML from a fandango file
    tango_device        Build YAML from a running Tango device
    validate            Check conformance of a Tango device against a
                        specification in YAML format

optional arguments:
-h, --help            show this help message and exit


Check out the documentation for more information. Download Manual:


This project is licensed under the BSD 3-Clause License - see license for details.


Contributions are always welcome! Please ensure that you adhere to our coding standards CAM_Style_guide.



  • Flattened the dict structure generated by the fandango parser for the device attributes 132.
  • Configured all the default properties of the TANGO device’s attributes 133.


  • Updated DishMaster.yaml 126.
  • Pinned last known compatible Py2 version of pyrsistent 127.
  • Added ability to override min_update_period 128.
  • Added the ability to pass a custom logger to model 129.
  • Reduced logging verbosity 131.


  • Include enum labels in YAML spec document and sort labels 123.
  • Arranged the - name as the top value and have the keys sorted alphabetically 123.


  • Updated CHANGELOG in 122
  • Added validate option to tango-yaml tool in 121
    • This sub command enables conformance verification of a running Tango device against a specification file.


  • Updated CHANGELOG in 118
  • Added tango-yaml tool in 119
    • This tool translates fandango (fgo), XMI (xmi) or a running Tango device to YAML.
    • Once installed, run tango-yaml -h for details.


  • Added Weather.xmi to 117
  • Refactor the code base 116
  • Update compat function docstrings 115


  • Added Python2.7 and Python>=3.5 Compatibility Pull Request 110.
  • Formatted code with black
  • Added some missing XMI parser types Pull Request 101.


  • Support multiple device and control interfaces per server process (Enhancement)
    • Addressing issue raised in 56
  • Adding a log when writing to the attributes
  • Reduced the unnecessary logging of the TANGO device
  • Handle non scalar value
    • Linked to the Pull Request 91


  • Supporting more tango data types.
    • DevUChar
    • DevShort
    • DevUShort
    • DevLong64
    • DevULong64
    • DevState
    • DevEncoded
  • Updating documentation. Addresses issue 79.


  • Adding support to register and run a TANGO device using a file as a database.
  • Initialising the model quantity values with the default values specified in the simulator data description files.
  • Parsing simulator data description files in a pre-determined precendence order.
  • Removing unmaintained python-devicetest dependency.
  • Added a fandango json parser
    • This parser is used to process the TANGO device data file generated by the fandango library.
  • Making use of the PyTango v9.2.2 feature to create dynamic commands.


  • Force all unicode attributes in XMI files to byte strings.


  • Updates to the SimDD
    • Added a new type of behaviour in the side-effect actions suite for long-running commands.
  • Handle vector data type from pogo
  • Populate tango-db with device properties


  • Package release documentation
  • Updated console script names
    • tango-simlib-tango-launcher -> tango-simlib-launcher
    • tango-simlib-tango-simulator-generator -> tango-simlib-generator


  • DISH config files included in examples of device simulators
  • JSON Schema for SimDD configuration file validation


  • Modified the update method of the Model class to invoke the override pre-update and post-update method, respectively.


  • Handle DevEnum data type TANGO attributes
  • Handle Spectrum data format TANGO attributes

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