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https://github.com/thomasa88/pyets2_telemetry

Python plug-in support for SCS Telemetry SDK
https://github.com/thomasa88/pyets2_telemetry

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Python plug-in support for SCS Telemetry SDK

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README 

        
# pyets2_telemetry



*Python plug-in support for SCS Telemetry SDK*



## Introduction



pyets2_telemetry provides support for adding Python plug-ins to ETS2 ([Euro Truck Simulator 2](https://eurotrucksimulator2.com/)) by SCS Software. It consists of two parts: A native C++ ETS2 plug-in, that the game loads, and a Python framework, which is loaded by the native plug-in. The Python framework provides a plug-in API that is very similar to the ETS2 native API.



## Installation



> **NOTE**

>

> This plug-in provides support for plug-ins written in the [Python](https://www.python.org/) programming language. By itself, it does not provide any gaming functionalities. So after installing it, add a Python plug-in.

>

> E.g. [pyets2_telemetry_server](https://github.com/thomasa88/pyets2_telemetry_server) provides a telemetry server, compatible with [ETS2 Telemetry Web Server](https://github.com/Funbit/ets2-telemetry-server).



Download the latest release archive (`.tar.bz2`) from the [release page](https://github.com/thomasa88/pyets2_telemetry/releases) and unpack it in the ETS2 `plugins` directory (typically `"$HOME/.steam/steam/steamapps/common/Euro Truck Simulator 2/bin/linux_x64/plugins"`).



You can find the *plugins* directory in Steam, by right-clicking the game and selecting *Properties...* -> *LOCAL FILES* -> *BROWSE LOCAL FILES...* and then open the directories `bin/linux_64/plugins`. 



The unpacked file structure should look similar to this:



```

Euro Truck Simulator 2

└── bin

    └── linux_x64

        └── plugins

            ├── pyets2_telemetry_loader_1_0.so

            └── python

                └── pyets2lib

```



When you start the game, if the plug-in is detected, it will show a dialog about *Request to use advanced SDK features detected.*



## Compatibility



pyets2_telemetry has been tested with Euro Truck Simulator 2 version 1.35 on Ubuntu 18.04, with Python 3.6.



## Performance



Observations have not showed any visible decrease in FPS.



## Development



### Writing a Plug-in



For now, there are no example plug-ins. Refer to [pyets2_telemetry_server](https://github.com/thomasa88/pyets2_telemetry_server) for a (complex) example.



The Python API tries to mirror the SCS API. Refer to the documentation in the [Telemetry SDK](https://modding.scssoft.com/wiki/Documentation/Engine/SDK/Telemetry) for a description of the SCS API functionality and call flow, including descriptions of *channels* and *events*.



It is important that your plug-in handles being unloaded and reloaded.



#### API Functions



In essence, the following functions are used:



* `telemetry_init(version, params)` Called when the plug-in is loaded by ETS2

  * `params`members include:

    * `register_for_channel(channel, channel_cb, index, context)`

    * `register_for_event(event, event_cb, context)`

    * `common.logger` Provides a Python `logger` for the plug-in, which logs to the in-game console.

* `telemetry_shutdown()`Called when the plug-in is being unloaded. Make sure to stop any threads that you have started.



Notably, the following functions are currently missing, but should not be needed in most cases:



* `unregister_from_channel()`

* `unregister_from_event()`



Examine `python/pyets2lib/loader.py`, and possibly `loader.cpp`, for more information.



#### Constants and Helpers



* `pyets2lib.scsdefs` Provides definitions for channels and events.



* `pyets2lib.scshelpers` Contains helper functions.



#### Useful ETS2 Commands and Settings



##### Game Configuration



`"$HOME/.local/share/Euro Truck Simulator 2/config.cfg"`



* `uset g_developer "1"` Enable developer mode

* `uset g_console "1"` Enable in-game console

* `uset g_minicon "1"` Enable in-game mini console

* `uset g_fps "1"` Show FPS in mini console



##### Console Commands



* `sdk reload` Reload all plug-ins

* `sdk unload` Unload all plug-ins



##### Controls Configuration



If the console hotkey (`` ` ``) is not working, it can be remapped to another key by changing the controls configuration. To find out the name for the wanted key, assign it to a function in the game settings and inspect the resulting configuration.



`"$HOME/.local/share/Euro Truck Simulator 2/*profiles/*/controls_linux.sii"`



```

 "mix console `modifier(no_modifier, keyboard.grave?0)`"

```

### Loader Development



The loader is made up of two parts: The C++ native loader and the Python framework.



#### Native Loader



The native loader uses the [Python/C API](https://docs.python.org/3/c-api/) to load the Python framework. Source code is found in the `cpp` and `hpp` files. `loader.cpp` is the starting point.



Build the code using `make`. The `Makefile` expects to find `eurotrucks2_telemetry_sdk_1.10` in the top source directory.



The output library is called `pyets2_telemetry_loader.so`.



`test.cpp` is a very rudimentary test application, that loads the loader and makes some function calls into it. Build the `test` binary using `make test`.



#### Python Framework



Source code is found in the `python` directory. `loader.py` is the starting point.



#### Installation and Packaging



The following `make` targets handles installation and packaging:



* `install` Install pyets2_telemetry into the plugins directory.

* `install-dev` Install symlinks to pyets2_telemetry files into the plugins directory.

* `uninstall` Remove pyets2_telemetry files from the plugins directory.

* `package` Package pyets2_telemetry into `pyets2_telemetry_.tar.bz2` for distribution.



 All targets related to installation requires a `DESTDIR` variable, pointing to the ETS2 plugins directory. For example:



 ```

make DESTDIR="$HOME/.steam/steam/steamapps/common/Euro Truck Simulator 2/bin/linux_x64/plugins" install

 ```



## Future Improvements



The following points need improvement:



* Handling Python [daemon threads](https://docs.python.org/3/library/threading.html). Currently, the game sporadically crashes when unloading plug-ins with daemon threads.

* Kill left-over Python threads. A Python plug-in can hang the game when being unloaded (game exit, `sdk unload`) by not stopping all its threads.

* Support for unregistering from channels and events.

* Handle the user trying to use two copies of the library at the same time.

* Windows support.



## License



pyets2_telemetry is licensed under GPL 3.0. Refer to the file [LICENSE][LICENSE].



## SCS SDK License



pyets2_telemetry uses the *SCS Telemetry SDK*, which has the following license:



> SCS SDK

> Copyright (C) 2016 SCS Software

>

> Permission is hereby granted, free of charge, to any person obtaining a copy

> of this software and associated documentation files (the "Software"), to deal

> in the Software without restriction, including without limitation the rights

> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

> copies of the Software, and to permit persons to whom the Software is

> furnished to do so, subject to the following conditions:

>

> The above copyright notice and this permission notice shall be included in all

> copies or substantial portions of the Software.

>

> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

> SOFTWARE.