ThingML

The ThingML approach is composed of i) a modeling language, ii) a set of tools and iii) a methodology. The modeling language combines well-proven software modeling constructs for the design and implementation of distributed reactive systems:

• statecharts and components (aligned with the UML) communicating through asynchronous message passing
• an imperative platform-independent action language
• specific constructs targeted at IoT applications.

The ThingML language is supported by a set of tools, which include editors, transformations (e.g. export to UML) and an advanced multi-platform code generation framework, which support multiple target programming languages (C, Java, Javascript). The methodology documents the development processes and tools used by both the IoT service developers and the platform experts.

ThingML is distributed under the Apache 2.0 licence, and has been developed by @ffleurey and @brice-morin of the Networked Systems and Services department of SINTEF in Oslo, Norway, together with a vibrant open-source community. ThingML is now owned by Tellu, but remains open-source.

Issues, bug reports and feature requests should be submitted to the issue tracker on GitHub

Installing ThingML

This section should contain up to date information about getting the latest version of ThingML and getting started with it.

Versions and Distribution

The current recommended version of ThingML is version 2.X.X. Tagged versions are available on the Github release page:

• A standalone JAR which can be used from the command line: look for the most recent *.jar file on the releases page
• An eclipse update site to install the ThingML IDE in eclipse: look for the most revent *.zip on the releases page

Version 1.X.X is not maintained and should not be used (maintenance was stopped in Q3 2017). Version 2.X.X introduces a complete rewrite of the parser and editors based on XText. A few syntactical changes make the ThingML programs written for version 1 not compatible with version 2. There are also a few constructs which were evaluated in version 1 and were not re-implemented in version 2 (e.g. groups, streams, etc).

ThingML Command Line Compiler

The ThingML command line compiler is distributed as a standalone JAR. It requires Java 8 or newer. The latest version (*.jar) can be found on the releases pages

The command line tool contains all the code generators and plugins which are part of this repository.

Usage: java -jar ThingML2CLI.jar will provide usage information and a list of options.

ThingML Eclipse-Based IDE

1. Install "Eclipse IDE for Java and DSL Developers" from the Eclipse website.
2. Download the most recent update site (*.zip) from the releases pages.
3. Launch Eclipse
4. Install the ThingML plugins from the *.zip file: Help -> Install New Software... -> Add... -> Archive...

Usage: Once ThingML plugins are installed, *.thingml files will open with the ThingML editors. Right-click on *.thingml files and use HEADS / ThingML sub-menu to compile a ThingML file. Generated code will be put in a thingml-gen folder at the root of the eclipse project. Remember that only ThingML files containing a configuration can be compiled.

Docker-Based Distribution

Warning: Currently the image on Dockerub is not automatically updated. You should build the image from the Dockerfile to get an up-to-date version of ThingML.

If you have docker, you can use the build container with Eclipse and ThingML at the thingmleditor repository or the thingmleditor docker hub

Sample ThingML programs

The goal of this section is to give a list of example which should work out of the box

Note: over the years and versions, we have collected a lot of different samples and projects made with ThingML. However most of them are not maintained and updated to work with the latest version of ThingML. This might be confusing if you are getting started.

Examples which should be working out of the box:

• Basic Arduino examples: https://github.com/ffleurey/ThingMLArduinoDemo. The "1.Basics" folder contains a set of simple ThingML/Arduino programs dealing with digital IOs.

• Multi-platform Breakout game (Arduino, Posix C, Java and Javascript): https://github.com/ffleurey/ThingML-PongTutorial. This example demonstrate how to create platform independent components with ThingML.

• Arduino <-> Java communication (Serial): https://github.com/ffleurey/ThingML-PressureLogger. This program shows has to create 2 ThingML programs communicating over a serial port. One program is running on an Arduino and collects sensor measurement. The other is a running as a Java program collecting the measurement from the Arduino over the USB/Serial connection and displaying curves. This example is quite minimalistic but should be easy to customize for your own sensor/needs. It shows various features of ThingML like the Serial communication plugin and the possibility of adding Maven dependencies to your ThingML programs.

• Raspberry Pi GPIOs: https://github.com/ffleurey/ThingML-RPI-Blink A couple of very simple examples showing how to blink an LED on the Raspberry Pi using either C or NodeJS.

Example having known incompatibilities:

Note: Some old samples may be easy to fix but other may use features which have been removed from ThingML.

• Example from the org.thingml.samples in this repository. This folder contains many samples which were made with various versions of ThingML. It is good to explore to see different things that can be done with ThingML but it is not the place to get working samples when getting started.

• Tutorials from the HEADS project: https://github.com/HEADS-project/training/tree/master/1.ThingML_Basics. This tutorial is based on ThingML v1.0 which is no longer maintained.

Compiling ThingML Generated Code

The ThingML compiler generate platform specific source code in C, Java, Javascript or Go. This section give short guidelines on how the generated code should be complied and executed.

JAVA / Maven

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When compiling to Java, ThingML creates a complete Maven project which is ready to build with mvn clean install and execute with mvn exec:java.

Prerequisites:

• Make sure you have a proper JDK (a JRE is not sufficient)
• Install Maven

Using Eclipse:

Configure Eclipse so that it uses the JDK: Window -> Preferences -> Java -> Installed JREs (make sure it points to a JDK)

• Right click on pom.xml (in thingml-gen/java/your-configuration)
• Run as -> Maven build...
• In Goals type: clean install exec:java

If Maven claims it cannot find a pom.xml file, change the base directory in the Run as -> Maven build... window using the Workspace... button, so that it points to thingml-gen/java/your-configuration.

javascript for web browsers

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Nothing special. Open the generated index.html file in your System Browser (ideally Chrome or Firefox)

Do not use the default web browser embedded into Eclipse!

Javascript for Node.JS

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ThingML creates a standard Node.js package.

Prerequisites:

• NodeJS: Install Node.JS

Using Eclipse:

From this update site: Node.JS - http://www.nodeclipse.org/updates/enide-2015/, install Features included in Enide Studio .Features Set and Nodeclipse Node.js .Features Set 1.0.2.201509250223

• Right click on package.json (in thingml-gen/nodejs/your-configuration)
• Run as -> npm install
• Right click on main.js
• Run as -> Node Application

Visualize UML Diagrams (PlantUML)

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The files generated by the UML generator are text files which uses the PlantUML format. PlantUML will perform the layout and export the diagrams as images.

Prerequisites:

• Install Graphviz
• Install PlantUML (not needed if using the Eclipse plugin)

Using Eclipse:

Install PlantUML plugins in Eclipse using this update site: http://hallvard.github.io/plantuml/

• Window -> Show View -> Other... -> PlantUML

Make sure you have Graphviz installed. It is required by the Eclipse plugin. If you have issues getting PlantUML to work, follow the instructions from http://plantuml.com/eclipse

Posix C

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The generated code is a complete C project which include a Makefile.

• Open a terminal in the filder containing the generated code
• Compile with make
• Run with ./your-configuration

Prerequisites:

• Use a C-friendly OS (such as Linux)
• Install gcc and make + the libraries you are using.

Note: Virtual box is an option. Ubuntu on Windows 10 works fine as long as there are no graphics/hardware drivers involved.

Arduino C

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• Open the generated file in the Arduino IDE
• Compile
• Upload to your board

*Prerequisites: