WoT-microcontroller-servient

WoT-microcontroller-servient is an implementation of W3C Web of Things Servient for embedded systems. This module allows users to: define W3C WoT Thing Descriptions, generate scripting files (sketches) in Embedded-C programming language executable by microcontrollers to expose Things, compile and flash these sketches.

How does it work?

This module provides a fully interactive CLI with which users can interact. The CLI has been developed using Python and Click library. Firstly, users can insert all the metadata included in W3C WoT Thing Descriptions and store them in a JSON file. Secondly, after receiving these metadata, the CLI parses and passes them to the Jinja2 template engine. Using this information and others provided by users, the template engine generates a scripting file including the Thing logic. This scripting file is executed by microcontrollers and it has the .ino extension. Finally, using this CLI, it is possibile to compile and flash the scripting file to a specific embedded system. The JSON and .ino files have the same name of the Thing inserted by users in TD and they are stored inside a folder with the same name too.

The only supported embedded system is NodeMCU.

Prerequisites

This package is only supported by Linux systems.

Linux

• Python v3.6.x
• pip Python package manager
• A proper C/C++ compiler toolchain, like GCC

Usage

Clone and install

Clone the repository:

git clone git@github.com:UniBO-PRISMLab/WoT-microcontroller-servient.git

Go into the repository:

cd WoT-microcontroller-servient

Install the package and all dependencies:

pip install .

It is recomended to install and use the package inside a virtual environment.

Commands

The application has four commands:

• start to begin the wizard to insert Thing Decription metadata
• build to insert information for template engine to generate Embedded-C scripting files
• compile to compile Embedded-C scripting files
• flash to flash Embedded-C scripting files into embedded systems

Start application

To start the CLI run:

embeddedWoTServient start

Implemented/supported features

Scripting API

• RESTful API ✔️

Protocol Support

• HTTP ✔️
• WebSocket ✔️

MediaType Support

• JSON ✔️

License

WoT-microcontroller-servient is released under the MIT License.