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Gadgeteer Internet of Things API (Computer/Electronics Project)


This report outlines the problem statement, background study, existing as well as prospective solutions, software engineering practices that the team followed, important architectural decisions and some of the implementation challenges that our team faced during the course of this project.

Our team had comprehended the knowledge gained through this ‘MSc Software Engineering’ programme and followed the various aspects of software engineering discipline throughout the course of this project to build a high quality software product. We adhered to scrum project management and standard software engineering practices while working on this project.

Internet of Things:

“The Internet may already be huge, but it’s about to get a lot bigger.” (Intel Corporation

The internet has grown rapidly above all our expectations and has been evolving ever since it began as ARPANET in 1969 (Abbate  1994). Intel Corporation (2011) suggests that today internet has around 15 billion devices connected to it and estimates show that it is expected to have 31 billion devices by 2020. Internet of Things is a new evolution of the Internet  and underpinning its development is the ever increasing proliferation of networked ‘smart’ objects to the Internet.

Challenges of Internet of Things:

Although IOT promises new business models, and reduce cost and risk; a lot of technical challenges have to be solved in realising that dream.

Related Work and Existing Systems:

As it was discussed in the previous section, in order to understand the difficulties of IoT in real world scenarios, we studied some of the existing systems that provide IoT based services. We tried to learn from these systems and designed our system in such a way to complement the existing  systems  and also tried to address  some  of the outstanding issues  with these systems. For this purpose, we have chosen three different systems to discuss in this section, which provide different kind of IoT Services.


Project Initiation:

Project in itiation is the initial and an important step in a project’s lifecycle.
It was conducted during the sprint 0 to define the project’s vision and to study about
the project’s viability. This section discusses the different activities performed during
project initiation.

Project Stakeholders.

Project Stakeholders.

Hardware and Software developers are the main users of the system:

Hardware Developers: They use the Gadgeteer library to speed up their prototyping process  for  Gadgeteer platform. For other hardware platforms they can use the API directly to log data to the cloud.

Software  Developers: They use the API to retrieve the data generated from devices to create applications.

Requirements Elicitation:

General Requirements

  • An abstract API should be created which can work with devices from different hardware manufacturers
  • Users’ privacy of data should be considered.
  • The API should not only transmit raw data. But, it should perform some processing on the data
  • A lightweight Gadgeteer library should be created  to  help  the  hardware  developers with their implementation.
  • Provide data visualisation by using third-party libraries.
  • Provide a continuous stream of data by buffering the data locally when there is no internet connection.
  • Use Cases
  • Use Case  1: High  school  students  in  a  biology  class  logging  temperature
    and humidity.
  • Use Case 2: Specified by Dr Dean Mohamedally (using Gadgeteer)
  • Use Case 3: SDK Example use case of swapping to another prototyping platform (Engduino).


Architecture Overview:

Having done Advanced Analysis and Design as a core course in our master degree the team has developed a deep understanding regarding the importance and the benefits of having extensible and  robust software architecture.

Architecture and design decisions form  an important aspect of any product development since they affect the success and acceptance of the end product. In this section we describe the architecture of our solution and discuss some of the important architectural decisions that have been taken and the reasons for making those decisions in order to address the challenges.

Enterprise Architecture View.

Enterprise Architecture View.


Brief Description of Components:

In this section, we will discuss about the key components of our system. Since this project is split into different decoupled layers, it is necessary to focus on all of the layers and the components it consists of. The three important layers of this project include the website, web service and the Gadgeteer library.

Use Case Scenarios:

Common Walkthrough

Having briefly described the main components of the system in the above section, we would like to present a walkthrough of how these components are interacting with each other. To utilise the offered services, developers need to first login as valid users at the web site. Once logged in, at the device management page, developers can perform different actions such as addition, updating and deletion.

Walkthrough of the User Registration and Device Addition.

Walkthrough of the User Registration and Device Addition.

Software Measurement:

Because of our intention to develop software with high quality in terms of reusability and maintainability, along with implementation, we have been measuring the existing code to gain an insight into the current state of the project. Among various code metrics, according to the user guide (Microsoft Developer Network, 2012) focusing on the code metric tool embedded in VS 2012.

Testing Overview:


Every project should have a proper test strategy outlining about how and which artefacts will be tested along with test criteria and attributes. Since we followed Scrum project management methodology, all our testing efforts were aligned with values of agile manifesto. In Sprint 0, we laid out a master plan about how testing activities has to be carried out and the work flow to be followed.

White Box Testing:

Unit Testing

All path testing with k=1 has been used as the main approach to perform unit testing for data access layer.  As it was described by Schligloffm and Roggenbach (2007), this type of testing is a white box structural testing that aims to find all the possible executable pathswithin the code.

Integration Testing

Integration testing is usually done by combining individual modules; test cases are executed on the integrated  module. Although integration testing is generally black box, we have performed a white box testing to obtain code coverage.

Black Box Testing:

System and Functional Testing

It is obvious that our API could be invoked by any third-party application. Due to this fact, a functional  testing  which is  classified  as a black -box testing was the only option available to exercise our APIs in a third -party application. Our system, apart from the API also consists of a website   which contains  components  that  can be seen as  implementation of the a fore mentioned third -party  applications.  Therefore,  the  website  has  been tested  using automated tests through the user interface (UI) also known as Code d UI Tests by taking into consideration the acceptance criteria for all the user stories.


Having  in  mind  the  time  allocated  to  this  project,  undoubtedly  there  are  improvements  that can be considered in extending and enhancing its functionalities. As  an  immediate  work,  this  project will be  used  by  the  next  academic  year  students  under Dean  Mohamendally’s supervision.

In general, the idea is to create a hierarchy of hardware devices and manage them through the Gadgeteer API along with the implementation of some business use cases With  regards  to  long  term  improvements  we  have  considered ideas  such  as  including Machine  Learning  models  in  our  APIs to  enable  data  prediction and  creating libraries  for other  hardware  platforms  especially  for Arduino which  is  popular  and  more  mature. The  former  could  be  used  to  keep  the  models learning  about  the  gathered  data through  the  API .

By harnessing the knowledge gained from the models the device discovery  feature could be  enhanced by predicting the future data . The latter idea can speed up the development process for  other  platforms  as  the  Gadgeteer  library  does. By  doing  so,  it  adds  extra  value  to  the project and establishes Gadgeteer IoT API as a universal platform that can be integrated with any hardware device platform.


Gadgeteer Internet of Things API is the result of 3-month pains taking  work by  four  bright
software  engineers,  proved  to  be  useful  in  different  areas  such  as  education  and  safer neighbourhoods. Microsoft Research can publish it in their website and integrate it with their existing systems.

Within the time and budget constraint, the team has managed to meet all the requirements proposed by the stakeholders, achieve great client satisfaction and deliver a completely – working system which will be extended by the students from UCL in the following years . Every team member has fully participated in the development with great passion and equally contributed to the outcome of this project.

Given this opportunity, by strictly following the discipline of software engineering, team members have been able to critically assess and actually apply what they have learnt through the master programme, from development techniques to project management methodologies, from requirements engineering and advanced design to implementation and testing. Considering that the majority of the team had not implemented API – based systems in .NET, we have enhanced the skills and gained rich experience from this project. More importantly, we have the chances to attend workshops and access to cutting – edge technologies , such as Internet of Things, Windows Azure and MongoDB, which has considerably broadened our vision and kept us in pace with the current technology trends.

Source: Microsoft Research
Author: Pejman Aghili | Marios Constantinides | Sampath A Ramamuniappa | Zheng Gao
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