1. I. Introduction
The new wave of the embedded is
definitely the internet of things (IOT), the
basic idea of this concept is many of objects
(sensors, actuators, tags …) that can interact
and cooperate with each other, to reach a
specific purpose.
The Air Quality sensor Board (AQSB) is
a Mu-Electronics’ IoT secured solution. It is
able to measure the variation of gases that
impact the Air Quality in real time, provides
a Graphical User Interface (GUI) for
displaying and monitoring. When a sensor
detects an abnormal gas concentration, the
Mu-Electronics AQSB alerts the users by
displaying a warning in the GUI and sending
an e-mail.
The core of this Mu-Electronics prototype
can be saved to deal with others requested
applications in others fields.
II. AQSB Architecture
The AQSB Application manages two
types of sensors (air quality and temperature
sensors) with the possibility of adding others
types of sensors depending on user’s needs.
It transmits the measurements of the gas
concentration and the temperature in secured
mode to the server (that can be a PC or a
Smart Phone) using wireless area network
via TCP/IP protocol.
For the present prototype the WIFI has
been used to establish communications,
because it is the most common way used for
domestic applications. Although it offers
significant transfers debit and can be
replaced with other IoT communication
protocols such as LoRa, Sigfox etc.
Figure 1: AQSB Architecture
The AQSB application offers the possibility to
read from the flash memory (Non-volatile memory)
and write new values that are relative to the AQSB
device information (AQSB ID, Customer ID,
Location, Serial Number, Installation date and the
Validity date).
Figure 2: AQSB GUI
The AQSB Graphic User Interface (GUI) is
designed to satisfy user’s needs with an easy access,
understanding and use to facilitate actions. It offers to
the user the possibility to activate/deactivate any
connected AQSB, lists all connected device and

2. presents them with an icon that describes the
air quality level detected by every device.
The GUI gives measures evaluation through
time, it displays the detected warnings.
III. AQSB Security
For each communication between
connected objects, the data transfer over the
network must be extremely secured to
address other applications like Medical or
automotive ones. Thus, the security
constraint is seriously taken into
consideration during the implementation of
Mu-Electronics’ AQSB solution.
On our first prototype, the Advanced
Encryption Standard (AES) has been chosen
as cryptographic primitive because it
requires shorter keys, faster processing, and
low consumption but asymmetric algorithms
(3DES, RSA, ECC…) can be used
depending on clients’ demand.
The AQSB integrates a symmetric mutual
authentication that aims to prove both, the
identity of the AQSB by the server and the
identity of the server by the AQSB, in order
to establish a secured communication. Both
entities client/server need to communicate
securely preserving confidentiality, integrity
and authenticity. Therefore, a secure session
is opened after giving authenticity proof of
the two communication partners.
After a successful authentication, each
request and response during the secured
communication contains also the cyclic
redundancy check (CRC) to ensure the
integrity of data.
The scheme is summarized in the figure
bellow:
Figure 3: Authentication process
IV. Smart Configuration
The smart configuration is an easy way to
integrate the AQSB device into the network simply
by configuring the required information as the
Access Point SSID name, the security passcode when
WEP/WPA/WPA2 is enabled, the IP address for
server that well manages the data sent by AQSB
devices and the address mail that will receive the
email alert. It allows the user to configure the device
when it’s needed and this without updating the
firmware.
In this process a Wi-Fi enabled device
(smartphone, tablet or laptop) is used to send the
information to the AQSB device.
Figure 4: AQSB Smart configuration interface

3. V. Conclusion
The present AQSB application represents
a prototype that is used in the environment
domain with including air quality and
temperature sensors, but it can be used as
well for others domains such as medical,
home automation or industrial domain by
including other kinds of sensors.
Other types of communication than Wi-Fi
can be chosen like Sigfox and LoRa… Also
several ways of notifications in case of
warning can be used as SMS.