What is WattsApp?
WattsApp is a telemetry platform that demonstrates remote
monitoring of sensor readings using our state of the art
Contiki SNMP implementation.
It consists of a hardware interface to read
data from S0 metering interfaces that is connected
to an exporter running Contiki SNMP.
A data collector is collecting meter readings and interfacing to
a cloud server. The cloud server provides user authentication
via Facebook and interfaces with a web front end and an Android
application. All components of the Contiki SNMP
telemetry application communicate via IPv6.
WattsApp demonstrates that IPv6
is ready to build and deploy complete state of the art applications.
Tunneling solutions like Teredo allow everyone to
get easily connected to the IPv6 Internet and to
interface with WattsApp.
Motivation
Telemetry is an important function of the Internet of Things as it
is being developed and deployed today. Of particular interest are
energy monitors but also health monitors for elderly people or
even monitors for leisure activities such as sports monitors for
runners. Remote monitoring has been a prime application domain of
the SNMP protocol and there are currently activities
underway to standardize energy monitoring data models.
We provide the first production ready open source SNMP
stack for Contiki, a popular operating system for
constrained devices in IPv6/802.15.4 networks.
We have developed basic instrumentation to read network statistics,
to export information about the RPL routing protocol
and to export sensor readings using existing standardized models.
By using an SNMP stack, devices of the Internet of Things
easily integrate into existing monitoring solutions. Furthermore,
by using SNMP, new Internet of Things applications can
easily interface with existing hardware components (e.g., UPS devices
or smart power distribution units for data centers that come with
Ethernet interfaces and embedded SNMP agents).
WattsApp on Android
Don't have access to the computer? Not to worry! The WattsApp on Android application allows you to easily view your data directly from your Android phones. The data can be presented as a TreeMap or as a Time-Sequence Graph and is shown for the time period specified. The application also allows you to perform basic administrative tasks like renaming the meter or reseting its location. Moreover with our application you will be able to discover other meters in your neighborhood and request their owners to view their data. Keeping track of your energy, water, and everything else has never been so easy!
WattsCloud
The WattsCloud is written in PHP using the
Vanilla MVC Framework. It supplies the Web Interface
and the Android App with meter data through a RESTful
interface filtering it within the requested time frame. It is
responsible for managing user authorization which determines what
collectors and/or meters a Facebook authenticated user has
permissions to manage. The user account information and the
permissions associated to it are stored in a MySQL
database. The queries to rename or change the location of a meter
from either of the interfaces is also managed through the cloud.
The cloud in itself does
WattsPoll and WattsCollect
The collector is written in JavaScript
using the NodeJS framework. It supplies the Cloud
with meter data from an SQLite database.
Mutual authentication and encryption to the Cloud is done using
SSL client certificates. The Cloud queries the
collector using a RESTful API and returns data in
JSON format. It advertises its presence on the
network using mDNS. The poller reads the data from
the meters and stores the values together with timestamps in a
database shared with the collector. The poller is written in
Python since it needs to be easily adaptable to
different types of meters.
WattsBox
The WattsBox is used to measure the power consumption of various
electrical equipments using an S0 interface.
A custom designed circuit is connected to the S0
device that pulls the measurements and sends them to the
AVR Raven. The Raven converts pulses into equivalent kWh of
power consumed and transfers this information via IPv6
to the collector that queries for it using SNMP.
