M3-Weather: A Smart-M3 Forecast Widget for Mobile Users

M3-Weather client is a desktop widget on Nokia N900 device.

Widget

GPS module detects the current coordinates. Web service Geonames.org provides names of the nearest cities. Web service Weather.com provides weather forecast and other weather-related data. M3-Weather widget looks as shown in the following picture.
 
 

You can set IP address of SIB by editing field "Server IP". If new IP address is not valid, it is not saved and the message "Incorrect IP address" appears. After changing the IP address you can set default IP address of SIB by pressing button "Reset IP". Also client UUID can be edited in field "Client ID". You can restart connection with SIB or turn ON/OFF GPS by pressing appropriate buttons.

Architecture

The Smart-M3 architecture of M3-Weather as a distributed application is presented in the next picture. It consists of five KPs: KP-GUI, KP-GPScoords, KP-City, KP-Weather, and KP-coords. The latter KP does not participate in the basic use case, hence the KP is not presented in the scheme.
    

These agents run on user's mobile device:

• KP-GPScoords receives coordinates from GPS module and publishes them to SIB

• KP-GUI receives weather data and city names from SIB and displays then on the screen of device

These agents can run on dedicated servers if the device capacity is low:

• KP-City receives the current city name from the service and publishes it into SIB.

• KP-Weather receives current weather data form the server and publishes them into SIB.

A special KP called KP-Coords is mostly for testing. Instead of using GPS, user manually inputs arbitrary coordinates and the KP publishes them into SIB.

Installation instruction and other details are available in M3-Weather manual.

Ontology

Smart space content is structured with ontology. The M3-Weather ontology is shown below. There are three basic classes: Coords, City, and Weather.

Class Coords describes current position of the mobile device. The class has one property pos that is latitude and longitude. One individual of the class represents one device. Class City represents knowledge about a city. It has properties name, cityid, and processed. The former two are a conventional city name and a city ID on the weather service. The latter is an indicator of data actuality. Class Weather has data properties temp, icon, and caption to store the temperature, the number of preinstalled pictures of weather, and short description of weather, respectively.

The M3-Weather ontology is simple and can be easily extended. For example, such extension can describe 5-day weather forecast. Several personal smart spaces can be combined to provide weather data of one user to another.