POPWin

• Author: Laurent Winkler
• Date: Decembre 2014

This document contains a general description of the POPWin project, specifications and examples of programmation.

Contacts

• EIFR
  • Pierre Kuonen [email protected]
  • Laurent Winkler [email protected]
  • Lu Yao [email protected]
• UNI GE
  • Pierre Leone [email protected]
  • Cristina Munoz Illescas [email protected]

System overview

POPWin provides a set of tools (based on POP-C++) to build communication between a remote machine and a network of sensors.

The complete system is devided into two parts:

• The high-level part handles the communication between different parallel objects that can run on different machines using the POP-C++ framework.
• The low-level part contains the sensor that communicate using radio waves.
• In between the two parts a Gateway sensor must be used. It will forward the messages between the SensorProxy object (running on a PC) and the rest of the sensor network. Communication between the SensorProxy and gateway sensor is done via USB.

Schema of the POPWin network

                                                                        ************
main -------------- POPSensor -- SensorProxy1 === GatewaySensor ***   *Sensor network*
                            \                                           ************  
                            |                                           
                            |
                            |                                                         
                            \                                           ************  
                             --- SensorProxy2 === GatewaySensor ***   *Sensor network*
                                                                        ************
                                     ...

--- TCPIP communication
=== USB communication
*** Radio communication

As explained in the documentation of the POPWin project the communication uses different messaging models:

• High level: the POP communication model (by TCP/IP)
• Low level: the publish/subscribe model is used (using the libraries of Contiki OS)

A more complete scheme of the network: POPWin architecture

Resource description and messaging system

To configure easily where to find sensors (described as resources) the application uses a resource file in JSON format. This file indicates how to connect to sensors and to which data the user wants to subscribe.

To set up communication between the different sensors of the low-level part and the nodes of the high-level parts of the system a messaging interface was developed. This interface allows to easily transcribe message from the publish-subscribe communication model used in the low-level system to the POP communication model used on the higher level.

Specifications of resource description and messaging can be found here.

Programming

The goal of the POPWin project is to provide an easy programming interface to the developer. This interface allows to acquire data from different sensor types in a transparent way.

The full programming guide for POPWin can be found here.

Quick start

To start the main example of POPWin:

1. Install POP-C++ on your computer (https://github.com/pop-team/pop-cpp)
2. Connect the gateway sensor to your computer via USB (Zolertia z1 in recommended)
3. Compile the files in directory gatewayMote/ and upload them to your gateway sensor
4. Compile and launch POPWin main application

	cd pop-win
	make
	popcrun objects.map ./main resources.json

For details on installation and troubleshooting please look at the development documentation.