Developing and Testing of Software for Wireless Sensor Networks - Networked Embedded Systems - page 290

TinyOS application TinyOS application TinyOS application

ADC Clock RFM ADC Clock RFM ADC Clock RFM

MICA mote hardware
platform

RENE mote hardware
platform

TOSSIM platform

Event queue

Component
gr aphs

Communication
services

ADC event APP

TEMP PHOTO AM

.........
.........

CRC
BYTE

ADC CLOCK RFM

TOSSIM
implementations

ADC
model

FIGURE . Comparison of TinyOS and TOSSIM system architecture.

of TOSSIM's communication services. It is a Java-based graphical user interface providing visual
feedback on the simulation state to control running simulations, for example, modifying ADC
readings and radio loss properties. A plug-in interface for TinyViz allows developers to implement
their own application-specific visualization and control code.
TOSSIM does not model radio propagation, power draw, or energy consumption. TOSSIM's is
limited by the interrupts that are timed by the event queue. They are nonpreemptive. In conclu-
sion, TOSSIM is an event-based simulation framework for TinyOS-based sensor networks. The
open-source framework and the communication services permit an easy adaptation or integration
of simulation models and the connection to application-specific simulation tools.

12.4.2 EmStar
EmStar is a software environment for developing and deploying applications for sensor networks
consisting of  bit embedded Microserver platforms [,]. EmStar consists of libraries, tools, and
services. Libraries implement primitives of interprocess communication. Tools support simulation,
emulation, and visualization of sensor network applications. Services provide network functionality,
sensing, and synchronization.