This project allows a user to generate files that simulate IOT devices with one or more sensors.
One of the issues with testing demoing, or building applications in the IOT space is the ability to have multiple devices and sensors. This application uses Gaussian random number generator to allow a user to generate CSV file(s) with numbers generated.
The application is a multi-threaded application using Java threads and Executor. The main application will start a thread for each device and in turn each device will create a thread for each sensor.
The Device has a queue that will continue to loop until the runtime is reached or it is Interrupted. Once it is interrupted it will flush the files and close them. Each pass of the loop will check a BlockingQuueu for any state messages from a sensor. If a message is received then the Map of sensor values is updated and a newline of data is sent to the CSV file for the device.
The Sensors will go to sleep for the emittime and when they wake up they will generate a new Gaussian randmo number, update its State and put a State message on the BlockingQueue.
The application can be build using the following command in the project directory:
mvn clean install
This command will create a target directory where you will find the following file:
iot-simulator-0.0.1-SNAPSHOT-jar-with-dependencies.jar
Launching the application is done in the target directory with the following command:
java -cp iot-simulator-0.0.1-SNAPSHOT-jar-with-dependencies.jar com.redhat.iot.simulator.Simulator classes/iotSimulator.json
The classes/iotSimulator.json is the path to the configuration file
The application is a simple command line application that has the ability to read a JSON config file to emulate devices. A sample file looks like:
{
"sensors" : [{
"id" : 0,
"mean" : 100.0,
"variance" : 5.0,
"emittime" : 1000
}, {
"id" : 1,
"mean" : 250.0,
"variance" : 25.0,
"emittime" : 1500
}
],
"devices" : 2,
"timeoffset" : false,
"name" : "Simulator",
"runtime" : 60000
}some key values: sensor mean: the mean value for the sensor to be simulated variance: the maximum change allowed between sensor readings emittime: rough time in milliseconds of when the sensor will create a new readings in milliseconds
devices: timeoffset: boolean value to determine if the CSV files will include an offset time runtime: how long the application will run to generate the file(s) in milliseconds
Apache License 2.0