alias.cpp File Reference

Example to demonstrate use of cosmos namespace aliases Follow this tutorial for more information tutorial-alias. More...

#include <iostream>
#include "agent/agent.h"
#include "jsonlib.h"

Include dependency graph for alias.cpp:

Functions
int	main ()
	Example to demonstrate use of cosmos namespace aliases by creating an alias to an equation that converts degrees Kelvin to degrees Celcius. More...

Variables
cosmosstruc *	cdata

Detailed Description

Example to demonstrate use of cosmos namespace aliases Follow this tutorial for more information tutorial-alias.

Function Documentation

int main

(

)

Example to demonstrate use of cosmos namespace aliases by creating an alias to an equation that converts degrees Kelvin to degrees Celcius.

define the node name (it must be installed in COSMOS/nodes

{
    cout << "Example for COSMOS Namespace Equations" << endl;

    string nodename = "cubesat1";

    // Establish the agent inside the given node
    if (!(cdata = agent_setup_client(NetworkType::UDP, nodename, 10000)))
    {
        cout << "agent_setup_client failed (error <" << AGENT_ERROR_JSON_CREATE << ">)"<<endl;
        exit (AGENT_ERROR_JSON_CREATE);
    } else {
        cout << "agent setup client ... OK" << endl;
    }

    // define the equation using the COSMOS namespace
    // in this case we are setting an equation to convert the temperature
    // for imu 0 (device_imu_temp_000) from Kelvin (the standart temperature unit in COSMOS)
    // to degree Celcius
    string equation = "(\"device_imu_temp_000\" - 273.15)";

    // get the equation handle for later use
    jsonhandle eqhandle;

    // map/connect the equation to the handle
    json_equation_map(equation,cdata,&eqhandle);

    // set initial IMU temperature in Kelvin
    cdata->devspec.imu[0]->gen.temp = 0;

    // loop to demonstrate how to change values on the cdata structure
    // and get the values from the equation and alias mechanisms

    while(cdata->devspec.imu[0]->gen.temp <= 300) {

        cout << "temperature value set [K]           : " << cdata->devspec.imu[0]->gen.temp << endl;

        // using the equation handle get the result of the equation
        double temp = json_equation(&eqhandle, cdata);
        cout << "temperature value from handle   [C] : " << temp << endl;

        // change temperature value for demo only
        // set temp in Kelvin
        cdata->devspec.imu[0]->gen.temp += 1;

        cout << endl;
    };

    return 0;

}

Variable Documentation

cosmosstruc* cdata