Loading parameters with WEB applications

[PA7T_Clemens]

Dear all,

I followed the tutorial:

http://redpitaya.readthedocs.io/en/late ... bApps.html

and made an application that stores parameters in a file via js/app.js:

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// sends configuration to backend
var local = {};
local['CALL'] = { value: $('#call').val() };
APP.ws.send(JSON.stringify({ parameters: local }));

This works great and now I would like to read the parameter back to the web app on application load.

To that end I call the method APP.processParamters(receive.parameters) every time a message is received.

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if (receive.parameters) {
    //console.log('received params')
    APP.processParameters(receive.parameters);
}

Interestingly, there are permanently parameters send by the cpp controller, which I did not configure.

The main.cpp looks like that:

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#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/sysinfo.h>

#include <sstream>

#include "main.h"

/* --------------------------------  OUT PARAMETERS  ------------------------------ */

CStringParameter call("CALL", CBaseParameter::RWSA, "", 10000);
CStringParameter grid("GRID", CBaseParameter::RWSA, "", 10000);
CStringParameter comment("COMMENT", CBaseParameter::RWSA, "", 10000);
CStringParameter wlid("WLID", CBaseParameter::RWSA, "", 10000);
CStringParameter wlpw("WLPW", CBaseParameter::RWSA, "", 10000);
/*
CFloatParameter ppm("PPM", CBaseParameter::RW, 0.0, 0, -100.0, 100.0);
CStringParameter wlid("WSPRLIVE-ID", CBaseParameter::RWSA, "", 10000);
CStringParameter wlpw("WSPRLIVE-PW", CBaseParameter::RWSA, "", 10000);
CStringParameter bands("BANDS", CBaseParameter::RWSA, "", 10000);
*/
const char *rp_app_desc(void)
{
    return (const char *)"Red Pitaya SDR WSPR 8-channel receiver.\n";
}


int rp_app_init(void)
{
    fprintf(stderr, "Loading sdr_wspr application\n");
//    CDataManager::GetInstance()->SetParamInterval(1000);
    system("/opt/redpitaya/www/apps/sdr_wspr/start.sh");
    return 0;
}


int rp_app_exit(void)
{
    fprintf(stderr, "Unloading sdr_wspr application\n");
    system("/opt/redpitaya/www/apps/sdr_wspr/stop.sh");
    return 0;
}

int rp_set_params(rp_app_params_t *p, int len)
{
    return 0;
}


int rp_get_params(rp_app_params_t **p)
{
    return 0;
}

int rp_get_signals(float ***s, int *sig_num, int *sig_len)
{
    return 0;
}

void UpdateSignals(void){}


void UpdateParams(void){
}


void OnNewParams(void) {
    call.Update();
    grid.Update();
    comment.Update();
    wlid.Update();
    wlpw.Update();

    std::stringstream wsprvars;
    wsprvars << "CALL=\"" << call.Value() << "\"" << '\n';
    wsprvars << "GRID=\"" << grid.Value() << "\"" << '\n';
    wsprvars << "COMMENT=\"" << comment.Value() << "\"" << '\n';
    wsprvars << "WLID=\"" << wlid.Value() << "\"" << '\n';
    wsprvars << "WLPW=\"" << wlpw.Value() << "\"" << '\n';

    system("mount -o rw,remount /opt/redpitaya");
    std::string command1 = "echo '" + wsprvars.str() + "' > /opt/redpitaya/www/apps/sdr_wspr/wspr-vars.sh";
    system(command1.c_str());
}

To my understanding there should only be a message with a parameter send, in case I call something like

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call.Value() = 'PA7T';

Do I misunderstand the concept of transferring parameters from the c++ controller for the js web app?