File content as of revision 71:063c45e99578:

#include "SignalQualityMeasurement.h"
#include "ComposedRecord.h"
#include "CharValue.h"
#include "IntegerValue.h"
#include "FloatValue.h"

#define THRESHOLD_PERCENT_SIG 0.05       // Percentage cut-off for avoiding sending similar signal sensor data.
#define TIME_LIMIT_SIG 900               // Time interval for forcing a sending even if signal sensor readings are constantly similar.

SignalQualityMeasurement::SignalQualityMeasurement(AbstractSmartRest& client, SmartRestTemplate& tpl, long& deviceId, DeviceInfo& deviceInfo) :
    _client(client),
    _tpl(tpl),
    _deviceId(deviceId),
    _deviceInfo(deviceInfo)
{
    _init = false;
    oldValues[0] = 0;
    oldValues[1] = 0;
    sendingTimer.start();    
}

bool SignalQualityMeasurement::init()
{
    if (_init)
        return false;
    
    // Insert measurement
    // USAGE: 104,<DEVICE/ID>,<RSSI>,<BER>
    if (!_tpl.add("10,104,POST,/measurement/measurements,application/vnd.com.nsn.cumulocity.measurement+json,application/vnd.com.nsn.cumulocity.measurement+json,%%,NOW UNSIGNED NUMBER UNSIGNED,\"{\"\"time\"\":\"\"%%\"\",\"\"source\"\":{\"\"id\"\":\"\"%%\"\"},\"\"type\"\":\"\"c8y_SignalStrength\"\",\"\"c8y_SignalStrength\"\":{\"\"rssi\"\":{\"\"value\"\":%%,\"\"unit\"\":\"\"dBm\"\"},\"\"ber\"\":{\"\"value\"\":%%,\"\"unit\"\":\"\"%\"\"}}}\"\r\n"))
        return false;

    _init = true;
    return true;
}

bool SignalQualityMeasurement::run()
{
    DeviceInfo::SignalQuality *signalQuality;
    
    if ((signalQuality = _deviceInfo.signalQuality()) == NULL)
        return false;
        
    float data[2] = {0, 0};
    data[0] = signalQuality->rssi;
    data[1] = signalQuality->ber;
    if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_SIG &&
        abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_SIG) {
        if (sendingTimer.read() < TIME_LIMIT_SIG) {
            printf("Similar signal readings found, no sending!\r\n");
            return true;
        } else {
            printf("Sending timer of signal sensor timed out at %f s, a sending is forced.\r\n", sendingTimer.read());
        } 
    }    
        
    ComposedRecord record;
    IntegerValue msgId(104);
    IntegerValue devId(_deviceId);
    IntegerValue rssi(signalQuality->rssi);
    IntegerValue ber(signalQuality->ber);
    if ((!record.add(msgId)) || (!record.add(devId)) || (!record.add(rssi)) || (!record.add(ber)))
        return false;

    if (_client.send(record) != SMARTREST_SUCCESS) {
        puts("Signal measurement failed.");
        _client.stop();
        return false;
    }
    
    _client.stop();
    oldValues[0] = data[0];
    oldValues[1] = data[1];
    sendingTimer.reset();
    printf("Signal quality measurement sent.\r\n");
    return true;
}