File content as of revision 90:423177e8a401:

#include "AnalogMeasurement.h"
#include "ComposedRecord.h"
#include "CharValue.h"
#include "IntegerValue.h"
#include "FloatValue.h"
#include "logging.h"

#define THRESHOLD_PERCENT_ANA 0.02       // Percentage cut-off for avoiding sending similar analog sensor data.
// Time interval for forcing a sending even if analog sensor readings are constantly similar (in seconds).
#define TIME_LIMIT_ANA 900               
    
AnalogIn _analog1(A0);
AnalogIn _analog2(A1);

AnalogMeasurement::AnalogMeasurement(AbstractSmartRest& client,
                                     SmartRestTemplate& tpl,
                                     long& deviceId,
                                     DeviceIO& io,
                                     DeviceInfo& deviceInfo,
                                     DisplayInfo& displayInfo) :
    _deviceId(deviceId),
    _tpl(tpl),
    _client(client),
    _io(io),
    _deviceInfo(deviceInfo),
    _displayInfo(displayInfo)
{
    _init = false;
    oldValues[0] = 0;
    oldValues[1] = 0;
    sendingTimer.start();
}

bool AnalogMeasurement::init()
{
    if (_init)
        return false;
    
    // Insert measurement
    // USAGE: 107,<DEVICE/ID>,<ANALOG1>,<ANALOG2>
    if (!_tpl.add("10,107,POST,/measurement/measurements,application/vnd.com.nsn.cumulocity.measurement+json,application/vnd.com.nsn.cumulocity.measurement+json,%%,NOW UNSIGNED NUMBER NUMBER,\"{\"\"time\"\":\"\"%%\"\",\"\"source\"\":{\"\"id\"\":\"\"%%\"\"},\"\"type\"\":\"\"c8y_AnalogMeasurement\"\",\"\"c8y_AnalogMeasurement\"\":{\"\"A1\"\":{\"\"value\"\":%%,\"\"unit\"\":\"\"A\"\"},\"\"A2\"\":{\"\"value\"\":%%,\"\"unit\"\":\"\"A\"\"}}}\"\r\n"))
        return false;

    _init = true;
    return true;
}

bool AnalogMeasurement::run()
{
    extern bool lastSensorReadingSent;
    float data[2] = {(float)_analog1*100, (float)_analog2*100};

    if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_ANA &&
        abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_ANA) {
        if (sendingTimer.read() < TIME_LIMIT_ANA) {
            if (lastSensorReadingSent) {
                _io.lcdPrint(_displayInfo.getFirstLine(), _displayInfo.getSecondLine());
                lastSensorReadingSent=false;
            }
            aDebug("Similar analog readings found, no sending!\r\n");
//            printf("[N] %f, %f\r\n", data[0], data[1]);
            return true;
        } else {
            aDebug("Analog sensor timed out at %f s, a sending is forced.\r\n", sendingTimer.read());
        }
    }

//    printf("[Y] %f, %f (%f, %f)\r\n", data[0], data[1], oldValues[0], oldValues[1]);
    char status[25] = {0};
    snprintf(status, 25, "Sending Poti %.1f,%.1f", data[0], data[1]);
    _io.lcdPrint(_displayInfo.getFirstLine(), _displayInfo.getSecondLine(), status);
    ComposedRecord record;
    IntegerValue msgId(107);
    IntegerValue devId(_deviceId);
    FloatValue analog1(data[0], 1);
    FloatValue analog2(data[1], 1);
    if ((!record.add(msgId)) || (!record.add(devId)) || (!record.add(analog1)) || (!record.add(analog2)))
        return false;

    float t_start = sendingTimer.read();
    if (_client.send(record) != SMARTREST_SUCCESS) {
        aWarning("Sending analog readings failed.");
        _client.stop();
        return false;
    }
    float t_end = sendingTimer.read();
    _client.stop();
    aInfo("Analog readings sent in %.1f.\r\n", t_end-t_start);
    oldValues[0] = data[0];
    oldValues[1] = data[1];
    sendingTimer.reset();
    lastSensorReadingSent=true;
    return true;
}