File content as of revision 100:47ea098f8a47:

#include "AnalogMeasurement.h"
#include "ComposedRecord.h"
#include "CharValue.h"
#include "IntegerValue.h"
#include "FloatValue.h"
#include "LCDDisplay.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, DeviceInfo& deviceInfo) :
    _tpl(tpl),
    _client(client),
    _deviceInfo(deviceInfo)
{
    _init = false;
    oldValues[0] = 0;
    oldValues[1] = 0;
    t_start = time(NULL);
}

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()
{
    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) {
        time_t t_interval = time(NULL) - t_start;
        if (t_interval < TIME_LIMIT_ANA) {
            if (strcmp(LCDDisplay::inst().getThirdLine(), "")) {
                LCDDisplay::inst().setThirdLine("");
            }
//            printf("[N] %f, %f\r\n", data[0], data[1]);
            return true;
        } else {
            aDebug("Poti: Timeout at %d s.\n", t_interval);
        }
    }

//    printf("[Y] %f, %f (%f, %f)\r\n", data[0], data[1], oldValues[0], oldValues[1]);
    char status[27] = {0};
    snprintf(status, sizeof(status), "Send Poti %.1f,%.1f", data[0], data[1]);
    LCDDisplay::inst().setThirdLine(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;

    time_t t0 = time(NULL);
    if (_client.send(record) != SMARTREST_SUCCESS) {
        aWarning("Poti: Send failed.\n");
        _client.stop();
        return false;
    }
    time_t t1 = time(NULL);
    _client.stop();
    aDebug("Poti: Sent in %d s.\n", t1-t0);
    oldValues[0] = data[0];
    oldValues[1] = data[1];
    t_start = time(NULL);
    return true;
}