File content as of revision 76:b07effe83fb8:

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

#define THRESHOLD_PERCENT_TEMP 0.02       // Percentage cut-off for avoiding sending similar temperature sensor data.
// Time interval for forcing a sending even if analog sensor readings are constantly similar (in seconds).
#define TIME_LIMIT_TEMP 900               

TemperatureMeasurement::TemperatureMeasurement(AbstractSmartRest& client, SmartRestTemplate& tpl, long& deviceId, LM75B& sensor, 
    DeviceIO& io, DeviceInfo& deviceInfo, DeviceBootstrap& bootstrap) :
    _client(client),
    _tpl(tpl),
    _deviceId(deviceId),
    _sensor(sensor),
    oldValue(0),
    _io(io),
    _deviceInfo(deviceInfo),
    _bootstrap(bootstrap)
{
    _init = false;
    sendingTimer.start();
}

bool TemperatureMeasurement::init()
{
    if (_init)
        return false;
    
    // Insert measurement
    // USAGE: 105,<DEVICE/ID>,<TEMPERATURE>
    if (!_tpl.add("10,105,POST,/measurement/measurements,application/vnd.com.nsn.cumulocity.measurement+json,application/vnd.com.nsn.cumulocity.measurement+json,%%,NOW UNSIGNED NUMBER,\"{\"\"time\"\":\"\"%%\"\",\"\"source\"\":{\"\"id\"\":\"\"%%\"\"},\"\"type\"\":\"\"c8y_TemperatureMeasurement\"\",\"\"c8y_TemperatureMeasurement\"\":{\"\"T\"\":{\"\"value\"\":%%,\"\"unit\"\":\"\"C\"\"}}}\"\r\n"))
        return false;

    _open = _sensor.open();
    _init = true;
    return true;
}

bool TemperatureMeasurement::run()
{
    if (!_open)
        return false;

    float data = 0;
    data = _sensor.temp();
    char tenant[25] = {0};
    const char* user= _bootstrap.username();
    int len = strchr(user, '/')-user+1+8;  // 8: length of "Tenant: ";
    len = len <= 25 ? len : 25;
    snprintf(tenant, len, "Tenant: %s", user);
    char signal[25] = {0};
    if (_deviceInfo.signalQuality())
        snprintf(signal, 25, "Network: %d dBm", _deviceInfo.signalQuality()->rssi);
    else
        strncpy(signal, "Network: ? dBm", 25);
    if (abs(oldValue-data) <= abs(oldValue)*THRESHOLD_PERCENT_TEMP) {
        if (sendingTimer.read() < TIME_LIMIT_TEMP) {
            _io.lcdPrint(tenant, signal);
            aDebug("Similar temperature readings found, no sending!\r\n");
            return true;
        } else {
            aDebug("Sending timer of temperature sensor timed out at %f s, a sending is forced.\r\n", sendingTimer.read());
        } 
    }

    char status[25] = {0};
    snprintf(status, 25, "Sending Temp %.1f", data);
    _io.lcdPrint(tenant, signal, status);
    ComposedRecord record;
    IntegerValue msgId(105);
    IntegerValue devId(_deviceId);
    FloatValue temperature(data, 1);
    if ((!record.add(msgId)) || (!record.add(devId)) || (!record.add(temperature)))
        return false;

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