 // Message buffer
 char buffer[161];
 char buffer2[201];
+
+static byte addr[8];
 
 // Destination number of the message
 char destination[] = "5511947459448";


#if WATER_TEMPERATURE_SENSOR
    // Add water temperature
    len = strlen(buffer);
    buffer[len] = ';';
    len++;
    sprintf(&buffer[len], "Tw:");
    len = strlen(buffer);
    sprintf(&buffer[len], "C=");
    len = strlen(buffer);
    dtostrf(wtemp, 1, 1, &buffer[len]);
#endif // WATER_TEMPERATURE_SENSOR

    // Created message

    // <YYYY-MM-DDTHH:MM:SS-03:00>;<type1>:<value1>:{unit1};...;<typeN>:<valueN>:{unitN}
    // Manually add 20 to the beginning of the buffer.
    buffer[0] = '2';
    //buffer[1] = '0';
    int len = strlen(buffer);
    // Convert the date received to ISO format.
    for (i = 0; i < len; i++) {
