add method
Implementation
void add(int idx) {
final p = malloc<PERIPHERAL_WEATHER_DATA>();
p.ref.month = month;
p.ref.day = day;
p.ref.type = type;
p.ref.temperature_low = temperature_low;
p.ref.temperature_high = temperature_high;
p.ref.aqi = aqi;
clingNative.cwsUpdateWeatherForecast(p, idx);
malloc.free(p);
clingNative.cwsSendWeather();
}