Function app::app_sensor::handle_sensor_data

extern "C" fn handle_sensor_data(
    sensor: sensor_ptr, 
    _arg: sensor_arg, 
    sensor_data: sensor_data_ptr, 
    sensor_type: sensor_type_t
) -> MynewtError

This listener function is called every 10 seconds by Mynewt to handle the polled sensor data. Return 0 if we have handled the sensor data successfully.