Subscribing to a topic

lioneleeedadad · April 18, 2019, 6:31pm

topic [unknown type] how can I solve this issue ?

tumbili · April 19, 2019, 5:35am

PX4/Firmware/blob/master/src/modules/wind_estimator/wind_estimator_main.cpp#L119


	void		update_params();


	bool 		subscribe_topics();
};


work_s	WindEstimatorModule::_work = {};


WindEstimatorModule::WindEstimatorModule():
	ModuleParams(nullptr)
{
	_vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude));
	_vehicle_local_position_sub = orb_subscribe(ORB_ID(vehicle_local_position));
	_airspeed_sub = orb_subscribe(ORB_ID(airspeed));
	_param_sub = orb_subscribe(ORB_ID(parameter_update));


	// initialise parameters
	update_params();


	_perf_elapsed = perf_alloc_once(PC_ELAPSED, "wind_estimator elapsed");
	_perf_interval = perf_alloc_once(PC_INTERVAL, "wind_estimator interval");
}

lioneleeedadad · April 19, 2019, 8:05am

what is this ? can you provide more description ?

tumbili · April 22, 2019, 5:33pm

This is an example how to subscribe to a topic. You can also read the docs