src/lib/drivers/magnetometer/PX4Magnetometer.cpp: Advertise the orb w…

…hen creating magnetometer driver instance

This ensures that magnetometers instance numbers are allocated in the driver start order.

It is problematic if the magnetometers get different IDs on different HW even if the start order of the
drivers in the init scripts is the same.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

src/lib/drivers/magnetometer/PX4Magnetometer.cpp

@@ -40,6 +40,7 @@ PX4Magnetometer::PX4Magnetometer(uint32_t device_id, enum Rotation rotation) :
 	_device_id{device_id},
 	_rotation{rotation}
 {
+	_sensor_pub.advertise();
 }
 
 PX4Magnetometer::~PX4Magnetometer()