I tried to install the PX4 firmware, for indoor navigation reasons, on the Erle brain3 (kinetic) using "sudo apt-get install px4-erle-robotics". But I can't get it to work. I have managed to connnect it to QGroundControl, but it says that the firmware is not regognized. If I view "rostopic echo /diagnostics" I see that that FCU is not connected. If I look at the status of mavros and mavros-serial2, I see that they are active. If I start px4 via "sudo systemctl start px4", it stays active for a while, but the FCU is still unsupported.