CMD: Unexpected command 520, result 0 and CMD: Unexpected command 176, result 0

Hi, I try to roslaunch mavros px4.launch fcu_url:="udp://:14540@127.0.0.1:14557" the last message that I got was CMD: Unexpected command 520, result 0 and after I tried to rosrun offb_node.cpp It seems that it didn’t work, then I checked the terminal which launch px4.launch, the last message that I got was CMD: Unexpected command 176, result 0.

Does anyone has experienced these kind of problem? I need help :smile: . Thanks