Problem of connecting with mavsdk on the remote computer

[alexey-gavrilov]

I tried connect px4-gazebo-headless using its docker with mavsdk example program (takeoff_and_land) that located on remote computer.

I set docker ip equal to 172.17.0.3/16, host computer ip equal to 10.1.0.9/8, remote computer ip equal to 10.1.2.143/8

I used next command to run take_off_land: ./takeof_and_land udp://:14540

At first I used next command to connect docker with host computer: docker run --rm -it jonasvautherin/px4-gazebo-headless:1.10.1 All worked fine.

Then I used next command to connect docker with remote computer: docker run --rm -it jonasvautherin/px4-gazebo-headless:1.10.1 10.1.2.143 But in this case the message “No system found , exiting” fired!

So how can I decide this problem?? What I did wrong?

[alexey-gavrilov]

Because I couldn't see any udp message from tcpdump , I also have tried to use the mavlink-routerd software. On the remote computer i executed next command: mavlink-routerd -e 10.1.2.143:14540 127.0.0.1:14540 Then I saw next udp messages with tcpdump: IP 10.1.0.9 .14580 > 10.1.2.143:14540, length 36 IP 10.1.0.9 .14580 > 10.1.2.143:14540, length 29 IP 10.1.0.9 .14580 > 10.1.2.143:14540, length 60 P 10.1.0.9 .14580 > 10.1.2.143:14540, length 36 IP 10.1.0.9 .14580 > 10.1.2.143:14540, length 28 and so on But I any way couldnt connect with takeoff_and_land with simulator!

[julianoes]

I just tried this and it worked for me.

Can you paste what output you get for the case that doesn't work?

I get this:

pxh> INFO  [mavlink] using network interface eth0, IP: 172.17.0.2
INFO  [mavlink] with netmask: 255.255.0.0
INFO  [mavlink] and broadcast IP: 172.17.255.255
INFO  [ekf2] Mag sensor ID changed to 197388
INFO  [ecl/EKF] EKF aligned, (pressure height, IMU buf: 22, OBS buf: 14)
INFO  [ecl/EKF] 728000: EKF GPS checks passed (WGS-84 origin set)
INFO  [mavlink] using network interface eth0, IP: 172.17.0.2
INFO  [mavlink] with netmask: 255.255.0.0
INFO  [mavlink] and broadcast IP: 172.17.255.255

And have you made sure that ping works between these computers, and that there is no firewall settings blocking incoming UDP packets?

[tvp100]

I also had the problem. I can only connet the localhost device. (And I must assign the ip to 192.168.220.1, which is my computer IP) await drone.connect(system_address="udp://192.168.220.20:14540") This code will not work. Only replact the 192.168.220.20 to localhost or omit it can work. Is there any way to connect to a custom IP?

[julianoes]

@tvp100 the drone needs to send it to where MAVSDK is running, not the other way round.

So PX4 needs to broadcast or send it to an IP, see: https://docs.px4.io/master/en/simulation/#enable-udp-broadcasting https://docs.px4.io/master/en/simulation/#enable-streaming-to-specific-address