Can I read message by pixhawk from other Pixhawk?

1

I’m trying to do formation flight with two quadcopter,but it can’t receive gps location from other pixhawk,can anyone help?thx

2

Yes, as long as you have a connection between them there’s nothing stopping you from sending mavlink messages from one pixhawk to another. You’ll need to give each vehicle a unique mavlink system id.
http://mavlink.org/messages/common

3

Thanks for your reply,but I didn’t figure out how to do.

4

You’ll have to provide more detail. Sending mavlink messages from one pixhawk directly to another is just the start. Formation flight like this isn’t going to work without modification.

5

I’ve find somewhere to midify code to do formation flight,now I have to do is transport GPS location from one pixhawk to another pixhawk.

6

There are a few existing mechanisms (reposition, follow me, offboard control) you could use to do this, repurpose existing mavlink messages, or add new ones.
http://mavlink.org/messages/common

For example you could have one vehicle send the command MAV_CMD_DO_REPOSITION to the other, or look at the way follow me is implemented.

7

Can I do this without GCS?

8

Yes, although having one connected is often helpful.

9

Now I have to know how to send mavlink message from one to another pixhawk,becauce I don’t know how to do yet.

10

All mavlink messages are sent and received by the mavlink module here - https://github.com/PX4/Firmware/tree/master/src/modules/mavlink

If you’d like to see a smaller self contained example of how to use mavlink, take a look at this - https://github.com/mavlink/c_uart_interface_example

11

How do I know have it send mav message from one to another or not?

12

Hey, I am sending mav messages like in the https://github.com/mavlink/c_uart_interface_example.
In my setup, the pixhawk receives only every 0.3 seconds a new offboard position or velocity.
Is there a possibility for a faster update rate?
Thanks for your help