Thank you very much for this precious answer. After trying the links you gave me, it seems that I cannot connect APM Planner to the rover but I do not know what I am missing... I did install the latest version from the github master branch (2.0.26-rc2) on my laptop with ubuntu 18.04. I did add the UDP link (I mean I think I did as it appears in the logs), but when I restart APM planner it seems that it is not connected because I do not have all the items in the APM planner menu as depicted in the links you gave me... Here are two screen captures of what I did:
By the way I also installed the teleoperation ros node from the ros_erle_cpp_teleoperation_erle_rover package on the rover but it did not help to move the robot.... I am guessing that it does not allows to move the rover because the mode is not manual as I would like it to be.
Do you have any idea of what I am doing wrong with APM planner? Is it possible to not use APM planner and still change the mode to manual?
Thank you in advance for your responses