Takeoff failedError data not sent

[anik123]

We tried to fly two parrot bebop 2 (namespace: bebop and bebop2) at the same time using local wifi (local router) using ROS. We have attached jetson board tx2 with each of the drone. We made each drone as a rosclient and used the laptop as a rosmaster. We connect each of the bebop from laptop using SSH over wifi. We run roslaunch bebop_driver bebop_node.launch for two bebop. Everythings ran without any problem. However, we tried this command rostopic pub bebop/takeoff std_msgs/Empty and rostopic pub bebop2/takeoff std_msgs/Empty. None of the bebop run and showed the following error.

Any hint on how to solve this issue?

Thanks in advance.