Multiple drones do not takeoff in parallel

[MelSoS]

Dear all,

I'm using the HelloDrone C++ example code und adapted the settings.json + the example code to 10 drones.

Now, for the takeoff: the original file uses
std::cout << "Press Enter to takeoff" << std::endl; std::cin.get(); float takeoffTimeout = 5; client.takeoffAsync(takeoffTimeout)->waitOnLastTask();

I adapted the code (for each drone "Drone1" to "Drone10") to:
client.takeoffAsync(takeoffTimeout, "Drone1")->waitOnLastTask();

Now, in the simulation each drone takes off after takeOffTimeout from the previous drone, is there a possibility to start them all in parallel?
I already tried (all options not working):
client.takeoffAsync(0, "Drone1")->waitOnLastTask();
client.takeoffAsync(takeoffTimeout, "Drone1");

Thank you and best regards,
MelSoS

[madratman]

You don't need the ->waitOnLastTask(), it basically waits to proceed to next command until the takeoff is complete.

This should work

int num_drones = 10;
takeoffTimeout = 5;

for (int drone_idx = 0; drone_idx<num_drones; drone_idx++)
{
   client.takeoffAsync(takeoffTimeout, "Drone"+std::to_string(drone_idx));
}