Issue in sending command to all crazyflies

[fbenti]

I'm currently having problems sending commands to all crazyflies.

sending sequential commands as below, everything works fine, the two drones that I'm using take off and land.

swarm = Crazyswarm()
timeHelper = swarm.timeHelper
allcfs = swarm.allcfs
for cf in allcfs.crazyflies:
    cf.takeoff(targetHeight=Z, duration=1.0+Z)
timeHelper.sleep(1.5+Z)
for cf in allcfs.crazyflies:
    cf.land(targetHeight=0.02, duration=2.5)

And this is the message in the stdout:

[ INFO] [1665483673.210999132]: [cf1] Takeoff
[ INFO] [1665483673.225482237]: [cf7] Takeoff
[ INFO] [1665483675.742665321]: [cf1] Land
[ INFO] [1665483675.757914551]: [cf7] Land

HOWEVER, when I use the default takeoff and land command for swarm, as below, nothing happen.

allcfs.takeoff(targetHeight=Z, duration=1.0+Z)
timeHelper.sleep(1.5+Z)
allcfs.land(targetHeight=0.02, duration=1.0+Z)
timeHelper.sleep(1.0+Z)

[ INFO] [1665483845.223266419]: Takeoff!
[ INFO] [1665483847.755985005]: Land!