Cannot give cmdVel command to all agent...

[cwsung]

lately I tried to use cmdVel to move three cfs to adopt cmdVel in my own formation control code. So, I write down the example script to give cmdVel to three cfs like below, but when I run this script only third cf which is "allcfs.crazyflies[2]" is move and other cfs are not react at all.. can anybody give me some advice of this problem? thk u!!

-> test script :

from pycrazyswarm import *

swarm = Crazyswarm()
timeHelper = swarm.timeHelper
allcfs = swarm.allcfs
step = 0

for cf in allcfs.crazyflies:
cf.cmdVel(0,0,0,0)
timeHelper.sleep(1)

for cf in allcfs.crazyflies:
cf.cmdVel(0,0,0,0)
timeHelper.sleep(1)

for cf in allcfs.crazyflies:
cf.cmdVel(0,0,0,0)
timeHelper.sleep(1)

start = timeHelper.time()
while 0.0 <= timeHelper.time() - start <= 2.0:
for cf in allcfs.crazyflies:
cf.cmdVel(0.0, 0.0, 0.0, 39400)
timeHelper.sleep(1)

print(timeHelper.time()-start)

while 2.0 <= timeHelper.time()- start <= 6.0:
for cf in allcfs.crazyflies:
cf.cmdVel(-1,0.0,0.0,39000)
timeHelper.sleep(1)

print(timeHelper.time()-start)