startup: NuttX seems to free memory only AFTER the next command is issued, requiring us to give it some time to do memory management so it does not keep starting tasks on top of each other. May need some consideration on main startup script as well.

ROMFS/px4fmu_common/init.d/rc.usb

@@ -6,11 +6,17 @@
 mavlink start -r 10000 -d /dev/ttyACM0
 # Enable a number of interesting streams we want via USB
 mavlink stream -d /dev/ttyACM0 -s NAMED_VALUE_FLOAT -r 10
+usleep 1000
 mavlink stream -d /dev/ttyACM0 -s OPTICAL_FLOW -r 10
+usleep 1000
 mavlink stream -d /dev/ttyACM0 -s VFR_HUD -r 20
+usleep 1000
 mavlink stream -d /dev/ttyACM0 -s ATTITUDE -r 20
+usleep 1000
 mavlink stream -d /dev/ttyACM0 -s ATTITUDE_CONTROLS -r 30
+usleep 1000
 mavlink stream -d /dev/ttyACM0 -s SERVO_OUTPUT_RAW_0 -r 20
+usleep 1000
 
 # Exit shell to make it available to MAVLink
 exit