How do you takeoff PX4ARDrone from MAVProxy?

I think something is not configured correctly on my end. Here are the commands I typed:

$ python mavproxy.py --master=/dev/cu.usbserial-A1011P1K --baud=57600

Logging to mav.tlog

MAV> online system 1 component 50

APM: [mavlink pm] sending list

Mode(0x00000000)> Mode Mode(0x00000000)

Received 232 parameters

Mode(0x00000000)>

Mode(0x00000000)> rc all 0

Mode(0x00000000)> rc 4 1815

Mode(0x00000000)> arm

But nothing happens. "arm" is executing this code:

mav.command_long_send(

self.target_system, # target_system

mavlink.MAV_COMP_ID_SYSTEM_CONTROL, # target_component

mavlink.MAV_CMD_COMPONENT_ARM_DISARM, # command

0, # confirmation

1, # param1 (1 to indicate arm)

0, # param2 (all other params meaningless)

0, # param3

0, # param4

0, # param5

0, # param6

0) # param7

Am I missing something?

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