Roscopter waypoint rosservice returns false

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I'm currently using roscopter to connect to my quadcopter IRIS.

I'm connecting to the roscopter by executing:

rosrun roscopter driver.py --device=/dev/ttyUSB0 --baudrate 57600

And I can successfully arm it using

rosservice call /command 3

However, when I try to send it a waypoint, I just get a false returned

rosservice call /waypoint "waypoint: {latitude: 10, longitude: 10, altitude: 10, pos_acc: 10, speed_to: 10, hold_time: 10, yaw_from: 10, pan_angle: 10, tilt_angle: 10, waypoint_type: 1}"

Does anyone know why it's failing to send waypoints?