MAVProxy is a console based MAVLink Ground Control Station (GCS) [authored by Andrew Tridgell][tridge-mavproxy]. The SMACCMPilot project maintains [a fork of MAVProxy][smaccm-mavlink] which is distributed as a project submodule.
The MAVProxy commands supported by SMACCMPilot include the following, but these are subject to change:
alt: Show altitude
arm: Arm motors, assuming kill switch on the hobby radio controller is enabled
disarm: Disarm motors
joystick: Enable joystick flight
mode: Set SMACCMPilot flight mode
param: Manage SMACCMPilot parameters
status: Show flight data
stream: Set streaming rate
watch: Watch a MAVLink pattern
help in the the MAVProxy window for more information.
With respect to arming, the hobby radio controller is considered a safety backup controller. See the instructions on arming from the radio controller for more information.