CLI tools

Standalone executables shipped by bar_ros2. The primary entry point is the unified bar CLI from bar_cli — bar bus ping, bar bus discover, bar motor slider, bar viz rerun, bar viz viser, bar calibrate. Every underlying executable is also reachable directly as ros2 run <package> <executable>; the bar CLI is a thin verb/noun wrapper that calls os.execvp on those same targets.

(No pianist_ros2 packages register CLI executables today — they ship policy runner / bridge / MIDI driver nodes that you reach via ros2 launch ….)

Index

Executable	Package	Repo	What it does
bar (unified CLI)	bar_cli	bar_ros2	Verb/noun entry point (bar bus ping, bar bus discover, bar motor slider, bar viz rerun, …).
robstride_ping	bar_robstride	bar_ros2	Single-actuator probe (GetDeviceId / OperationStatus). Read-only.
robstride_discover	bar_robstride	bar_ros2	Scan a CAN ID range, print every device that replies. Read-only.
mit_slider_gui	bar_robstride	bar_ros2	Qt slider window publishing Float64MultiArray to a forward_command_controller.
mode_manager	bar_controllers	bar_ros2	The FSM orchestrator. Normally launched by bringup; sometimes useful to start manually.
calibrate_robot	bar_bringup_lite	bar_ros2	Sample (min, max) per joint; write calibration.yaml on Ctrl+C.
rerun_viz	bar_bringup_lite	bar_ros2	Native rerun viewer subscribed to /robot_description + /lite/joint_states.
viser_viz	bar_bringup_lite	bar_ros2	Browser viewer (default port 8080). Same subscriptions.
remote_policy_runner	bar_policy	bar_ros2	Generic out-of-process ONNX policy runner (used by lite_policy.launch.py).
piano_policy_runner	pianist_policy	pianist_ros2	Piano-task subclass of remote_policy_runner (used by piano_policy.launch.py).
piano_state_bridge	pianist_policy	pianist_ros2	Sim-side bridge — JointState piano keys → /piano/key_state bool stream.
midi_keyboard_driver	pianist_policy	pianist_ros2	USB-MIDI input → /piano/key_state (real-piano counterpart of the sim bridge).

Per-tool reference

robstride_ping

ros2 run bar_robstride robstride_ping --iface can0 --id 11
ros2 run bar_robstride robstride_ping --iface can0 --id 11 --read-status

# Equivalent via the unified CLI:
bar bus ping --iface can0 --id 11

Arg	Default	Description
--iface	can0	SocketCAN interface
--id	32	Target Robstride device ID
--timeout-ms	500	How long to wait for the reply
--read-status	(off)	After GetDeviceId, also Enable → wait for OperationStatus → Disable, for a one-shot pose / fault read

Read-only when --read-status is omitted. With --read-status, the motor is briefly Enabled and Disabled — no MIT operation control, no commanded motion, but the actuator does transition Enable → Disable internally.

Used in: Tutorials → Drive one Robstride, How-to → Probe CAN bus.

robstride_discover

ros2 run bar_robstride robstride_discover --iface can0
ros2 run bar_robstride robstride_discover --iface can0 \
    --scan-from 1 --scan-to 127 --per-id-wait-ms 8

# Equivalent via the unified CLI:
bar bus discover --iface can0

Arg	Default	Description
--iface	can0	SocketCAN interface
--scan-from	1	Lowest ID to ping
--scan-to	32	Highest ID to ping (inclusive; clamped to 127)
--host-id	253	Host CAN ID used in the GetDeviceId frame
--per-id-wait-ms	8	Gap between successive ping sends
--drain-ms	200	Listen window after the last ping

Read-only — only GetDeviceId is sent. Background drain thread keeps the RX ring from filling during long scans.

Exit code: 0 if anything answered, 3 if scan completed cleanly with zero replies. Both are useful in CI.

Used in: How-to → Probe CAN bus, Hardware specs → Bus-bring-up checklist.

mit_slider_gui

ros2 run bar_robstride mit_slider_gui
ros2 run bar_robstride mit_slider_gui \
    --joint actuator_1 \
    --command-topic /forward_mit_controller/commands \
    --position-range -3.14 3.14 \
    --kp-range 0 10

# Equivalent via the unified CLI:
bar motor slider

Arg	Default	Description
--joint	actuator_1	Joint name to read from /joint_states
--command-topic	/forward_mit_controller/commands	Float64MultiArray topic to publish to
--state-topic	/lite/joint_states	For the live readout
--position-range	-3.14159 3.14159	Slider range, rad
--velocity-range	-1.0 1.0	rad/s
--effort-range	-1.0 1.0	Nm
--kp-range	0.0 10.0	N·m/rad
--kd-range	0.0 1.0	N·m·s/rad
--default-kp	2.0	Initial slider value
--default-kd	0.5	Initial slider value

Requires python_qt_binding (installed alongside rqt_reconfigure).

Used in: Tutorials → Drive one Robstride, How-to → mit_slider_gui.

mode_manager

ros2 run bar_controllers mode_manager
ros2 run bar_controllers mode_manager --ros-args -p tick_rate_hz:=100

Parameter	Default	Description
tick_rate_hz	50.0	Timer rate for tick()
controller_manager	/controller_manager	CM namespace
joy.damp_button	2	DAMP button index (default = X on Xbox)
joy.quit_button	6	QUIT button index (default = BACK)
joy.load_combo_remote	[4, 0]	LOAD combo paired with R1+A (default = L1+A)
joy.load_combo_locomotion	[4, 1]	LOAD combo paired with R1+B (default = L1+B)
joy.start_combo_remote	[5, 0]	START_REMOTE (default = R1+A)
joy.start_combo_locomotion	[5, 1]	START_LOCOMOTION (default = R1+B)

Normally launched by real.launch.py / mujoco.launch.py. Useful to run standalone when debugging the joy decoder.

Used in: Concepts → Five-mode FSM, Reference → Controllers.

calibrate_robot

ros2 run bar_bringup_lite calibrate_robot --output ./calibration.yaml
ros2 run bar_bringup_lite calibrate_robot \
    --output ./calibration.yaml --sweep-threshold 0.3

Arg	Default	Description
--output	(required)	Path to write the resulting YAML
--sweep-threshold	0.5	Min sweep (rad) below which the prior homing_offset is preserved

Normally launched by calibrate.launch.py (which sets --output from a launch arg and brings up the rest of the stack). Standalone invocation is useful if you already have real.launch.py running with calibration_file:=''.

Used in: How-to → Calibrate the zero pose.

rerun_viz / viser_viz

The two live-viewer executables. On the tethered deployment they are spawned via ros2 launch bar_bringup_lite viz.launch.py on the operator workstation (viewer:=viser by default; viewer:=rerun for the native window). Direct invocation is the single-machine sim/dev shortcut:

ros2 run bar_bringup_lite rerun_viz       # native rerun window
ros2 run bar_bringup_lite viser_viz       # browser viewer at http://0.0.0.0:8080

Both read /robot_description (latched) once, subscribe to a --joint-state-topic (default /lite/joint_states), and render the live pose. rerun-sdk, viser, yourdfpy, and scipy ship in the workspace env.

Used in: How-to → Live viz, Concepts → Architecture → Deployment topology.

Adding a new CLI tool

For a tool that ships from one of the existing packages:

1. Drop the source in <package>/scripts/<name>.py (Python) or <package>/src/<name>.cpp (C++).
2. In the package's CMakeLists.txt, install it under lib/${PROJECT_NAME} without the .py extension so ros2 run finds it:

   install(
     PROGRAMS scripts/<name>.py
     DESTINATION lib/${PROJECT_NAME}
     RENAME <name>
   )
   For C++ add the executable target and install it normally — the install(TARGETS ... RUNTIME DESTINATION ...) lines.
3. Rebuild with colcon build --symlink-install --packages-select <package>.
4. Verify with ros2 pkg executables <package>.

The --symlink-install flag means Python scripts edit-loop without rebuilding — useful while iterating.