javaclient2
Class LimbInterface

java.lang.Object
  javaclient2.PlayerDevice
      javaclient2.LimbInterface

All Implemented Interfaces:

PlayerConstants

public class LimbInterface
extends PlayerDevice

The limb interface provides access to a multi-jointed limb.

Version:

• v2.0 - Player 2.0 supported

Author:

Radu Bogdan Rusu

Field Summary

Fields inherited from class javaclient2.PlayerDevice

is, os, pc

Fields inherited from interface javaclient2.structures.PlayerConstants

MCOM_CHANNEL_LEN, MCOM_DATA_BUFFER_SIZE, MCOM_DATA_LEN, MCOM_N_BUFS, PLAYER_ACTARRAY_ACTSTATE_BRAKED, PLAYER_ACTARRAY_ACTSTATE_IDLE, PLAYER_ACTARRAY_ACTSTATE_MOVING, PLAYER_ACTARRAY_ACTSTATE_STALLED, PLAYER_ACTARRAY_BRAKES_REQ, PLAYER_ACTARRAY_CODE, PLAYER_ACTARRAY_DATA_STATE, PLAYER_ACTARRAY_GET_GEOM_REQ, PLAYER_ACTARRAY_HOME_CMD, PLAYER_ACTARRAY_NUM_ACTUATORS, PLAYER_ACTARRAY_POS_CMD, PLAYER_ACTARRAY_POWER_REQ, PLAYER_ACTARRAY_SPEED_CMD, PLAYER_ACTARRAY_SPEED_REQ, PLAYER_ACTARRAY_STRING, PLAYER_ACTARRAY_TYPE_LINEAR, PLAYER_ACTARRAY_TYPE_ROTARY, PLAYER_AIO_CMD_STATE, PLAYER_AIO_CODE, PLAYER_AIO_DATA_STATE, PLAYER_AIO_MAX_INPUTS, PLAYER_AIO_MAX_OUTPUTS, PLAYER_AIO_STRING, PLAYER_AUDIO_CODE, PLAYER_AUDIO_COMMAND_BUFFER_SIZE, PLAYER_AUDIO_DATA_BUFFER_SIZE, PLAYER_AUDIO_PAIRS, PLAYER_AUDIO_STRING, PLAYER_AUDIODSP_CODE, PLAYER_AUDIODSP_DATA_TONES, PLAYER_AUDIODSP_GET_CONFIG, PLAYER_AUDIODSP_MAX_BITSTRING_LEN, PLAYER_AUDIODSP_MAX_FREQS, PLAYER_AUDIODSP_PLAY_CHIRP, PLAYER_AUDIODSP_PLAY_TONE, PLAYER_AUDIODSP_REPLAY, PLAYER_AUDIODSP_SET_CONFIG, PLAYER_AUDIODSP_STRING, PLAYER_AUDIOMIXER_CODE, PLAYER_AUDIOMIXER_GET_LEVELS, PLAYER_AUDIOMIXER_SET_IGAIN, PLAYER_AUDIOMIXER_SET_LINE, PLAYER_AUDIOMIXER_SET_MASTER, PLAYER_AUDIOMIXER_SET_MIC, PLAYER_AUDIOMIXER_SET_OGAIN, PLAYER_AUDIOMIXER_SET_PCM, PLAYER_AUDIOMIXER_STRING, PLAYER_BLINKENLIGHT_CMD_COLOR, PLAYER_BLINKENLIGHT_CMD_DUTYCYCLE, PLAYER_BLINKENLIGHT_CMD_PERIOD, PLAYER_BLINKENLIGHT_CMD_POWER, PLAYER_BLINKENLIGHT_CMD_STATE, PLAYER_BLINKENLIGHT_CODE, PLAYER_BLINKENLIGHT_DATA_STATE, PLAYER_BLINKENLIGHT_STRING, PLAYER_BLOBFINDER_CODE, PLAYER_BLOBFINDER_DATA_BLOBS, PLAYER_BLOBFINDER_MAX_BLOBS, PLAYER_BLOBFINDER_REQ_SET_COLOR, PLAYER_BLOBFINDER_REQ_SET_IMAGER_PARAMS, PLAYER_BLOBFINDER_STRING, PLAYER_BUMPER_CODE, PLAYER_BUMPER_DATA_GEOM, PLAYER_BUMPER_DATA_STATE, PLAYER_BUMPER_GET_GEOM, PLAYER_BUMPER_MAX_SAMPLES, PLAYER_BUMPER_STRING, PLAYER_CAMERA_CODE, PLAYER_CAMERA_COMPRESS_JPEG, PLAYER_CAMERA_COMPRESS_RAW, PLAYER_CAMERA_DATA_STATE, PLAYER_CAMERA_FORMAT_MONO16, PLAYER_CAMERA_FORMAT_MONO8, PLAYER_CAMERA_FORMAT_RGB565, PLAYER_CAMERA_FORMAT_RGB888, PLAYER_CAMERA_IMAGE_HEIGHT, PLAYER_CAMERA_IMAGE_SIZE, PLAYER_CAMERA_IMAGE_WIDTH, PLAYER_CAMERA_STRING, PLAYER_CLOSE_MODE, PLAYER_DATAMODE_PULL, PLAYER_DATAMODE_PUSH, PLAYER_DIO_CMD_VALUES, PLAYER_DIO_CODE, PLAYER_DIO_DATA_VALUES, PLAYER_DIO_STRING, PLAYER_ENERGY_CODE, PLAYER_ENERGY_DATA_STATE, PLAYER_ENERGY_SET_CHARGING_POLICY_REQ, PLAYER_ENERGY_STRING, PLAYER_ERROR_MODE, PLAYER_FIDUCIAL_CODE, PLAYER_FIDUCIAL_DATA_SCAN, PLAYER_FIDUCIAL_MAX_SAMPLES, PLAYER_FIDUCIAL_REQ_GET_FOV, PLAYER_FIDUCIAL_REQ_GET_GEOM, PLAYER_FIDUCIAL_REQ_GET_ID, PLAYER_FIDUCIAL_REQ_SET_FOV, PLAYER_FIDUCIAL_REQ_SET_ID, PLAYER_FIDUCIAL_STRING, PLAYER_GPS_CODE, PLAYER_GPS_DATA_STATE, PLAYER_GPS_STRING, PLAYER_GRAPHICS2D_CMD_CLEAR, PLAYER_GRAPHICS2D_CMD_DRAW, PLAYER_GRAPHICS2D_CMD_POINTS, PLAYER_GRAPHICS2D_CMD_POLYGON, PLAYER_GRAPHICS2D_CMD_POLYLINE, PLAYER_GRAPHICS2D_CODE, PLAYER_GRAPHICS2D_MAX_POINTS, PLAYER_GRAPHICS2D_STRING, PLAYER_GRAPHICS3D_CMD_CLEAR, PLAYER_GRAPHICS3D_CODE, PLAYER_GRAPHICS3D_MAX_POINTS, PLAYER_GRAPHICS3D_STRING, PLAYER_GRIPPER_CMD_STATE, PLAYER_GRIPPER_CODE, PLAYER_GRIPPER_DATA_STATE, PLAYER_GRIPPER_REQ_GET_GEOM, PLAYER_GRIPPER_STRING, PLAYER_HEALTH_CODE, PLAYER_HEALTH_DATA, PLAYER_HEALTH_STRING, PLAYER_IDENT_STRLEN, PLAYER_IMU_CODE, PLAYER_IMU_DATA_CALIB, PLAYER_IMU_DATA_EULER, PLAYER_IMU_DATA_QUAT, PLAYER_IMU_DATA_STATE, PLAYER_IMU_REQ_SET_DATATYPE, PLAYER_IMU_STRING, PLAYER_IR_CODE, PLAYER_IR_DATA_RANGES, PLAYER_IR_MAX_SAMPLES, PLAYER_IR_POSE, PLAYER_IR_POWER, PLAYER_IR_STRING, PLAYER_JOYSTICK_CODE, PLAYER_JOYSTICK_DATA_STATE, PLAYER_JOYSTICK_STRING, PLAYER_KEYLEN, PLAYER_LASER_CODE, PLAYER_LASER_DATA_SCAN, PLAYER_LASER_DATA_SCANPOSE, PLAYER_LASER_MAX_SAMPLES, PLAYER_LASER_REQ_GET_CONFIG, PLAYER_LASER_REQ_GET_GEOM, PLAYER_LASER_REQ_POWER, PLAYER_LASER_REQ_SET_CONFIG, PLAYER_LASER_STRING, PLAYER_LIMB_BRAKES_REQ, PLAYER_LIMB_CODE, PLAYER_LIMB_DATA, PLAYER_LIMB_GEOM_REQ, PLAYER_LIMB_HOME_CMD, PLAYER_LIMB_POWER_REQ, PLAYER_LIMB_SETPOSE_CMD, PLAYER_LIMB_SETPOSITION_CMD, PLAYER_LIMB_SPEED_REQ, PLAYER_LIMB_STATE_BRAKED, PLAYER_LIMB_STATE_COLL, PLAYER_LIMB_STATE_IDLE, PLAYER_LIMB_STATE_MOVING, PLAYER_LIMB_STATE_OOR, PLAYER_LIMB_STOP_CMD, PLAYER_LIMB_STRING, PLAYER_LIMB_VECMOVE_CMD, PLAYER_LOCALIZE_CODE, PLAYER_LOCALIZE_DATA_HYPOTHS, PLAYER_LOCALIZE_MAX_HYPOTHS, PLAYER_LOCALIZE_PARTICLES_MAX, PLAYER_LOCALIZE_REQ_GET_PARTICLES, PLAYER_LOCALIZE_REQ_SET_POSE, PLAYER_LOCALIZE_STRING, PLAYER_LOG_CODE, PLAYER_LOG_REQ_GET_STATE, PLAYER_LOG_REQ_SET_FILENAME, PLAYER_LOG_REQ_SET_READ_REWIND, PLAYER_LOG_REQ_SET_READ_STATE, PLAYER_LOG_REQ_SET_WRITE_STATE, PLAYER_LOG_STRING, PLAYER_LOG_TYPE_READ, PLAYER_LOG_TYPE_WRITE, PLAYER_MAP_CODE, PLAYER_MAP_DATA_INFO, PLAYER_MAP_MAX_SEGMENTS, PLAYER_MAP_MAX_TILE_SIZE, PLAYER_MAP_REQ_GET_DATA, PLAYER_MAP_REQ_GET_INFO, PLAYER_MAP_REQ_GET_VECTOR, PLAYER_MAP_STRING, PLAYER_MAX_DEVICES, PLAYER_MAX_DRIVER_STRING_LEN, PLAYER_MAX_MESSAGE_SIZE, PLAYER_MAX_REQREP_SIZE, PLAYER_MCOM_CLEAR, PLAYER_MCOM_CODE, PLAYER_MCOM_POP, PLAYER_MCOM_PUSH, PLAYER_MCOM_READ, PLAYER_MCOM_SET_CAPACITY, PLAYER_MCOM_STRING, PLAYER_MSGQUEUE_DEFAULT_MAXLEN, PLAYER_MSGTYPE_CMD, PLAYER_MSGTYPE_DATA, PLAYER_MSGTYPE_REQ, PLAYER_MSGTYPE_RESP_ACK, PLAYER_MSGTYPE_RESP_NACK, PLAYER_MSGTYPE_SYNCH, PLAYER_NOMAD_CODE, PLAYER_NOMAD_STRING, PLAYER_NULL_CODE, PLAYER_NULL_STRING, PLAYER_OPAQUE_CODE, PLAYER_OPAQUE_STRING, PLAYER_OPEN_MODE, PLAYER_PLANNER_CMD_GOAL, PLAYER_PLANNER_CODE, PLAYER_PLANNER_DATA_STATE, PLAYER_PLANNER_MAX_WAYPOINTS, PLAYER_PLANNER_REQ_ENABLE, PLAYER_PLANNER_REQ_GET_WAYPOINTS, PLAYER_PLANNER_STRING, PLAYER_PLAYER_CODE, PLAYER_PLAYER_REQ_ADD_REPLACE_RULE, PLAYER_PLAYER_REQ_AUTH, PLAYER_PLAYER_REQ_DATA, PLAYER_PLAYER_REQ_DATAFREQ, PLAYER_PLAYER_REQ_DATAMODE, PLAYER_PLAYER_REQ_DEV, PLAYER_PLAYER_REQ_DEVLIST, PLAYER_PLAYER_REQ_DRIVERINFO, PLAYER_PLAYER_REQ_IDENT, PLAYER_PLAYER_REQ_NAMESERVICE, PLAYER_PLAYER_STRING, PLAYER_POINTCLOUD3D_CODE, PLAYER_POINTCLOUD3D_DATA_STATE, PLAYER_POINTCLOUD3D_MAX_POINTS, PLAYER_POINTCLOUD3D_STRING, PLAYER_POSITION1D_CMD_POS, PLAYER_POSITION1D_CMD_VEL, PLAYER_POSITION1D_CODE, PLAYER_POSITION1D_DATA_GEOM, PLAYER_POSITION1D_DATA_STATE, PLAYER_POSITION1D_REQ_GET_GEOM, PLAYER_POSITION1D_REQ_MOTOR_POWER, PLAYER_POSITION1D_REQ_POSITION_MODE, PLAYER_POSITION1D_REQ_POSITION_PID, PLAYER_POSITION1D_REQ_RESET_ODOM, PLAYER_POSITION1D_REQ_SET_ODOM, PLAYER_POSITION1D_REQ_SPEED_PID, PLAYER_POSITION1D_REQ_SPEED_PROF, PLAYER_POSITION1D_REQ_VELOCITY_MODE, PLAYER_POSITION1D_STATUS_ENABLED, PLAYER_POSITION1D_STATUS_LIMIT_CEN, PLAYER_POSITION1D_STATUS_LIMIT_MAX, PLAYER_POSITION1D_STATUS_LIMIT_MIN, PLAYER_POSITION1D_STATUS_OC, PLAYER_POSITION1D_STATUS_TRAJ_COMPLETE, PLAYER_POSITION1D_STRING, PLAYER_POSITION2D_CMD_CAR, PLAYER_POSITION2D_CMD_POS, PLAYER_POSITION2D_CMD_VEL, PLAYER_POSITION2D_CODE, PLAYER_POSITION2D_DATA_GEOM, PLAYER_POSITION2D_DATA_STATE, PLAYER_POSITION2D_REQ_GET_GEOM, PLAYER_POSITION2D_REQ_MOTOR_POWER, PLAYER_POSITION2D_REQ_POSITION_MODE, PLAYER_POSITION2D_REQ_POSITION_PID, PLAYER_POSITION2D_REQ_RESET_ODOM, PLAYER_POSITION2D_REQ_SET_ODOM, PLAYER_POSITION2D_REQ_SPEED_PID, PLAYER_POSITION2D_REQ_SPEED_PROF, PLAYER_POSITION2D_REQ_VELOCITY_MODE, PLAYER_POSITION2D_STRING, PLAYER_POSITION3D_CMD_SET_POS, PLAYER_POSITION3D_CMD_SET_VEL, PLAYER_POSITION3D_CODE, PLAYER_POSITION3D_DATA_GEOMETRY, PLAYER_POSITION3D_DATA_STATE, PLAYER_POSITION3D_GET_GEOM, PLAYER_POSITION3D_MOTOR_POWER, PLAYER_POSITION3D_POSITION_MODE, PLAYER_POSITION3D_POSITION_PID, PLAYER_POSITION3D_RESET_ODOM, PLAYER_POSITION3D_SET_ODOM, PLAYER_POSITION3D_SPEED_PID, PLAYER_POSITION3D_SPEED_PROF, PLAYER_POSITION3D_STRING, PLAYER_POSITION3D_VELOCITY_MODE, PLAYER_POWER_CODE, PLAYER_POWER_DATA_STATE, PLAYER_POWER_MASK_CHARGING, PLAYER_POWER_MASK_JOULES, PLAYER_POWER_MASK_PERCENT, PLAYER_POWER_MASK_VOLTS, PLAYER_POWER_MASK_WATTS, PLAYER_POWER_SET_CHARGING_POLICY_REQ, PLAYER_POWER_STRING, PLAYER_PTZ_CMD_STATE, PLAYER_PTZ_CODE, PLAYER_PTZ_DATA_GEOM, PLAYER_PTZ_DATA_STATE, PLAYER_PTZ_MAX_CONFIG_LEN, PLAYER_PTZ_POSITION_CONTROL, PLAYER_PTZ_REQ_AUTOSERVO, PLAYER_PTZ_REQ_CONTROL_MODE, PLAYER_PTZ_REQ_GENERIC, PLAYER_PTZ_REQ_GEOM, PLAYER_PTZ_STRING, PLAYER_PTZ_VELOCITY_CONTROL, PLAYER_RFID_CODE, PLAYER_RFID_DATA, PLAYER_RFID_MAX_GUID, PLAYER_RFID_MAX_TAGS, PLAYER_RFID_REQ_LOCKTAG, PLAYER_RFID_REQ_POWER, PLAYER_RFID_REQ_READTAG, PLAYER_RFID_REQ_WRITETAG, PLAYER_RFID_STRING, PLAYER_SERVICE_ADV_CODE, PLAYER_SERVICE_ADV_STRING, PLAYER_SIMULATION_CODE, PLAYER_SIMULATION_IDENTIFIER_MAXLEN, PLAYER_SIMULATION_REQ_GET_POSE2D, PLAYER_SIMULATION_REQ_SET_POSE2D, PLAYER_SIMULATION_STRING, PLAYER_SONAR_CODE, PLAYER_SONAR_DATA_GEOM, PLAYER_SONAR_DATA_RANGES, PLAYER_SONAR_MAX_SAMPLES, PLAYER_SONAR_REQ_GET_GEOM, PLAYER_SONAR_REQ_POWER, PLAYER_SONAR_STRING, PLAYER_SOUND_CMD_IDX, PLAYER_SOUND_CODE, PLAYER_SOUND_STRING, PLAYER_SPEECH_CMD_SAY, PLAYER_SPEECH_CODE, PLAYER_SPEECH_MAX_STRING_LEN, PLAYER_SPEECH_RECOGNITION_CODE, PLAYER_SPEECH_RECOGNITION_STRING, PLAYER_SPEECH_STRING, PLAYER_TRUTH_CODE, PLAYER_TRUTH_DATA_FIDUCIAL_ID, PLAYER_TRUTH_DATA_POSE, PLAYER_TRUTH_REQ_GET_FIDUCIAL_ID, PLAYER_TRUTH_REQ_SET_FIDUCIAL_ID, PLAYER_TRUTH_REQ_SET_POSE, PLAYER_TRUTH_STRING, PLAYER_WAVEFORM_CODE, PLAYER_WAVEFORM_DATA_MAX, PLAYER_WAVEFORM_DATA_SAMPLE, PLAYER_WAVEFORM_STRING, PLAYER_WIFI_CODE, PLAYER_WIFI_DATA_STATE, PLAYER_WIFI_IWSPY_ADD, PLAYER_WIFI_IWSPY_DEL, PLAYER_WIFI_IWSPY_PING, PLAYER_WIFI_MAC, PLAYER_WIFI_MAX_LINKS, PLAYER_WIFI_MODE_ADHOC, PLAYER_WIFI_MODE_AUTO, PLAYER_WIFI_MODE_INFRA, PLAYER_WIFI_MODE_MASTER, PLAYER_WIFI_MODE_REPEAT, PLAYER_WIFI_MODE_SECOND, PLAYER_WIFI_MODE_UNKNOWN, PLAYER_WIFI_QUAL_DBM, PLAYER_WIFI_QUAL_REL, PLAYER_WIFI_QUAL_UNKNOWN, PLAYER_WIFI_STRING, PLAYER_WSN_CMD_DEVSTATE, PLAYER_WSN_CODE, PLAYER_WSN_DATA, PLAYER_WSN_MAX_NODES, PLAYER_WSN_REQ_DATAFREQ, PLAYER_WSN_REQ_DATATYPE, PLAYER_WSN_REQ_POWER, PLAYER_WSN_STRING, SPEECH_RECOGNITION_DATA_STRING, SPEECH_RECOGNITION_TEXT_LEN

Constructor Summary

LimbInterface(PlayerClient pc)
Constructor for LimbInterface.

Method Summary

PlayerLimbData	getData() Get the Limb data.
PlayerLimbGeomReq	getGeom() Get the geometry data.
protected void	handleResponse(PlayerMsgHdr header) Handle acknowledgement response messages.
void	homeCmd() Command: home (PLAYER_LIMB_HOME_CMD) Tells the end effector to return to its home position.
boolean	isDataReady() Check if data is available.
boolean	isGeomReady() Check if geometry data is available.
void	queryGeometry() Request/reply: Query geometry.
void	readData(PlayerMsgHdr header) Read the Limb data.
void	setBrakes(int value) Request/reply: Brakes.
void	setPose(PlayerPoint3d position, PlayerPoint3d approach, PlayerPoint3d orientation) Command: Set end effector pose (PLAYER_LIMB_SETPOSE_CMD).
void	setPosition(PlayerPoint3d position) Command: Set end effector position (PLAYER_LIMB_SETPOSITION_CMD).
void	setPower(int value) Request/reply: Power.
void	setSpeed(float speed) Request/reply: Speed.
void	stopCmd() Command: stop (PLAYER_LIMB_STOP_CMD) Tells the limb to stop moving immediatly.
void	vectorMove(PlayerPoint3d direction, float length) Command: Vector move the end effector (PLAYER_LIMB_VECMOVE_CMD).

Methods inherited from class javaclient2.PlayerDevice

getDeviceAccess, getDeviceAddress, getDeviceDriverName, handleNARMessage, sendHeader, setDeviceAccess, setDeviceAddress, setDeviceDriverName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LimbInterface

public LimbInterface(PlayerClient pc)

Constructor for LimbInterface.

Parameters:

pc - a reference to the PlayerClient object

Method Detail

readData

public void readData(PlayerMsgHdr header)

Read the Limb data.

Overrides:

readData in class PlayerDevice

homeCmd

public void homeCmd()

Command: home (PLAYER_LIMB_HOME_CMD)

Tells the end effector to return to its home position.

stopCmd

public void stopCmd()

Command: stop (PLAYER_LIMB_STOP_CMD)

Tells the limb to stop moving immediatly.

setPose

public void setPose(PlayerPoint3d position,
                    PlayerPoint3d approach,
                    PlayerPoint3d orientation)

Command: Set end effector pose (PLAYER_LIMB_SETPOSE_CMD).

Provides a fully-described pose (position, normal vector and orientation vector) for the end effector to move to.

Parameters:

position - Position of the end effector

approach - Approach vector

orientation - Orientation vector

setPosition

public void setPosition(PlayerPoint3d position)

Command: Set end effector position (PLAYER_LIMB_SETPOSITION_CMD).

Set the position of the end effector without worrying about a specific orientation.

Parameters:

position - Position of the end effector

vectorMove

public void vectorMove(PlayerPoint3d direction,
                       float length)

Command: Vector move the end effector (PLAYER_LIMB_VECMOVE_CMD).

Set the position of the end effector without worrying about a specific orientation.

Parameters:

direction - Direction vector to move in

length - Distance to move

setPower

public void setPower(int value)

Request/reply: Power.

Turn the power to the limb by sending a PLAYER_LIMB_POWER_REQ request. Be careful when turning power on that the limb is not obstructed from its home position in case it moves to it (common behaviour). Null response.

Parameters:

value - Power setting; 0 for off, 1 for on.

setBrakes

public void setBrakes(int value)

Request/reply: Brakes.

Turn the brakes of the limb on or off by sending a PLAYER_LIMB_BRAKES_REQ request. Null response.

Parameters:

value - Brakes setting; 0 for off, 1 for on.

queryGeometry

public void queryGeometry()

Request/reply: Query geometry.

Send a null PLAYER_LIMB_GEOM_REQ request to receive the geometry in this form.

setSpeed

public void setSpeed(float speed)

Request/reply: Speed.

Set the speed of the end effector for all subsequent movements by sending a PLAYER_LIMB_SPEED_REQ request. Null response.

Parameters:

speed - speed setting in m/s

handleResponse

protected void handleResponse(PlayerMsgHdr header)

Handle acknowledgement response messages.

Overrides:

handleResponse in class PlayerDevice

Parameters:

header - Player header

getData

public PlayerLimbData getData()

Get the Limb data.

Returns:

an object of type PlayerLimbData containing the requested data

getGeom

public PlayerLimbGeomReq getGeom()

Get the geometry data.

Returns:

an object of type PlayerLimbGeomReq containing the requested data

isDataReady

public boolean isDataReady()

Check if data is available.

Returns:

true if ready, false if not ready

isGeomReady

public boolean isGeomReady()

Check if geometry data is available.

Returns:

true if ready, false if not ready