Robotiq2FGripperSimpleController.py

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#!/usr/bin/env python

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"""@package docstring
Command-line interface for sending simple commands to a ROS node controlling a 2F gripper.

This serves as an example for publishing messages on the 'Robotiq2FGripperRobotOutput' topic using the 'Robotiq2FGripper_robot_output' msg type for sending commands to a 2F gripper.
"""

import roslib; roslib.load_manifest('robotiq_2f_gripper_control')
import rospy
from robotiq_2f_gripper_control.msg import _Robotiq2FGripper_robot_output  as outputMsg
from time import sleep


def genCommand(char, command):
    """Update the command according to the character entered by the user."""    
        
    if char == 'a':
        command = outputMsg.Robotiq2FGripper_robot_output();
        command.rACT = 1
        command.rGTO = 1
        command.rSP  = 255
        command.rFR  = 150

    if char == 'r':
        command = outputMsg.Robotiq2FGripper_robot_output();
        command.rACT = 0

    if char == 'c':
        command.rPR = 255

    if char == 'o':
        command.rPR = 0   

    #If the command entered is a int, assign this value to rPRA
    try: 
        command.rPR = int(char)
        if command.rPR > 255:
            command.rPR = 255
        if command.rPR < 0:
            command.rPR = 0
    except ValueError:
        pass                    
        
    if char == 'f':
        command.rSP += 25
        if command.rSP > 255:
            command.rSP = 255
            
    if char == 'l':
        command.rSP -= 25
        if command.rSP < 0:
            command.rSP = 0

            
    if char == 'i':
        command.rFR += 25
        if command.rFR > 255:
            command.rFR = 255
            
    if char == 'd':
        command.rFR -= 25
        if command.rFR < 0:
            command.rFR = 0

    return command
        

def askForCommand(command):
    """Ask the user for a command to send to the gripper."""    

    currentCommand  = 'Simple 2F Gripper Controller\n-----\nCurrent command:'
    currentCommand += '  rACT = '  + str(command.rACT)
    currentCommand += ', rGTO = '  + str(command.rGTO)
    currentCommand += ', rATR = '  + str(command.rATR)
    currentCommand += ', rPR = '   + str(command.rPR )
    currentCommand += ', rSP = '   + str(command.rSP )
    currentCommand += ', rFR = '   + str(command.rFR )


    print currentCommand

    strAskForCommand  = '-----\nAvailable commands\n\n'
    strAskForCommand += 'r: Reset\n'
    strAskForCommand += 'a: Activate\n'
    strAskForCommand += 'c: Close\n'
    strAskForCommand += 'o: Open\n'
    strAskForCommand += '(0-255): Go to that position\n'
    strAskForCommand += 'f: Faster\n'
    strAskForCommand += 'l: Slower\n'
    strAskForCommand += 'i: Increase force\n'
    strAskForCommand += 'd: Decrease force\n'
    
    strAskForCommand += '-->'

    return raw_input(strAskForCommand)

def publisher():
    """Main loop which requests new commands and publish them on the Robotiq2FGripperRobotOutput topic."""
    rospy.init_node('Robotiq2FGripperSimpleController')
    
    pub = rospy.Publisher('Robotiq2FGripperRobotOutput', outputMsg.Robotiq2FGripper_robot_output)

    command = outputMsg.Robotiq2FGripper_robot_output();

    while not rospy.is_shutdown():

        command = genCommand(askForCommand(command), command)            
        
        pub.publish(command)

        rospy.sleep(0.1)
                        

if __name__ == '__main__':
    publisher()