Adding a key to keyboard node found here code.ros.org/trac/wg-ros-pkg/browser/trunk/pr2/teleop/teleop_pr2/teleop_pr2_keyboard.cpp?rev=24912 [closed]

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Hi everybody I am referring to the telop_pr2_keyboard node and specifically to teleop_pr2_keyboard.cpp file (link in title). Can you please tell me what needs to be added in this code so that (in addition to moving the robot using the key A D S W Q E), to add another key so that when it is pressed to switch on a device connected to the modbus_io and when pressed again to switch it off. If anybody can help please drop me a line. Thank you George