Button bXMinus = (Button) findViewById(R.id.btnXMinus);
		bXMinus.setOnTouchListener(new OnTouchListener() {
		    @Override
		    public boolean onTouch(View v, MotionEvent event) {
		        if(event.getAction() == MotionEvent.ACTION_DOWN) {
		        	sendMessage("jog x -1");
		        } else if (event.getAction() == MotionEvent.ACTION_UP) {
		        	sendMessage("jog x 0");
		        }
		        return true;
		    }
		});