class Test (PositionerBase):
    def __init__(self, name):        
         PositionerBase.__init__(self, name, PositionerConfig())
         self.rbk = 0.0
         self.stp = 0.0
         self.moving = False
                  
    def doRead(self):
        return self.stp

    def doWrite(self, value): 
        if value!=self.stp:
            self.stp=value
            self.moving = True
        
    def doReadReadback(self): 
        if self.moving:
            off = self.stp - self.rbk
            if abs(off)<=1:
                self.rbk = self.stp
                self.moving = False
            else:
                self.rbk = self.rbk +1.0 if  (self.stp > self.rbk) else  self.rbk -1.0 
        return self.rbk

add_device(Test("test_positioner"), True)
test_positioner.polling=1000