Request/cancel request real-time position data for all accounts.

def requestPositionUpdates(self, subscribe=True):
        """ Request/cancel request real-time position data for all accounts. """
        if self.subscribePositions != subscribe:
            self.subscribePositions = subscribe
            if subscribe == True:
                self.ibConn.reqPositions()
            else:
                self.ibConn.cancelPositions()