Forward device port to local
        Args:
            device_port: port inside device
            local_port: port on PC, if this value is None, a port will random pick one.

        Returns:
            tuple, (host, local_port)

def forward(self, device_port, local_port=None):
        """Forward device port to local
        Args:
            device_port: port inside device
            local_port: port on PC, if this value is None, a port will random pick one.

        Returns:
            tuple, (host, local_port)
        """
        port = self._adb_device.forward(device_port, local_port)
        return (self._host, port)