'Displays all connections in this region.
If a connection ID is provided, the call returns only that
particular connection.
:type connection_id: string
:param connection_id: ID of the connection.
Example: dxcon-fg5678gh
Default: None'

def describe_connections(self, connection_id=None):

    params = {}
    if (connection_id is not None):
        params['connectionId'] = connection_id
    return self.make_request(action='DescribeConnections', body=json.dumps(params))
