def start_gateway(GatewayARN=None):
    """
    Starts a gateway that you previously shut down (see  ShutdownGateway ). After the gateway starts, you can then make other API calls, your applications can read from or write to the gateway's storage volumes and you will be able to take snapshot backups.
    To specify which gateway to start, use the Amazon Resource Name (ARN) of the gateway in your request.
    See also: AWS API Documentation
    
    Examples
    Starts a gateway service that was previously shut down.
    Expected Output:
    
    :example: response = client.start_gateway(
        GatewayARN='string'
    )
    
    
    :type GatewayARN: string
    :param GatewayARN: [REQUIRED]
            The Amazon Resource Name (ARN) of the gateway. Use the ListGateways operation to return a list of gateways for your account and region.
            

    :rtype: dict
    :return: {
        'GatewayARN': 'string'
    }
    
    
    """
    pass
