在AWS IoT Core中，当设备或客户端发送大量消息或连接尝试时，可能会出现限流情况，即AWS IoT Core将拒绝进一步的消息或连接请求，以保护其服务的稳定性。为了更好地了解这种情况，可以使用AWS IoT Core的限流指示功能。

限流指示功能可以告知您当前是否遇到限流情况，以及限流是否会影响您的设备。为了使用限流指示，您需要为您的设备配置设备定义，并使用AWS IoT SDK将设备连接到AWS IoT Core。

以下是使用AWS IoT SDK for Python的示例代码，该代码演示如何获取限流指示：

import boto3
from botocore.exceptions import EndpointConnectionError

# Create an IoT client
iot_client = boto3.client('iot')

# Get the current throttling state
try:
    response = iot_client.get_indexing_configuration()
    if 'thingIndexingConfiguration' in response:
        thing_config = response['thingIndexingConfiguration']
        if thing_config['thingConnectivityIndexingMode'] == 'OFF':
            print('Indexing is disabled for connectivity information for Things.')
        else:
            if thing_config['thingConnectivityIndexingMode'] == 'STATUS':
                print('Status is indexing for connectivity information for Things.')
            else:
                if thing_config['thingConnectivityIndexingMode'] == 'BATCH':
                    print('Batch is indexing for connectivity information for Things.')
    if 'thingGroupIndexingConfiguration' in response:
        group_config = response['thingGroupIndexingConfiguration']
        if group_config['thingGroupIndexingMode'] == 'OFF':
            print('Indexing is disabled for Thing Groups.')
        else:
            if group_config['thingGroupIndexingMode'] == 'STATUS':
                print('Status is indexing for Thing Groups.')
            else:
                if group_config['thingGroupIndexingMode'] == 'BATCH':
                    print('Batch is indexing for Thing Groups.')
except EndpointConnectionError as e:
    print('Could not connect to the endpoint:', e)

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