[英]Cant publish to aws mqtt broker over websockets
我正在關注aws api通過 websockets 連接到 mqtt。 下面是我的代碼:
credentials_provider = AwsCredentialsProvider.new_static(
access_key_id = auth_response_dictionary['user']['accessKeyId'],
secret_access_key = auth_response_dictionary['user']['secretKey'],
session_token = auth_response_dictionary['user']['sessionToken']
)
event_loop_group = io.EventLoopGroup(1)
host_resolver = io.DefaultHostResolver(event_loop_group)
client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)
mqtt_connection = mqtt_connection_builder.websockets_with_default_aws_signing(
endpoint=auth_response_dictionary['user']['iotEndpoint'],
region=auth_response_dictionary['user']['region'],
credentials_provider=credentials_provider,
client_bootstrap=client_bootstrap,
client_id=clientId
)
print("Connecting to aws")
# Make the connect() call
connect_future = mqtt_connection.connect()
# Future.result() waits until a result is available
print('connect_future ' + str(connect_future))
x= connect_future.result()
print('connect_future ' + str(x))
print("Connected!")
future, packet_id = mqtt_connection.publish(topic=TOPIC, payload=json.dumps(message), qos=mqtt.QoS.AT_LEAST_ONCE)
future, packet_id = mqtt_connection.publish(topic='test/po', payload=json.dumps(message), qos=mqtt.QoS.AT_LEAST_ONCE)
print('future ' + str(future))
print('future ' + str(packet_id))
print('Publish End')
我在連接和發布時沒有收到任何錯誤,但是當我在“測試”部分訂閱該主題時,我沒有在我的 aws mqtt 代理上收到任何消息。 我認為我在credentials_provider
或client_bootstrap
或兩者中配置了錯誤但不知道是什么。
這是打印的日志
Connecting to aws
connect_future<Future at 0x7f605f942af0 state=pending>
connect_future{'session_present': False}
Connected!
future <Future at 0x7f605f8e54f0 state=pending>
future 3
Publish End
有人可以幫忙嗎?
mqtt_connection.subscribe(...)
用於訂閱 AWS IoT 消息的 MQTT 主題,我在您的代碼中看不到它。
mqtt_connection.subscribe
的調用方式如下,接收主題名稱、服務質量級別和回調。
received_count = 0
received_all_event = threading.Event()
...
topic='test/po'
print("Subscribing to topic '{}'...".format(topic))
subscribe_future, packet_id = mqtt_connection.subscribe(
topic=topic,
qos=mqtt.QoS.AT_LEAST_ONCE,
callback=on_message_received)
subscribe_result = subscribe_future.result()
print("Subscribed with {}".format(str(subscribe_result['qos'])))
on_message_received
看起來像這樣:
def on_message_received(topic, payload, dup, qos, retain, **kwargs):
print("Received message from topic '{}': {}".format(topic, payload))
global received_count
received_count += 1
# Number of messages to wait for
if received_count = 10:
received_all_event.set()
然后在您的主要方法中,您可以等到收到 10 條消息:
# Wait for all messages to be received.
# This waits forever if count was set to 0.
if not received_all_event.is_set():
print("Waiting for all messages to be received...")
received_all_event.wait()
print("{} message(s) received.".format(received_count))
AWS 提供了非常好的示例代碼,我建議您檢查一下。
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