我正在嘗試使用 paho-mqtt 將資料框中的資料（最初在 txt 檔案中）發布到 AWS IoT Core。我的發布腳本設定如下：
# paho mqtt
import paho.mqtt.client as mqtt
clientID = "iotconsole-somenumber-0"
broker = "alphanumeric-ats.iot.us-west-1.amazonaws.com"
port = 8883
pub = mqtt.Client(clientID)
pub.tls_set("certs/AmazonRootCA1.pem", certfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt", keyfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_private.pem.key")
pub.connect(broker, port)
pub.publish("awsiot_test", dataframe, qos = 1)
但是，當我運行此腳本時，出現以下錯誤。我認為我的東西證書做錯了。但不能歸零。
File ~\PyProj\projfolder\code.py:9 in <module>
pub.tls_set("certs/AmazonRootCA1.pem", certfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt", keyfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_private.pem.key")
File ~\anaconda3\lib\site-packages\paho\mqtt\client.py:796 in tls_set
context.load_cert_chain(certfile, keyfile, keyfile_password)
FileNotFoundError: [Errno 2] No such file or directory
我認為這是一個證書檔案 -/_ 問題或擴展問題。但是，還沒有找到解決辦法。我該如何解決？謝謝！
uj5u.com熱心網友回復：
根據評論，您看到的錯誤是由呼叫觸發的，context.load_cert_chain(certfile, keyfile, keyfile_password);并表明其中一個檔案（certs/AmazonRootCA1.pem和/或certs/a0c9496....afd4f67f_certificate.pem.crt）不存在（這可能與權限相關）。
為了幫助顯示最可能的原因，我復制并運行了您的代碼，結果相同：
python3 app.py
Traceback (most recent call last):
File "/workspaces/test/app.py", line 9, in <module>
pub.tls_set("certs/AmazonRootCA1.pem", certfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt", keyfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_private.pem.key")
File "/usr/local/pip-global/paho/mqtt/client.py", line 796, in tls_set
context.load_cert_chain(certfile, keyfile, keyfile_password)
FileNotFoundError: [Errno 2] No such file or directory
然后我創建了證書檔案：
mkdir certs
touch certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt
并再次運行應用程式（不做其他更改）：
python3 app.py
Traceback (most recent call last):
File "/workspaces/test/app.py", line 9, in <module>
pub.tls_set("certs/AmazonRootCA1.pem", certfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt", keyfile = "certs/a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_private.pem.key")
File "/usr/local/pip-global/paho/mqtt/client.py", line 796, in tls_set
context.load_cert_chain(certfile, keyfile, keyfile_password)
ssl.SSLError: [SSL] PEM lib (_ssl.c:4044)
您會注意到現在有一??個不同的錯誤（證書現在存在但不是有效的證書）。添加有效crt檔案將導致No such file or directory錯誤再次出現（由于嘗試加載密鑰檔案）。
為了完成示例，我生成了一個測驗證書并將證書放入AmazonRootCA1.pem和a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_certificate.pem.crt密鑰a0c94969f1e7d914d6fe54425d772e8d4611a4710d460e9f56374ea0afd4f67f_private.pem.key中并運行應用程式：
python3 app.py
Traceback (most recent call last):
File "/workspaces/test/app.py", line 10, in <module>
pub.connect(broker, port)
File "/usr/local/pip-global/paho/mqtt/client.py", line 914, in connect
return self.reconnect()
File "/usr/local/pip-global/paho/mqtt/client.py", line 1044, in reconnect
sock = self._create_socket_connection()
File "/usr/local/pip-global/paho/mqtt/client.py", line 3685, in _create_socket_connection
return socket.create_connection(addr, timeout=self._connect_timeout, source_address=source)
File "/usr/local/lib/python3.9/socket.py", line 823, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
File "/usr/local/lib/python3.9/socket.py", line 954, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
這表明擁有有效的證書/密鑰可以導致功能成功完成（它現在正在嘗試連接到alphanumeric-ats.iot.us-west-1.amazonaws.com哪個會失敗）。
您的問題沒有提供足夠的資訊來進行任何進一步的調查；如果您仍然遇到問題，請嘗試復制上述程序，這很可能有助于找到原因。
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標籤：亚马逊网络服务 ssl MQTT aws-物联网 帕霍