Andreas Fendt created PROTON-2044:
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Summary: Azure IoT Hub local-idle-timeout expired
Key: PROTON-2044
URL: https://issues.apache.org/jira/browse/PROTON-2044
Project: Qpid Proton
Issue Type: Bug
Components: python-binding
Affects Versions: proton-c-0.24.0
Environment: Operating System: Windows
Python: 3.6.4
qpid-proton: 0.24.0
Reporter: Andreas Fendt
Fix For: proton-c-0.24.0
I'm using following python code to send messages to the devices which are
connected to the azure iot hub:
{code:java}
import json
from base64 import b64encode, b64decode
from hashlib import sha256
from hmac import HMAC
from time import time
from urllib.parse import quote_plus, urlencode
from proton import ProtonException, Message
from proton.utils import BlockingConnection
class IotHub:
def __init__(self):
self._hostname = f"example-hub.azure-devices.net"
self._username = f"[email protected]"
self._blocking_connection = None
self._sender = None
self.connect()
@staticmethod
def generate_sas_token(uri: str, policy: str, key: str, expiry: float =
None):
if not expiry:
expiry = time() + 3600 # Default to 1 hour.
encoded_uri = quote_plus(uri)
ttl = int(expiry)
sign_key = f"{encoded_uri}\n{ttl}"
signature = b64encode(HMAC(b64decode(key), sign_key.encode(),
sha256).digest())
result = {"sr": uri, "sig": signature, "se": str(ttl)}
if policy:
result["skn"] = policy
return f"SharedAccessSignature {urlencode(result)}"
def connect(self):
# create credentials
password = self.generate_sas_token(self._hostname,
"iothubowner", "key",
time() + 31557600) # ttl = 1 Year
# establish connection
self._blocking_connection =
BlockingConnection(f"amqps://{self._hostname}", allowed_mechs="PLAIN",
user=self._username,
password=password,
heartbeat=30)
self._sender =
self._blocking_connection.create_sender("/messages/devicebound")
def send(self, message: dict, serial_number: str):
"""
Send proton Message to AMQP queue
"""
message =
Message(address="/devices/{serial_number}/messages/devicebound".format(serial_number=serial_number),
body=bytes(json.dumps(message, separators=(",",
":")), "utf-8"))
message.inferred = True # disable message encoding
self._sender.send(message, timeout=20)
{code}
The problem is now that when I don't send any message for some seconds I get
following exepction while sending a message:
{code:java}
Connection amqps://example-hub.azure-devices.net:amqps disconnected:
Condition('amqp:resource-limit-exceeded', 'local-idle-timeout expired')
{code}
Whats the reason for that? How can I solve that?
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