async def main():
# Get a sastoken you generated
sastoken = get_new_sastoken()
# The client object is used to interact with your Azure IoT hub.
device_client = IoTHubDeviceClient.create_from_sastoken(sastoken)
# connect the client.
await device_client.connect()
# define behavior for receiving a message
# NOTE: this could be a function or a coroutine
def message_received_handler(message):
print("the data in the message received was ")
print(message.data)
print("custom properties are")
print(message.custom_properties)
print("content Type: {0}".format(message.content_type))
print("")
# set the mesage received handler on the client
device_client.on_message_received = message_received_handler
# define behavior for halting the application
def stdin_listener():
while True:
selection = input("Press Q to quit\n")
if selection == "Q" or selection == "q":
print("Quitting...")
break
# define behavior for providing new sastokens to prevent expiry
async def sastoken_keepalive():
while True:
await asyncio.sleep(NEW_TOKEN_INTERVAL)
sastoken = get_new_sastoken()
await device_client.update_sastoken(sastoken)
# Run the stdin listener in the event loop
loop = asyncio.get_running_loop()
user_finished = loop.run_in_executor(None, stdin_listener)
# Also run the sastoken keepalive in the event loop
keepalive_task = asyncio.create_task(sastoken_keepalive())
# Wait for user to indicate they are done listening for messages
await user_finished
# Cancel the sastoken update task
keepalive_task.cancel()
# Finally, disconnect
await device_client.disconnect()
async def main():
# Get a sastoken you generated
sastoken = get_new_sastoken()
# The client object is used to interact with your Azure IoT hub.
device_client = IoTHubDeviceClient.create_from_sastoken(sastoken)
# connect the client.
await device_client.connect()
# define behavior for receiving a message
# NOTE: this could be a function or a coroutine
def message_received_handler(message):
print("the data in the message received was ")
print(message.data)
print("custom properties are")
print(message.custom_properties)
print("content Type: {0}".format(message.content_type))
print("")
# define behavior for updating sastoken
async def sastoken_update_handler():
print("Updating SAS Token...")
sastoken = get_new_sastoken()
await device_client.update_sastoken(sastoken)
print("SAS Token updated")
# set the message received handler on the client
device_client.on_message_received = message_received_handler
# set the sastoken update handler on the client
device_client.on_new_sastoken_required = sastoken_update_handler
# define behavior for halting the application
def stdin_listener():
while True:
selection = input("Press Q to quit\n")
if selection == "Q" or selection == "q":
print("Quitting...")
break
# Run the stdin listener in the event loop
loop = asyncio.get_running_loop()
user_finished = loop.run_in_executor(None, stdin_listener)
# Wait for user to indicate they are done listening for messages
await user_finished
# Finally, shut down the client
await device_client.shutdown()