def connect(self, transport_type, connection_string, cert):
print("connecting using " + transport_type)
auth_provider = auth.from_connection_string(connection_string)
if "GatewayHostName" in connection_string:
auth_provider.ca_cert = cert
self.client = IoTHubDeviceClient.from_authentication_provider(
auth_provider, transport_type)
async_helper.run_coroutine_sync(self.client.connect())
async def create_symmetric_key_auth_provider():
"""
This creates an authentication provider from the connection string of the device or module
"""
key_auth_provider = auth.from_connection_string(
os.getenv("IOTHUB_DEVICE_CONNECTION_STRING"))
device_client_key = IoTHubDeviceClient.from_authentication_provider(
key_auth_provider, "mqtt")
print("Authenticating with Device Connection String...")
await device_client_key.connect()
print("Successfully authenticated!")
async def create_shared_access_sig_auth_provider():
"""
This creates an authentication provider from the pre-generated shared access signature of the device or module
"""
sas_auth_provider = auth.from_shared_access_signature(
os.getenv("IOTHUB_DEVICE_SAS_STRING"))
device_client_sas = IoTHubDeviceClient.from_authentication_provider(
sas_auth_provider, "mqtt")
print("Authenticating with SharedAccessSignature string...")
await device_client_sas.connect()
print("Successfully authenticated!")
async def main():
# The connection string for a device should never be stored in code. For the sake of simplicity we're using an environment variable here.
conn_str = os.getenv("IOTHUB_DEVICE_CONNECTION_STRING")
# The "Authentication Provider" is the object in charge of creating authentication "tokens" for the device client.
auth_provider = auth.from_connection_string(conn_str)
# For now, the SDK only supports MQTT as a protocol. the client object is used to interact with your Azure IoT hub.
# It needs an Authentication Provider to secure the communication with the hub, using either tokens or x509 certificates
device_client = IoTHubDeviceClient.from_authentication_provider(
auth_provider, "mqtt")
# connect the client.
await device_client.connect()
# define behavior for receiving a C2D message
async def c2d_listener(device_client):
while True:
c2d_message = await device_client.receive_c2d_message(
) # blocking call
print("the data in the message received was ")
print(c2d_message.data)
print("custom properties are")
print(c2d_message.custom_properties)
# 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
# Schedule task for C2D Listener
asyncio.create_task(c2d_listener(device_client))
# 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, disconnect
await device_client.disconnect()
async def main():
# The connection string for a device should never be stored in code. For the sake of simplicity we're using an environment variable here.
conn_str = os.getenv("IOTHUB_DEVICE_CONNECTION_STRING")
# The "Authentication Provider" is the object in charge of creating authentication "tokens" for the device client.
auth_provider = auth.from_connection_string(conn_str)
# For now, the SDK only supports MQTT as a protocol. the client object is used to interact with your Azure IoT hub.
# It needs an Authentication Provider to secure the communication with the hub, using either tokens or x509 certificates
device_client = IoTHubDeviceClient.from_authentication_provider(
auth_provider, "mqtt")
# connect the client.
await device_client.connect()
# define behavior for handling methods
async def method1_listener(device_client):
while True:
method_request = await device_client.receive_method_request(
"method1") # Wait for method1 calls
payload = {
"result": True,
"data": "some data"
} # set response payload
status = 200 # set return status code
print("executed method1")
method_response = MethodResponse.create_from_method_request(
method_request, status, payload)
await device_client.send_method_response(method_response
) # send response
async def method2_listener(device_client):
while True:
method_request = await device_client.receive_method_request(
"method2") # Wait for method2 calls
payload = {"result": True, "data": 1234} # set response payload
status = 200 # set return status code
print("executed method2")
method_response = MethodResponse.create_from_method_request(
method_request, status, payload)
await device_client.send_method_response(method_response
) # send response
async def generic_method_listener(device_client):
while True:
method_request = (await device_client.receive_method_request()
) # Wait for unknown method calls
payload = {
"result": False,
"data": "unknown method"
} # set response payload
status = 400 # set return status code
print("executed unknown method: " + method_request.name)
method_response = MethodResponse.create_from_method_request(
method_request, status, payload)
await device_client.send_method_response(method_response
) # send response
# 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
# Schedule tasks for Method Listener
listeners = asyncio.gather(
method1_listener(device_client),
method2_listener(device_client),
generic_method_listener(device_client),
)
# 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 method calls
await user_finished
# Cancel listening
listeners.cancel()
# Finally, disconnect
await device_client.disconnect()
