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iothub_client_sample_x509.py
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# Copyright (c) Microsoft. All rights reserved.
# Licensed under the MIT license. See LICENSE file in the project root for
# full license information.
import random
import time
import sys
import iothub_client
from iothub_client import IoTHubClient, IoTHubClientError, IoTHubTransportProvider, IoTHubClientResult
from iothub_client import IoTHubMessage, IoTHubMessageDispositionResult, IoTHubError
from iothub_client_args import get_iothub_opt, OptionError
# HTTP options
# Because it can poll "after 9 seconds" polls will happen effectively
# at ~10 seconds.
# Note that for scalabilty, the default value of minimumPollingTime
# is 25 minutes. For more information, see:
# https://azure.microsoft.com/documentation/articles/iot-hub-devguide/#messaging
TIMEOUT = 241000
MINIMUM_POLLING_TIME = 9
# messageTimeout - the maximum time in milliseconds until a message times out.
# The timeout period starts at IoTHubClient.send_event_async.
# By default, messages do not expire.
MESSAGE_TIMEOUT = 10000
RECEIVE_CONTEXT = 0
AVG_WIND_SPEED = 10.0
MIN_TEMPERATURE = 20.0
MIN_HUMIDITY = 60.0
MESSAGE_COUNT = 5
RECEIVED_COUNT = 0
# global counters
RECEIVE_CALLBACKS = 0
SEND_CALLBACKS = 0
PROTOCOL = IoTHubTransportProvider.HTTP
# String containing Hostname, Device Id in the format:
# "HostName=<host_name>;DeviceId=<device_id>;x509=true"
CONNECTION_STRING = "[Device Connection String]"
MSG_TXT = "{\"deviceId\": \"myPythonDevice\",\"windSpeed\": %.2f,\"temperature\": %.2f,\"humidity\": %.2f}"
X509_CERTIFICATE = (
"-----BEGIN CERTIFICATE-----"
"MIICpDCCAYwCCQCfIjBnPxs5TzANBgkqhkiG9w0BAQsFADAUMRIwEAYDVQQDDAls"
"b2NhbGhvc3QwHhcNMTYwNjIyMjM0MzI3WhcNMTYwNjIzMjM0MzI3WjAUMRIwEAYD"
"..."
"+s88wBF907s1dcY45vsG0ldE3f7Y6anGF60nUwYao/fN/eb5FT5EHANVMmnK8zZ2"
"tjWUt5TFnAveFoQWIoIbtzlTbOxUFwMrQFzFXOrZoDJmHNWc2u6FmVAkowoOSHiE"
"dkyVdoGPCXc="
"-----END CERTIFICATE-----"
)
X509_PRIVATEKEY = (
"-----BEGIN RSA PRIVATE KEY-----"
"MIIEpQIBAAKCAQEA0zKK+Uu5I0nXq2V6+2gbdCsBXZ6j1uAgU/clsCohEAek1T8v"
"qj2tR9Mz9iy9RtXPMHwzcQ7aXDaz7RbHdw7tYXqSw8iq0Mxq2s3p4mo6gd5vEOiN"
"..."
"EyePNmkCgYEAng+12qvs0de7OhkTjX9FLxluLWxfN2vbtQCWXslLCG+Es/ZzGlNF"
"SaqVID4EAUgUqFDw0UO6SKLT+HyFjOr5qdHkfAmRzwE/0RBN69g2qLDN3Km1Px/k"
"xyJyxc700uV1eKiCdRLRuCbUeecOSZreh8YRIQQXoG8uotO5IttdVRc="
"-----END RSA PRIVATE KEY-----"
)
# some embedded platforms need certificate information
def receive_message_callback(message, counter):
global RECEIVE_CALLBACKS
message_buffer = message.get_bytearray()
size = len(message_buffer)
print ( "Received Message [%d]:" % counter )
print ( " Data: <<<%s>>> & Size=%d" % (message_buffer[:size].decode('utf-8'), size) )
map_properties = message.properties()
key_value_pair = map_properties.get_internals()
print ( " Properties: %s" % key_value_pair )
counter += 1
RECEIVE_CALLBACKS += 1
print ( " Total calls received: %d" % RECEIVE_CALLBACKS )
return IoTHubMessageDispositionResult.ACCEPTED
def send_confirmation_callback(message, result, user_context):
global SEND_CALLBACKS
print ( "Confirmation[%d] received for message with result = %s" % (user_context, result) )
map_properties = message.properties()
print ( " message_id: %s" % message.message_id )
print ( " correlation_id: %s" % message.correlation_id )
key_value_pair = map_properties.get_internals()
print ( " Properties: %s" % key_value_pair )
SEND_CALLBACKS += 1
print ( " Total calls confirmed: %d" % SEND_CALLBACKS )
def iothub_client_init():
# prepare iothub client
client = IoTHubClient(CONNECTION_STRING, PROTOCOL)
# HTTP specific settings
if client.protocol == IoTHubTransportProvider.HTTP:
client.set_option("timeout", TIMEOUT)
client.set_option("MinimumPollingTime", MINIMUM_POLLING_TIME)
# set the time until a message times out
client.set_option("messageTimeout", MESSAGE_TIMEOUT)
# this brings in x509 privateKey and certificate
client.set_option("x509certificate", X509_CERTIFICATE)
client.set_option("x509privatekey", X509_PRIVATEKEY)
# to enable MQTT logging set to 1
if client.protocol == IoTHubTransportProvider.MQTT:
client.set_option("logtrace", 0)
client.set_message_callback(
receive_message_callback, RECEIVE_CONTEXT)
return client
def print_last_message_time(client):
try:
last_message = client.get_last_message_receive_time()
print ( "Last Message: %s" % time.asctime(time.localtime(last_message)) )
print ( "Actual time : %s" % time.asctime() )
except IoTHubClientError as iothub_client_error:
if iothub_client_error.args[0].result == IoTHubClientResult.INDEFINITE_TIME:
print ( "No message received" )
else:
print ( iothub_client_error )
def iothub_client_sample_x509_run():
try:
client = iothub_client_init()
while True:
# send a few messages every minute
print ( "IoTHubClient sending %d messages" % MESSAGE_COUNT )
for message_counter in range(0, MESSAGE_COUNT):
temperature = MIN_TEMPERATURE + (random.random() * 10)
humidity = MIN_HUMIDITY + (random.random() * 20)
msg_txt_formatted = MSG_TXT % (
AVG_WIND_SPEED + (random.random() * 4 + 2),
temperature,
humidity)
# messages can be encoded as string or bytearray
if (message_counter & 1) == 1:
message = IoTHubMessage(bytearray(msg_txt_formatted, 'utf8'))
else:
message = IoTHubMessage(msg_txt_formatted)
# optional: assign ids
message.message_id = "message_%d" % message_counter
message.correlation_id = "correlation_%d" % message_counter
# optional: assign properties
prop_map = message.properties()
prop_map.add("temperatureAlert", 'true' if temperature > 28 else 'false')
client.send_event_async(message, send_confirmation_callback, message_counter)
print ( "IoTHubClient.send_event_async accepted message [%d] for transmission to IoT Hub." % message_counter )
# Wait for Commands or exit
print ( "IoTHubClient waiting for commands, press Ctrl-C to exit" )
status_counter = 0
while status_counter <= MESSAGE_COUNT:
status = client.get_send_status()
print ( "Send status: %s" % status )
time.sleep(10)
status_counter += 1
except IoTHubError as iothub_error:
print ( "Unexpected error %s from IoTHub" % iothub_error )
return
except KeyboardInterrupt:
print ( "IoTHubClient sample stopped" )
print_last_message_time(client)
def usage():
print ( "Usage: iothub_client_sample.py -p <protocol> -c <connectionstring>" )
print ( " protocol : <amqp, http, mqtt>" )
print ( " connectionstring: <HostName=<host_name>;DeviceId=<device_id>;SharedAccessKey=<device_key>>" )
if __name__ == '__main__':
print ( "\nPython %s" % sys.version )
print ( "IoT Hub for Python SDK Version: %s" % iothub_client.__version__ )
try:
(CONNECTION_STRING, PROTOCOL) = get_iothub_opt(sys.argv[1:], CONNECTION_STRING, PROTOCOL)
except OptionError as option_error:
print ( option_error )
usage()
sys.exit(1)
print ( "Starting the IoT Hub Python sample..." )
print ( " Protocol %s" % PROTOCOL )
print ( " Connection string=%s" % CONNECTION_STRING )
iothub_client_sample_x509_run()