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iothub_client_sample.py
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#!/usr/bin/env python
# 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 *
from iothub_client_args import *
# 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
receive_context = 0
avg_wind_speed = 10.0
message_count = 5
received_count = 0
# global counters
receive_callbacks = 0
send_callbacks = 0
# chose HTTP, AMQP or MQTT as transport protocol
protocol = IoTHubTransportProvider.AMQP
# String containing Hostname, Device Id & Device Key in the format:
# "HostName=<host_name>;DeviceId=<device_id>;SharedAccessKey=<device_key>"
connection_string = "[device connection string]"
msg_txt = "{\"deviceId\": \"myPythonDevice\",\"windSpeed\": %.2f}"
# some embedded platforms need certificate information
def set_certificates(iotHubClient):
from iothub_client_cert import certificates
try:
iotHubClient.set_option("TrustedCerts", certificates)
print("set_option TrustedCerts successful")
except IoTHubClientError as e:
print("set_option TrustedCerts failed (%s)" % e)
def receive_message_callback(message, counter):
global receive_callbacks
buffer = message.get_bytearray()
size = len(buffer)
print("Received Message [%d]:" % counter)
print(" Data: <<<%s>>> & Size=%d" %
(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
iotHubClient = IoTHubClient(connection_string, protocol)
if iotHubClient.protocol == IoTHubTransportProvider.HTTP:
iotHubClient.set_option("timeout", timeout)
iotHubClient.set_option("MinimumPollingTime", minimum_polling_time)
# some embedded platforms need certificate information
# set_certificates(iotHubClient)
# to enable MQTT logging set to 1
if iotHubClient.protocol == IoTHubTransportProvider.MQTT:
iotHubClient.set_option("logtrace", 0)
iotHubClient.set_message_callback(
receive_message_callback, receive_context)
return iotHubClient
def print_last_message_time(iotHubClient):
try:
last_message = iotHubClient.get_last_message_receive_time()
print("Last Message: %s" % time.asctime(time.localtime(last_message)))
print("Actual time : %s" % time.asctime())
except IoTHubClientError as e:
if (e.args[0].result == IoTHubClientResult.INDEFINITE_TIME):
print("No message received")
else:
print(e)
def iothub_client_sample_run():
try:
iotHubClient = iothub_client_init()
while True:
# send a few messages every minute
print("IoTHubClient sending %d messages" % message_count)
for i in range(0, message_count):
msg_txt_formatted = msg_txt % (
avg_wind_speed + (random.random() * 4 + 2))
# messages can be encoded as string or bytearray
if (i & 1) == 1:
message = IoTHubMessage(
bytearray(msg_txt_formatted, 'utf8'))
else:
message = IoTHubMessage(msg_txt_formatted)
# optional: assign ids
message.message_id = "message_%d" % i
message.correlation_id = "correlation_%d" % i
# optional: assign properties
prop_map = message.properties()
prop_text = "PropMsg_%d" % i
prop_map.add("Property", prop_text)
iotHubClient.send_event_async(
message, send_confirmation_callback, i)
print(
"IoTHubClient.send_event_async accepted message [%d]"
" for transmission to IoT Hub." %
i)
# Wait for Commands or exit
print("IoTHubClient waiting for commands, press Ctrl-C to exit")
n = 0
while n < 6:
status = iotHubClient.get_send_status()
print("Send status: %s" % status)
time.sleep(10)
n += 1
except IoTHubError as e:
print("Unexpected error %s from IoTHub" % e)
return
except KeyboardInterrupt:
print("IoTHubClient sample stopped")
print_last_message_time(iotHubClient)
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 o:
print(o)
usage()
sys.exit(1)
print("Starting the IoT Hub Python sample...")
print(" Protocol %s" % protocol)
print(" Connection string=%s" % connection_string)
iothub_client_sample_run()