Azure IoT / Mbed 2 deprecated iothub_client_sample_http

IoTHub raw messaging sample using HTTP

Dependencies:   iothub_client EthernetInterface iothub_http_transport mbed-rtos mbed wolfSSL azure_c_shared_utility NTPClient

This sample showcases the usage of Azure IoT client libraries with the HTTP transport for sending/receiving raw messages from an IoT Hub.

iothub_client_sample_http.c@33:f8eb46ca453d, 2016-03-11 (annotated)

Committer:
Azure.IoT Build
Date:
Fri Mar 11 17:03:09 2016 -0800
Revision:
33:f8eb46ca453d
Parent:
20:52f8298d7256
Child:
38:eb426458564b
1.0.2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AzureIoTClient 18:e3e29fc771c9 1 // Copyright (c) Microsoft. All rights reserved.
AzureIoTClient 18:e3e29fc771c9 2 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
AzureIoTClient 18:e3e29fc771c9 3
AzureIoTClient 18:e3e29fc771c9 4 #include <stdio.h>
AzureIoTClient 18:e3e29fc771c9 5 #include <stdlib.h>
AzureIoTClient 18:e3e29fc771c9 6
AzureIoTClient 18:e3e29fc771c9 7 /* This sample uses the _LL APIs of iothub_client for example purposes.
AzureIoTClient 18:e3e29fc771c9 8 That does not mean that HTTP only works with the _LL APIs.
AzureIoTClient 18:e3e29fc771c9 9 Simply changing the using the convenience layer (functions not having _LL)
AzureIoTClient 18:e3e29fc771c9 10 and removing calls to _DoWork will yield the same results. */
AzureIoTClient 18:e3e29fc771c9 11
AzureIoTClient 20:52f8298d7256 12 #ifdef ARDUINO
AzureIoTClient 20:52f8298d7256 13 #include "AzureIoT.h"
AzureIoTClient 20:52f8298d7256 14 #else
AzureIoTClient 18:e3e29fc771c9 15 #include "iothub_client_ll.h"
AzureIoTClient 18:e3e29fc771c9 16 #include "iothub_message.h"
AzureIoTClient 18:e3e29fc771c9 17 #include "crt_abstractions.h"
AzureIoTClient 18:e3e29fc771c9 18 #include "iothubtransporthttp.h"
Azure.IoT Build 33:f8eb46ca453d 19 #include "platform.h"
AzureIoTClient 20:52f8298d7256 20 #endif
AzureIoTClient 18:e3e29fc771c9 21
AzureIoTClient 18:e3e29fc771c9 22 #ifdef MBED_BUILD_TIMESTAMP
AzureIoTClient 18:e3e29fc771c9 23 #include "certs.h"
AzureIoTClient 18:e3e29fc771c9 24 #endif // MBED_BUILD_TIMESTAMP
AzureIoTClient 18:e3e29fc771c9 25
AzureIoTClient 20:52f8298d7256 26 /*String containing Hostname, Device Id & Device Key in the format: */
AzureIoTClient 20:52f8298d7256 27 /* "HostName=<host_name>;DeviceId=<device_id>;SharedAccessKey=<device_key>" */
AzureIoTClient 18:e3e29fc771c9 28 static const char* connectionString = "[device connection string]";
AzureIoTClient 18:e3e29fc771c9 29 static int callbackCounter;
AzureIoTClient 18:e3e29fc771c9 30
AzureIoTClient 18:e3e29fc771c9 31 DEFINE_ENUM_STRINGS(IOTHUB_CLIENT_CONFIRMATION_RESULT, IOTHUB_CLIENT_CONFIRMATION_RESULT_VALUES);
AzureIoTClient 18:e3e29fc771c9 32
AzureIoTClient 18:e3e29fc771c9 33 typedef struct EVENT_INSTANCE_TAG
AzureIoTClient 18:e3e29fc771c9 34 {
AzureIoTClient 18:e3e29fc771c9 35 IOTHUB_MESSAGE_HANDLE messageHandle;
AzureIoTClient 18:e3e29fc771c9 36 int messageTrackingId; // For tracking the messages within the user callback.
AzureIoTClient 18:e3e29fc771c9 37 } EVENT_INSTANCE;
AzureIoTClient 18:e3e29fc771c9 38
AzureIoTClient 18:e3e29fc771c9 39 static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback)
AzureIoTClient 18:e3e29fc771c9 40 {
AzureIoTClient 18:e3e29fc771c9 41 int* counter = (int*)userContextCallback;
AzureIoTClient 18:e3e29fc771c9 42 const char* buffer;
AzureIoTClient 18:e3e29fc771c9 43 size_t size;
AzureIoTClient 20:52f8298d7256 44 MAP_HANDLE mapProperties;
AzureIoTClient 20:52f8298d7256 45
AzureIoTClient 18:e3e29fc771c9 46 if (IoTHubMessage_GetByteArray(message, (const unsigned char**)&buffer, &size) != IOTHUB_MESSAGE_OK)
AzureIoTClient 18:e3e29fc771c9 47 {
AzureIoTClient 18:e3e29fc771c9 48 printf("unable to retrieve the message data\r\n");
AzureIoTClient 18:e3e29fc771c9 49 }
AzureIoTClient 18:e3e29fc771c9 50 else
AzureIoTClient 18:e3e29fc771c9 51 {
AzureIoTClient 18:e3e29fc771c9 52 (void)printf("Received Message [%d] with Data: <<<%.*s>>> & Size=%d\r\n", *counter, (int)size, buffer, (int)size);
AzureIoTClient 18:e3e29fc771c9 53 }
AzureIoTClient 18:e3e29fc771c9 54
AzureIoTClient 18:e3e29fc771c9 55 // Retrieve properties from the message
AzureIoTClient 20:52f8298d7256 56 mapProperties = IoTHubMessage_Properties(message);
AzureIoTClient 18:e3e29fc771c9 57 if (mapProperties != NULL)
AzureIoTClient 18:e3e29fc771c9 58 {
AzureIoTClient 18:e3e29fc771c9 59 const char*const* keys;
AzureIoTClient 18:e3e29fc771c9 60 const char*const* values;
AzureIoTClient 18:e3e29fc771c9 61 size_t propertyCount = 0;
AzureIoTClient 18:e3e29fc771c9 62 if (Map_GetInternals(mapProperties, &keys, &values, &propertyCount) == MAP_OK)
AzureIoTClient 18:e3e29fc771c9 63 {
AzureIoTClient 18:e3e29fc771c9 64 if (propertyCount > 0)
AzureIoTClient 18:e3e29fc771c9 65 {
AzureIoTClient 20:52f8298d7256 66 size_t index;
AzureIoTClient 20:52f8298d7256 67
AzureIoTClient 18:e3e29fc771c9 68 printf("Message Properties:\r\n");
AzureIoTClient 20:52f8298d7256 69 for (index = 0; index < propertyCount; index++)
AzureIoTClient 18:e3e29fc771c9 70 {
AzureIoTClient 18:e3e29fc771c9 71 printf("\tKey: %s Value: %s\r\n", keys[index], values[index]);
AzureIoTClient 18:e3e29fc771c9 72 }
AzureIoTClient 18:e3e29fc771c9 73 printf("\r\n");
AzureIoTClient 18:e3e29fc771c9 74 }
AzureIoTClient 18:e3e29fc771c9 75 }
AzureIoTClient 18:e3e29fc771c9 76 }
AzureIoTClient 18:e3e29fc771c9 77
AzureIoTClient 18:e3e29fc771c9 78 /* Some device specific action code goes here... */
AzureIoTClient 18:e3e29fc771c9 79 (*counter)++;
AzureIoTClient 18:e3e29fc771c9 80 return IOTHUBMESSAGE_ACCEPTED;
AzureIoTClient 18:e3e29fc771c9 81 }
AzureIoTClient 18:e3e29fc771c9 82
AzureIoTClient 18:e3e29fc771c9 83 static void SendConfirmationCallback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void* userContextCallback)
AzureIoTClient 18:e3e29fc771c9 84 {
AzureIoTClient 18:e3e29fc771c9 85 EVENT_INSTANCE* eventInstance = (EVENT_INSTANCE*)userContextCallback;
AzureIoTClient 18:e3e29fc771c9 86 (void)printf("Confirmation[%d] received for message tracking id = %d with result = %s\r\n", callbackCounter, eventInstance->messageTrackingId, ENUM_TO_STRING(IOTHUB_CLIENT_CONFIRMATION_RESULT, result));
AzureIoTClient 18:e3e29fc771c9 87 /* Some device specific action code goes here... */
AzureIoTClient 18:e3e29fc771c9 88 callbackCounter++;
AzureIoTClient 18:e3e29fc771c9 89 IoTHubMessage_Destroy(eventInstance->messageHandle);
AzureIoTClient 18:e3e29fc771c9 90 }
AzureIoTClient 18:e3e29fc771c9 91
AzureIoTClient 18:e3e29fc771c9 92 static char msgText[1024];
AzureIoTClient 18:e3e29fc771c9 93 static char propText[1024];
AzureIoTClient 18:e3e29fc771c9 94 #define MESSAGE_COUNT 5
AzureIoTClient 18:e3e29fc771c9 95
AzureIoTClient 18:e3e29fc771c9 96 void iothub_client_sample_http_run(void)
AzureIoTClient 18:e3e29fc771c9 97 {
AzureIoTClient 18:e3e29fc771c9 98 IOTHUB_CLIENT_LL_HANDLE iotHubClientHandle;
AzureIoTClient 18:e3e29fc771c9 99
AzureIoTClient 18:e3e29fc771c9 100 EVENT_INSTANCE messages[MESSAGE_COUNT];
AzureIoTClient 20:52f8298d7256 101 double avgWindSpeed = 10.0;
AzureIoTClient 20:52f8298d7256 102 int receiveContext = 0;
AzureIoTClient 18:e3e29fc771c9 103
AzureIoTClient 18:e3e29fc771c9 104 srand((unsigned int)time(NULL));
AzureIoTClient 18:e3e29fc771c9 105
AzureIoTClient 18:e3e29fc771c9 106 callbackCounter = 0;
AzureIoTClient 18:e3e29fc771c9 107
Azure.IoT Build 33:f8eb46ca453d 108 if (platform_init() != 0)
AzureIoTClient 18:e3e29fc771c9 109 {
Azure.IoT Build 33:f8eb46ca453d 110 printf("Failed to initialize the platform.\r\n");
AzureIoTClient 18:e3e29fc771c9 111 }
AzureIoTClient 18:e3e29fc771c9 112 else
AzureIoTClient 18:e3e29fc771c9 113 {
Azure.IoT Build 33:f8eb46ca453d 114 (void)printf("Starting the IoTHub client sample HTTP...\r\n");
AzureIoTClient 18:e3e29fc771c9 115
Azure.IoT Build 33:f8eb46ca453d 116 if ((iotHubClientHandle = IoTHubClient_LL_CreateFromConnectionString(connectionString, HTTP_Protocol)) == NULL)
AzureIoTClient 18:e3e29fc771c9 117 {
Azure.IoT Build 33:f8eb46ca453d 118 (void)printf("ERROR: iotHubClientHandle is NULL!\r\n");
AzureIoTClient 18:e3e29fc771c9 119 }
AzureIoTClient 18:e3e29fc771c9 120 else
AzureIoTClient 18:e3e29fc771c9 121 {
Azure.IoT Build 33:f8eb46ca453d 122 unsigned int timeout = 241000;
Azure.IoT Build 33:f8eb46ca453d 123 // Because it can poll "after 9 seconds" polls will happen effectively // at ~10 seconds.
Azure.IoT Build 33:f8eb46ca453d 124 // Note that for scalabilty, the default value of minimumPollingTime
Azure.IoT Build 33:f8eb46ca453d 125 // is 25 minutes. For more information, see:
Azure.IoT Build 33:f8eb46ca453d 126 // https://azure.microsoft.com/documentation/articles/iot-hub-devguide/#messaging
Azure.IoT Build 33:f8eb46ca453d 127 unsigned int minimumPollingTime = 9;
Azure.IoT Build 33:f8eb46ca453d 128 if (IoTHubClient_LL_SetOption(iotHubClientHandle, "timeout", &timeout) != IOTHUB_CLIENT_OK)
Azure.IoT Build 33:f8eb46ca453d 129 {
Azure.IoT Build 33:f8eb46ca453d 130 printf("failure to set option \"timeout\"\r\n");
Azure.IoT Build 33:f8eb46ca453d 131 }
AzureIoTClient 20:52f8298d7256 132
Azure.IoT Build 33:f8eb46ca453d 133 if (IoTHubClient_LL_SetOption(iotHubClientHandle, "MinimumPollingTime", &minimumPollingTime) != IOTHUB_CLIENT_OK)
AzureIoTClient 18:e3e29fc771c9 134 {
Azure.IoT Build 33:f8eb46ca453d 135 printf("failure to set option \"MinimumPollingTime\"\r\n");
Azure.IoT Build 33:f8eb46ca453d 136 }
Azure.IoT Build 33:f8eb46ca453d 137
Azure.IoT Build 33:f8eb46ca453d 138 #ifdef MBED_BUILD_TIMESTAMP
Azure.IoT Build 33:f8eb46ca453d 139 // For mbed add the certificate information
Azure.IoT Build 33:f8eb46ca453d 140 if (IoTHubClient_LL_SetOption(iotHubClientHandle, "TrustedCerts", certificates) != IOTHUB_CLIENT_OK)
Azure.IoT Build 33:f8eb46ca453d 141 {
Azure.IoT Build 33:f8eb46ca453d 142 printf("failure to set option \"TrustedCerts\"\r\n");
Azure.IoT Build 33:f8eb46ca453d 143 }
Azure.IoT Build 33:f8eb46ca453d 144 #endif // MBED_BUILD_TIMESTAMP
Azure.IoT Build 33:f8eb46ca453d 145
Azure.IoT Build 33:f8eb46ca453d 146 /* Setting Message call back, so we can receive Commands. */
Azure.IoT Build 33:f8eb46ca453d 147 if (IoTHubClient_LL_SetMessageCallback(iotHubClientHandle, ReceiveMessageCallback, &receiveContext) != IOTHUB_CLIENT_OK)
Azure.IoT Build 33:f8eb46ca453d 148 {
Azure.IoT Build 33:f8eb46ca453d 149 (void)printf("ERROR: IoTHubClient_LL_SetMessageCallback..........FAILED!\r\n");
Azure.IoT Build 33:f8eb46ca453d 150 }
Azure.IoT Build 33:f8eb46ca453d 151 else
Azure.IoT Build 33:f8eb46ca453d 152 {
Azure.IoT Build 33:f8eb46ca453d 153 int i;
Azure.IoT Build 33:f8eb46ca453d 154
Azure.IoT Build 33:f8eb46ca453d 155 (void)printf("IoTHubClient_LL_SetMessageCallback...successful.\r\n");
Azure.IoT Build 33:f8eb46ca453d 156
Azure.IoT Build 33:f8eb46ca453d 157 /* Now that we are ready to receive commands, let's send some messages */
Azure.IoT Build 33:f8eb46ca453d 158 for (i = 0; i < MESSAGE_COUNT; i++)
AzureIoTClient 18:e3e29fc771c9 159 {
Azure.IoT Build 33:f8eb46ca453d 160 sprintf_s(msgText, sizeof(msgText), "{\"deviceId\": \"myFirstDevice\",\"windSpeed\": %.2f}", avgWindSpeed + (rand() % 4 + 2));
Azure.IoT Build 33:f8eb46ca453d 161 if ((messages[i].messageHandle = IoTHubMessage_CreateFromByteArray((const unsigned char*)msgText, strlen(msgText))) == NULL)
AzureIoTClient 18:e3e29fc771c9 162 {
Azure.IoT Build 33:f8eb46ca453d 163 (void)printf("ERROR: iotHubMessageHandle is NULL!\r\n");
AzureIoTClient 18:e3e29fc771c9 164 }
AzureIoTClient 18:e3e29fc771c9 165 else
AzureIoTClient 18:e3e29fc771c9 166 {
Azure.IoT Build 33:f8eb46ca453d 167 MAP_HANDLE propMap;
Azure.IoT Build 33:f8eb46ca453d 168
Azure.IoT Build 33:f8eb46ca453d 169 messages[i].messageTrackingId = i;
Azure.IoT Build 33:f8eb46ca453d 170
Azure.IoT Build 33:f8eb46ca453d 171 propMap = IoTHubMessage_Properties(messages[i].messageHandle);
Azure.IoT Build 33:f8eb46ca453d 172 sprintf_s(propText, sizeof(propText), "PropMsg_%d", i);
Azure.IoT Build 33:f8eb46ca453d 173 if (Map_AddOrUpdate(propMap, "PropName", propText) != MAP_OK)
Azure.IoT Build 33:f8eb46ca453d 174 {
Azure.IoT Build 33:f8eb46ca453d 175 (void)printf("ERROR: Map_AddOrUpdate Failed!\r\n");
Azure.IoT Build 33:f8eb46ca453d 176 }
Azure.IoT Build 33:f8eb46ca453d 177
Azure.IoT Build 33:f8eb46ca453d 178 if (IoTHubClient_LL_SendEventAsync(iotHubClientHandle, messages[i].messageHandle, SendConfirmationCallback, &messages[i]) != IOTHUB_CLIENT_OK)
Azure.IoT Build 33:f8eb46ca453d 179 {
Azure.IoT Build 33:f8eb46ca453d 180 (void)printf("ERROR: IoTHubClient_LL_SendEventAsync..........FAILED!\r\n");
Azure.IoT Build 33:f8eb46ca453d 181 }
Azure.IoT Build 33:f8eb46ca453d 182 else
Azure.IoT Build 33:f8eb46ca453d 183 {
Azure.IoT Build 33:f8eb46ca453d 184 (void)printf("IoTHubClient_LL_SendEventAsync accepted message [%d] for transmission to IoT Hub.\r\n", i);
Azure.IoT Build 33:f8eb46ca453d 185 }
Azure.IoT Build 33:f8eb46ca453d 186
AzureIoTClient 18:e3e29fc771c9 187 }
AzureIoTClient 18:e3e29fc771c9 188 }
AzureIoTClient 18:e3e29fc771c9 189 }
AzureIoTClient 18:e3e29fc771c9 190
Azure.IoT Build 33:f8eb46ca453d 191 /* Wait for Commands. */
Azure.IoT Build 33:f8eb46ca453d 192 while (1)
Azure.IoT Build 33:f8eb46ca453d 193 {
Azure.IoT Build 33:f8eb46ca453d 194 IoTHubClient_LL_DoWork(iotHubClientHandle);
Azure.IoT Build 33:f8eb46ca453d 195 }
Azure.IoT Build 33:f8eb46ca453d 196
Azure.IoT Build 33:f8eb46ca453d 197 IoTHubClient_LL_Destroy(iotHubClientHandle);
AzureIoTClient 18:e3e29fc771c9 198 }
Azure.IoT Build 33:f8eb46ca453d 199 platform_deinit();
AzureIoTClient 18:e3e29fc771c9 200 }
AzureIoTClient 18:e3e29fc771c9 201 }