IoTHub raw messaging client sample using MQTT
Dependencies: EthernetInterface NTPClient mbed-rtos mbed wolfSSL azure_c_shared_utility iothub_client azure_umqtt_c iothub_mqtt_transport
iothub_client_sample_mqtt.c
- Committer:
- AzureIoTClient
- Date:
- 2016-04-24
- Revision:
- 6:02304619a9fa
- Parent:
- 2:65c172c36cf5
- Child:
- 7:02bc67ebbe23
File content as of revision 6:02304619a9fa:
// Copyright (c) Microsoft. All rights reserved. // Licensed under the MIT license. See LICENSE file in the project root for full license information. #include <stdio.h> #include <stdlib.h> #include "iothub_client.h" #include "iothub_message.h" #include "azure_c_shared_utility/threadapi.h" #include "azure_c_shared_utility/crt_abstractions.h" #include "iothubtransportmqtt.h" #include "azure_c_shared_utility/platform.h" #ifdef MBED_BUILD_TIMESTAMP #include "certs.h" #endif // MBED_BUILD_TIMESTAMP static const char* connectionString = "[device connection string]"; static int callbackCounter; static char msgText[1024]; static char propText[1024]; #define MESSAGE_COUNT 5 static bool continueRunning; DEFINE_ENUM_STRINGS(IOTHUB_CLIENT_CONFIRMATION_RESULT, IOTHUB_CLIENT_CONFIRMATION_RESULT_VALUES); typedef struct EVENT_INSTANCE_TAG { IOTHUB_MESSAGE_HANDLE messageHandle; int messageTrackingId; // For tracking the messages within the user callback. } EVENT_INSTANCE; static IOTHUBMESSAGE_DISPOSITION_RESULT ReceiveMessageCallback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback) { int* counter = (int*)userContextCallback; const char* buffer; size_t size; if (IoTHubMessage_GetByteArray(message, (const unsigned char**)&buffer, &size) != IOTHUB_MESSAGE_OK) { (void)printf("unable to retrieve the message data\r\n"); } else { (void)printf("Received Message [%d] with Data: <<<%.*s>>> & Size=%d\r\n", *counter, (int)size, buffer, (int)size); // If we receive the work 'quit' then we stop running if (memcmp(buffer, "quit", size) == 0) { continueRunning = false; } } // Retrieve properties from the message MAP_HANDLE mapProperties = IoTHubMessage_Properties(message); if (mapProperties != NULL) { const char*const* keys; const char*const* values; size_t propertyCount = 0; if (Map_GetInternals(mapProperties, &keys, &values, &propertyCount) == MAP_OK) { if (propertyCount > 0) { for (size_t index = 0; index < propertyCount; index++) { (void)printf("\tKey: %s Value: %s\r\n", keys[index], values[index]); } (void)printf("\r\n"); } } } /* Some device specific action code goes here... */ (*counter)++; return IOTHUBMESSAGE_ACCEPTED; } static void SendConfirmationCallback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void* userContextCallback) { EVENT_INSTANCE* eventInstance = (EVENT_INSTANCE*)userContextCallback; (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)); /* Some device specific action code goes here... */ callbackCounter++; IoTHubMessage_Destroy(eventInstance->messageHandle); } void iothub_client_sample_mqtt_run(void) { IOTHUB_CLIENT_LL_HANDLE iotHubClientHandle; EVENT_INSTANCE messages[MESSAGE_COUNT]; continueRunning = true; srand((unsigned int)time(NULL)); double avgWindSpeed = 10.0; callbackCounter = 0; int receiveContext = 0; if (platform_init() != 0) { (void)printf("Failed to initialize the platform.\r\n"); } else { (void)printf("Starting the IoTHub client sample MQTT...\r\n"); if ((iotHubClientHandle = IoTHubClient_LL_CreateFromConnectionString(connectionString, MQTT_Protocol)) == NULL) { (void)printf("ERROR: iotHubClientHandle is NULL!\r\n"); } else { bool traceOn = true; IoTHubClient_LL_SetOption(iotHubClientHandle, "logtrace", &traceOn); #ifdef MBED_BUILD_TIMESTAMP // For mbed add the certificate information if (IoTHubClient_LL_SetOption(iotHubClientHandle, "TrustedCerts", certificates) != IOTHUB_CLIENT_OK) { printf("failure to set option \"TrustedCerts\"\r\n"); } #endif // MBED_BUILD_TIMESTAMP /* Setting Message call back, so we can receive Commands. */ if (IoTHubClient_LL_SetMessageCallback(iotHubClientHandle, ReceiveMessageCallback, &receiveContext) != IOTHUB_CLIENT_OK) { (void)printf("ERROR: IoTHubClient_LL_SetMessageCallback..........FAILED!\r\n"); } else { (void)printf("IoTHubClient_LL_SetMessageCallback...successful.\r\n"); /* Now that we are ready to receive commands, let's send some messages */ for (size_t i = 0; i < MESSAGE_COUNT; i++) { sprintf_s(msgText, sizeof(msgText), "{\"deviceId\":\"myFirstDevice\",\"windSpeed\":%.2f}", avgWindSpeed + (rand() % 4 + 2)); if ((messages[i].messageHandle = IoTHubMessage_CreateFromByteArray((const unsigned char*)msgText, strlen(msgText))) == NULL) { (void)printf("ERROR: iotHubMessageHandle is NULL!\r\n"); } else { messages[i].messageTrackingId = i; MAP_HANDLE propMap = IoTHubMessage_Properties(messages[i].messageHandle); sprintf_s(propText, sizeof(propText), "PropMsg_%d", i); if (Map_AddOrUpdate(propMap, "PropName", propText) != MAP_OK) { (void)printf("ERROR: Map_AddOrUpdate Failed!\r\n"); } if (IoTHubClient_LL_SendEventAsync(iotHubClientHandle, messages[i].messageHandle, SendConfirmationCallback, &messages[i]) != IOTHUB_CLIENT_OK) { (void)printf("ERROR: IoTHubClient_LL_SendEventAsync..........FAILED!\r\n"); } else { (void)printf("IoTHubClient_LL_SendEventAsync accepted message [%d] for transmission to IoT Hub.\r\n", (int)i); } } } } /* Wait for Commands. */ while (continueRunning) { IoTHubClient_LL_DoWork(iotHubClientHandle); ThreadAPI_Sleep(1); } IoTHubClient_LL_Destroy(iotHubClientHandle); } platform_deinit(); } }