Diff: iothub_client_sample_mqtt.c

Revision:

2:65c172c36cf5

Child:

6:02304619a9fa

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/iothub_client_sample_mqtt.c	Fri Mar 25 16:10:00 2016 -0700
@@ -0,0 +1,173 @@
+// 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 "threadapi.h"
+#include "crt_abstractions.h"
+#include "iothubtransportmqtt.h"
+#include "platform.h"
+
+#ifdef MBED_BUILD_TIMESTAMP
+#include "certs.h"
+#endif // MBED_BUILD_TIMESTAMP
+
+
+/*String containing Hostname, Device Id & Device Key in the format:             */
+/*  "HostName=<host_name>;DeviceId=<device_id>;SharedAccessKey=<device_key>"    */
+static const char* connectionString = "[device connection string]";
+
+static int callbackCounter;
+static char msgText[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)
+            {
+                (void)printf("ERROR: message incorrectly contains properties!\r\n");
+                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;
+
+                        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();
+    }
+}