source: azure_iot_hub/trunk/azure_iothub/iothub_client/inc/iothub_client.h@ 389

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

/** @file iothub_client.h
*    @brief Extends the IoTHubCLient_LL module with additional features.
*
*    @details IoTHubClient is a module that extends the IoTHubCLient_LL
*             module with 2 features:
*                - scheduling the work for the IoTHubCLient from a
*                  thread, so that the user does not need to create their
*                  own thread
*                - thread-safe APIs
*/

#ifndef IOTHUB_CLIENT_H
#define IOTHUB_CLIENT_H

#include <stddef.h>
#include <stdint.h>

#include "azure_c_shared_utility/umock_c_prod.h"
#include "iothub_transport_ll.h"
#include "iothub_client_core_ll.h"
#include "iothub_client_core.h"
#include "iothub_client_ll.h"

#ifndef IOTHUB_CLIENT_INSTANCE_TYPE
typedef IOTHUB_CLIENT_CORE_HANDLE IOTHUB_CLIENT_HANDLE;
#define IOTHUB_CLIENT_INSTANCE_TYPE
#endif // IOTHUB_CLIENT_INSTANCE


#ifdef __cplusplus
extern "C"
{
#endif

    /**
    * @brief    Creates a IoT Hub client for communication with an existing
    *             IoT Hub using the specified connection string parameter.
    *
    * @param    connectionString    Pointer to a character string
    * @param    protocol            Function pointer for protocol implementation
    *
    *            Sample connection string:
    *                <blockquote>
    *                    <pre>HostName=[IoT Hub name goes here].[IoT Hub suffix goes here, e.g., private.azure-devices-int.net];DeviceId=[Device ID goes here];SharedAccessKey=[Device key goes here];</pre>
    *                   <pre>HostName=[IoT Hub name goes here].[IoT Hub suffix goes here, e.g., private.azure-devices-int.net];DeviceId=[Device ID goes here];SharedAccessSignature=SharedAccessSignature sr=[IoT Hub name goes here].[IoT Hub suffix goes here, e.g., private.azure-devices-int.net]/devices/[Device ID goes here]&sig=[SAS Token goes here]&se=[Expiry Time goes here];</pre>
    *                </blockquote>
    *
    * @return    A non-NULL @c IOTHUB_CLIENT_HANDLE value that is used when
    *             invoking other functions for IoT Hub client and @c NULL on failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_HANDLE, IoTHubClient_CreateFromConnectionString, const char*, connectionString, IOTHUB_CLIENT_TRANSPORT_PROVIDER, protocol);

    /**
    * @brief    Creates a IoT Hub client for communication with an existing IoT
    *             Hub using the specified parameters.
    *
    * @param    config    Pointer to an @c IOTHUB_CLIENT_CONFIG structure
    *
    *            The API does not allow sharing of a connection across multiple
    *            devices. This is a blocking call.
    *
    * @return    A non-NULL @c IOTHUB_CLIENT_HANDLE value that is used when
    *             invoking other functions for IoT Hub client and @c NULL on failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_HANDLE, IoTHubClient_Create, const IOTHUB_CLIENT_CONFIG*, config);

    /**
    * @brief    Creates a IoT Hub client for communication with an existing IoT
    *             Hub using the specified parameters.
    *
    * @param    transportHandle    TRANSPORT_HANDLE which represents a connection.
    * @param    config    Pointer to an @c IOTHUB_CLIENT_CONFIG structure
    *
    *            The API allows sharing of a connection across multiple
    *            devices. This is a blocking call.
    *
    * @return    A non-NULL @c IOTHUB_CLIENT_HANDLE value that is used when
    *             invoking other functions for IoT Hub client and @c NULL on failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_HANDLE, IoTHubClient_CreateWithTransport, TRANSPORT_HANDLE, transportHandle, const IOTHUB_CLIENT_CONFIG*, config);

    /**
    * @brief    Creates a IoT Hub client for communication with an existing IoT
    *             Hub using the device auth module.
    *
    * @param    iothub_uri    Pointer to an ioThub hostname received in the registration process
    * @param    device_id    Pointer to the device Id of the device
    * @param    protocol    Function pointer for protocol implementation
    *
    * @return    A non-NULL @c IOTHUB_CLIENT_LL_HANDLE value that is used when
    *             invoking other functions for IoT Hub client and @c NULL on failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_HANDLE, IoTHubClient_CreateFromDeviceAuth, const char*, iothub_uri, const char*, device_id, IOTHUB_CLIENT_TRANSPORT_PROVIDER, protocol);

    /**
    * @brief    Disposes of resources allocated by the IoT Hub client. This is a
    *             blocking call.
    *
    * @param    iotHubClientHandle    The handle created by a call to the create function.
    */
    MOCKABLE_FUNCTION(, void, IoTHubClient_Destroy, IOTHUB_CLIENT_HANDLE, iotHubClientHandle);

    /**
    * @brief    Asynchronous call to send the message specified by @p eventMessageHandle.
    *
    * @param    iotHubClientHandle               The handle created by a call to the create function.
    * @param    eventMessageHandle               The handle to an IoT Hub message.
    * @param    eventConfirmationCallback      The callback specified by the device for receiving
    *                                         confirmation of the delivery of the IoT Hub message.
    *                                         This callback can be expected to invoke the
    *                                         ::IoTHubClient_SendEventAsync function for the
    *                                         same message in an attempt to retry sending a failing
    *                                         message. The user can specify a @c NULL value here to
    *                                         indicate that no callback is required.
    * @param    userContextCallback            User specified context that will be provided to the
    *                                         callback. This can be @c NULL.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SendEventAsync, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_MESSAGE_HANDLE, eventMessageHandle, IOTHUB_CLIENT_EVENT_CONFIRMATION_CALLBACK, eventConfirmationCallback, void*, userContextCallback);

    /**
    * @brief    This function returns the current sending status for IoTHubClient.
    *
    * @param    iotHubClientHandle        The handle created by a call to the create function.
    * @param    iotHubClientStatus        The sending state is populated at the address pointed
    *                                     at by this parameter. The value will be set to
    *                                     @c IOTHUBCLIENT_SENDSTATUS_IDLE if there is currently
    *                                     no item to be sent and @c IOTHUBCLIENT_SENDSTATUS_BUSY
    *                                     if there are.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_GetSendStatus, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_STATUS*, iotHubClientStatus);

    /**
    * @brief    Sets up the message callback to be invoked when IoT Hub issues a
    *             message to the device. This is a blocking call.
    *
    * @param    iotHubClientHandle               The handle created by a call to the create function.
    * @param    messageCallback                The callback specified by the device for receiving
    *                                         messages from IoT Hub.
    * @param    userContextCallback            User specified context that will be provided to the
    *                                         callback. This can be @c NULL.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetMessageCallback, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_MESSAGE_CALLBACK_ASYNC, messageCallback, void*, userContextCallback);

    /**
    * @brief    Sets up the connection status callback to be invoked representing the status of
    * the connection to IOT Hub. This is a blocking call.
    *
    * @param    iotHubClientHandle                       The handle created by a call to the create function.
    * @param    connectionStatusCallback                The callback specified by the device for receiving
    *                                                 updates about the status of the connection to IoT Hub.
    * @param    userContextCallback                    User specified context that will be provided to the
    *                                                 callback. This can be @c NULL.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_LL_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetConnectionStatusCallback, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_CONNECTION_STATUS_CALLBACK, connectionStatusCallback, void*, userContextCallback);

    /**
    * @brief    Sets up the connection status callback to be invoked representing the status of
    * the connection to IOT Hub. This is a blocking call.
    *
    * @param    iotHubClientHandle                       The handle created by a call to the create function.
    * @param    retryPolicy                             The policy to use to reconnect to IoT Hub when a
    *                                               connection drops.
    * @param    retryTimeoutLimitInSeconds            Maximum amount of time(seconds) to attempt reconnection when a
    *                                               connection drops to IOT Hub.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_LL_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetRetryPolicy, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_RETRY_POLICY, retryPolicy, size_t, retryTimeoutLimitInSeconds);

    /**
    * @brief    Sets up the connection status callback to be invoked representing the status of
    * the connection to IOT Hub. This is a blocking call.
    *
    * @param    iotHubClientHandle                       The handle created by a call to the create function.
    * @param    retryPolicy                             Out parameter containing the policy to use to reconnect to IoT Hub.
    * @param    retryTimeoutLimitInSeconds            Out parameter containing maximum amount of time in seconds to attempt reconnection
    to IOT Hub.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_LL_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_GetRetryPolicy, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_RETRY_POLICY*, retryPolicy, size_t*, retryTimeoutLimitInSeconds);

    /**
    * @brief    This function returns in the out parameter @p lastMessageReceiveTime
    *             what was the value of the @c time function when the last message was
    *             received at the client.
    *
    * @param    iotHubClientHandle                The handle created by a call to the create function.
    * @param    lastMessageReceiveTime          Out parameter containing the value of @c time function
    *                                             when the last message was received.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_GetLastMessageReceiveTime, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, time_t*, lastMessageReceiveTime);

    /**
    * @brief    This API sets a runtime option identified by parameter @p optionName
    *             to a value pointed to by @p value. @p optionName and the data type
    *             @p value is pointing to are specific for every option.
    *
    * @param    iotHubClientHandle    The handle created by a call to the create function.
    * @param    optionName              Name of the option.
    * @param    value                  The value.
    *
    *            The options that can be set via this API are:
    *                - @b timeout - the maximum time in milliseconds a communication is
    *                  allowed to use. @p value is a pointer to an @c unsigned @c int with
    *                  the timeout value in milliseconds. This is only supported for the HTTP
    *                  protocol as of now. When the HTTP protocol uses CURL, the meaning of
    *                  the parameter is <em>total request time</em>. When the HTTP protocol uses
    *                  winhttp, the meaning is the same as the @c dwSendTimeout and
    *                  @c dwReceiveTimeout parameters of the
    *                  <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/aa384116(v=vs.85).aspx">
    *                  WinHttpSetTimeouts</a> API.
    *                - @b CURLOPT_LOW_SPEED_LIMIT - only available for HTTP protocol and only
    *                  when CURL is used. It has the same meaning as CURL's option with the same
    *                  name. @p value is pointer to a long.
    *                - @b CURLOPT_LOW_SPEED_TIME - only available for HTTP protocol and only
    *                  when CURL is used. It has the same meaning as CURL's option with the same
    *                  name. @p value is pointer to a long.
    *                - @b CURLOPT_FORBID_REUSE - only available for HTTP protocol and only
    *                  when CURL is used. It has the same meaning as CURL's option with the same
    *                  name. @p value is pointer to a long.
    *                - @b CURLOPT_FRESH_CONNECT - only available for HTTP protocol and only
    *                  when CURL is used. It has the same meaning as CURL's option with the same
    *                  name. @p value is pointer to a long.
    *                - @b CURLOPT_VERBOSE - only available for HTTP protocol and only
    *                  when CURL is used. It has the same meaning as CURL's option with the same
    *                  name. @p value is pointer to a long.
    *                - @b messageTimeout - the maximum time in milliseconds until a message
    *                 is timeouted. The time starts at IoTHubClient_SendEventAsync. By default,
    *                 messages do not expire. @p is a pointer to a uint64_t
    *                - @b svc2cl_keep_alive_timeout_secs - the AMQP service side keep alive interval in seconds.
    *                 After the connection established the client requests the server to set the
    *                 keep alive interval for given time.
    *                 If it is not set then the default 240 sec applies.
    *                 If it is set to zero the server will not send keep alive messages to the client.
    *                - @b cl2svc_keep_alive_send_ratio - the AMQP client side keep alive interval in seconds.
    *                 After the connection established the server requests the client to set the
    *                 keep alive interval for given time.
    *                 If it is not set then the default ratio of 1/2 is applied.
    *                 The ratio has to be greater than 0.0 and equal to or less than 0.9

    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetOption, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, const char*, optionName, const void*, value);

    /**
    * @brief    This API specifies a call back to be used when the device receives a state update.
    *
    * @param    iotHubClientHandle        The handle created by a call to the create function.
    * @param    deviceTwinCallback        The callback specified by the device client to be used for updating
    *                                    the desired state. The callback will be called in response to a
    *                                    request send by the IoTHub services. The payload will be passed to the
    *                                    callback, along with two version numbers:
    *                                        - Desired:
    *                                        - LastSeenReported:
    * @param    userContextCallback        User specified context that will be provided to the
    *                                     callback. This can be @c NULL.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetDeviceTwinCallback, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_DEVICE_TWIN_CALLBACK, deviceTwinCallback, void*, userContextCallback);

    /**
    * @brief    This API sends a report of the device's properties and their current values.
    *
    * @param    iotHubClientHandle        The handle created by a call to the create function.
    * @param    reportedState            The current device property values to be 'reported' to the IoTHub.
    * @param    reportedStateCallback    The callback specified by the device client to be called with the
    *                                    result of the transaction.
    * @param    userContextCallback        User specified context that will be provided to the
    *                                     callback. This can be @c NULL.
    *
    *            @b NOTE: The application behavior is undefined if the user calls
    *            the ::IoTHubClient_Destroy function from within any callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SendReportedState, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, const unsigned char*, reportedState, size_t, size, IOTHUB_CLIENT_REPORTED_STATE_CALLBACK, reportedStateCallback, void*, userContextCallback);

    /**
    * @brief    This API sets callback for cloud to device method call.
    *
    * @param    iotHubClientHandle        The handle created by a call to the create function.
    * @param    deviceMethodCallback    The callback which will be called by IoTHub.
    * @param    userContextCallback        User specified context that will be provided to the
    *                                     callback. This can be @c NULL.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetDeviceMethodCallback, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_DEVICE_METHOD_CALLBACK_ASYNC, deviceMethodCallback, void*, userContextCallback);

    /**
    * @brief    This API sets callback for async cloud to device method call.
    *
    * @param    iotHubClientHandle                The handle created by a call to the create function.
    * @param    inboundDeviceMethodCallback     The callback which will be called by IoTHub.
    * @param    userContextCallback                User specified context that will be provided to the
    *                                             callback. This can be @c NULL.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_SetDeviceMethodCallback_Ex, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, IOTHUB_CLIENT_INBOUND_DEVICE_METHOD_CALLBACK, inboundDeviceMethodCallback, void*, userContextCallback);

    /**
    * @brief    This API responses to a asnyc method callback identified the methodId.
    *
    * @param    iotHubClientHandle      The handle created by a call to the create function.
    * @param    methodId                The methodId of the Device Method callback.
    * @param    response                The response data for the method callback.
    * @param    response_size           The size of the response data buffer.
    * @param    status_response         The status response of the method callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_DeviceMethodResponse, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, METHOD_HANDLE, methodId, const unsigned char*, response, size_t, response_size, int, statusCode);

#ifndef DONT_USE_UPLOADTOBLOB
    /**
    * @brief    IoTHubClient_UploadToBlobAsync uploads data from memory to a file in Azure Blob Storage.
    *
    * @param    iotHubClientHandle                    The handle created by a call to the IoTHubClient_Create function.
    * @param    destinationFileName                    The name of the file to be created in Azure Blob Storage.
    * @param    source                              The source of data.
    * @param    size                                The size of data.
    * @param    iotHubClientFileUploadCallback      A callback to be invoked when the file upload operation has finished.
    * @param    context                             A user-provided context to be passed to the file upload callback.
    *
    * @return    IOTHUB_CLIENT_OK upon success or an error code upon failure.
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_UploadToBlobAsync, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, const char*, destinationFileName, const unsigned char*, source, size_t, size, IOTHUB_CLIENT_FILE_UPLOAD_CALLBACK, iotHubClientFileUploadCallback, void*, context);

    /**
    ** DEPRECATED: Use IoTHubClient_UploadMultipleBlocksToBlobAsyncEx instead **
    * @brief                          Uploads a file to a Blob storage in chunks, fed through the callback function provided by the user.
    * @remarks                        This function allows users to upload large files in chunks, not requiring the whole file content to be passed in memory.
    * @param iotHubClientHandle       The handle created by a call to the IoTHubClient_Create function.
    * @param destinationFileName      The name of the file to be created in Azure Blob Storage.
    * @param getDataCallback          A callback to be invoked to acquire the file chunks to be uploaded, as well as to indicate the status of the upload of the previous block.
    * @param context                  Any data provided by the user to serve as context on getDataCallback.
    * @returns                        An IOTHUB_CLIENT_RESULT value indicating the success or failure of the API call.
    ** DEPRECATED: Use IoTHubClient_UploadMultipleBlocksToBlobAsyncEx instead **
    */
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_UploadMultipleBlocksToBlobAsync, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, const char*, destinationFileName, IOTHUB_CLIENT_FILE_UPLOAD_GET_DATA_CALLBACK, getDataCallback, void*, context);

    /**
    * @brief                          Uploads a file to a Blob storage in chunks, fed through the callback function provided by the user.
    * @remarks                        This function allows users to upload large files in chunks, not requiring the whole file content to be passed in memory.
    * @param iotHubClientHandle       The handle created by a call to the IoTHubClient_Create function.
    * @param destinationFileName      The name of the file to be created in Azure Blob Storage.
    * @param getDataCallbackEx        A callback to be invoked to acquire the file chunks to be uploaded, as well as to indicate the status of the upload of the previous block.
    * @param context                  Any data provided by the user to serve as context on getDataCallback.
    * @returns                        An IOTHUB_CLIENT_RESULT value indicating the success or failure of the API call.*/
    MOCKABLE_FUNCTION(, IOTHUB_CLIENT_RESULT, IoTHubClient_UploadMultipleBlocksToBlobAsyncEx, IOTHUB_CLIENT_HANDLE, iotHubClientHandle, const char*, destinationFileName, IOTHUB_CLIENT_FILE_UPLOAD_GET_DATA_CALLBACK_EX, getDataCallbackEx, void*, context);

#endif /* DONT_USE_UPLOADTOBLOB */

#ifdef __cplusplus
}
#endif

#endif /* IOTHUB_CLIENT_H */