File content as of revision 36:67300d5a4c1f:

// 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 "iothub_client_ll.h"

#ifdef __cplusplus
extern "C"
{
#endif

    typedef struct IOTHUB_CLIENT_INSTANCE_TAG* IOTHUB_CLIENT_HANDLE;

    /**
    * @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>
    *				</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.
    */
    extern 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.
    */
    extern IOTHUB_CLIENT_HANDLE IoTHubClient_Create(const IOTHUB_CLIENT_CONFIG* config);

    /**
    * @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.
    */
    extern 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.
    */
    extern 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.
    */
    extern 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.
    */
    extern IOTHUB_CLIENT_RESULT IoTHubClient_SetMessageCallback(IOTHUB_CLIENT_HANDLE iotHubClientHandle, IOTHUB_CLIENT_MESSAGE_CALLBACK_ASYNC messageCallback, void* userContextCallback);

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

#ifdef __cplusplus
}
#endif

#endif /* IOTHUB_CLIENT_H */