libs2opc_new_client.h File Reference

High level interface to run an OPC UA client. More...

#include <stdbool.h>
#include <stdint.h>
#include "sopc_types.h"
#include "libs2opc_client_config.h"

Go to the source code of this file.

Typedefs
typedef struct SOPC_ClientConnection	SOPC_ClientConnection
	Structure representing a secure connection to a server. More...
typedef void	SOPC_ClientConnectionEvent_Fct(SOPC_ClientConnection *config, SOPC_ClientConnectionEvent event, SOPC_StatusCode status)
	Type of callback called on client connection event. More...
typedef struct SOPC_ClientHelper_Subscription	SOPC_ClientHelper_Subscription
typedef void	SOPC_ClientSubscriptionNotification_Fct(const SOPC_ClientHelper_Subscription *subscription, SOPC_StatusCode status, SOPC_EncodeableType *notificationType, uint32_t nbNotifElts, const void *notification, uintptr_t *monitoredItemCtxArray)
	Type of callback called on Subscription Notification. More...

Enumerations
enum	SOPC_ClientConnectionEvent { SOPC_ClientConnectionEvent_Disconnected, SOPC_ClientConnectionEvent_Connected, SOPC_ClientConnectionEvent_Reconnecting }

Functions
SOPC_ReturnStatus	SOPC_ClientHelperNew_DiscoveryServiceAsync (SOPC_SecureConnection_Config *secConnConfig, void *request, uintptr_t userContext)
	Send a discovery request without user session creation and activation and retrieve response asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_DiscoveryServiceSync (SOPC_SecureConnection_Config *secConnConfig, void *request, void **response)
	Send a discovery request without user session creation and activation and retrieve response synchronously. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Connect (SOPC_SecureConnection_Config *secConnConfig, SOPC_ClientConnectionEvent_Fct *connectEventCb, SOPC_ClientConnection **secureConnection)
	Establishes the connection in a blocking way (synchronously). More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Disconnect (SOPC_ClientConnection **secureConnection)
	Disconnects the connection established with SOPC_ClientHelperNew_Connect in a blocking way (synchronously). More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_ServiceAsync (SOPC_ClientConnection *secureConnection, void *request, uintptr_t userContext)
	Executes an OPC UA service on server (read, write, browse, discovery service, etc.) asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_ServiceSync (SOPC_ClientConnection *secureConnection, void *request, void **response)
	Executes an OPC UA service on server (read, write, browse, discovery service, etc.) synchronously. More...
SOPC_ClientHelper_Subscription *	SOPC_ClientHelperNew_CreateSubscription (SOPC_ClientConnection *secureConnection, OpcUa_CreateSubscriptionRequest *subParams, SOPC_ClientSubscriptionNotification_Fct *subNotifCb, uintptr_t userParam)
	Creates a subscription on the server. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_DeleteSubscription (SOPC_ClientHelper_Subscription **subscription)
	Deletes a subscription on the server. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_SetAvailableTokens (SOPC_ClientHelper_Subscription *subscription, uint32_t nbPublishTokens)
	Sets the number of publish tokens to be used for the subscription. This number shall be greater than 0 and indicates the number of publish request sent to the server that might be used to send back notifications. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_GetRevisedParameters (SOPC_ClientHelper_Subscription *subscription, double *revisedPublishingInterval, uint32_t *revisedLifetimeCount, uint32_t *revisedMaxKeepAliveCount)
	Gets the created subscription parameters values revised by the server. More...
uintptr_t	SOPC_ClientHelperNew_Subscription_GetUserParam (const SOPC_ClientHelper_Subscription *subscription)
	Returns the user parameter defined in SOPC_ClientHelperNew_CreateSubscription. More...
SOPC_ClientConnection *	SOPC_ClientHelperNew_GetSecureConnection (const SOPC_ClientHelper_Subscription *subscription)
	Gets the secure connection on which the subscription rely on. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_CreateMonitoredItems (const SOPC_ClientHelper_Subscription *subscription, OpcUa_CreateMonitoredItemsRequest *monitoredItemsReq, const uintptr_t *monitoredItemCtxArray, OpcUa_CreateMonitoredItemsResponse *monitoredItemsResp)
	Creates new monitored items on the given subscription. A context array might be provided and context will be provided on notification for corresponding monitored item in notification callback. A pointer to empty message response might be provided to retrieve the creation result and monitored item id affected by the server (needed to modify or delete monitored items prior to subscription deletion) More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_DeleteMonitoredItems (const SOPC_ClientHelper_Subscription *subscription, OpcUa_DeleteMonitoredItemsRequest *delMonitoredItemsReq, OpcUa_DeleteMonitoredItemsResponse *delMonitoredItemsResp)
	Deletes monitored items on the given subscription using the server monitored item ids. A pointer to empty message response might be provided to retrieve the deletion result. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_SyncService (const SOPC_ClientHelper_Subscription *subscription, void *subOrMIrequest, void **subOrMIresponse)
	Executes an OPC UA service on server related to the given subscription synchronously. More...
SOPC_ReturnStatus	SOPC_ClientHelperNew_Subscription_AsyncService (const SOPC_ClientHelper_Subscription *subscription, void *subOrMIrequest, uintptr_t userContext)
	Executes an OPC UA service on server related to the given subscription asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure. More...

Detailed Description

High level interface to run an OPC UA client.

Once the client is configured using functions of libs2opc_client_config.h, the client should establish connection using SOPC_ClientHelperNew_Connect or call a discovery service using SOPC_ClientHelperNew_DiscoveryServiceAsync (or SOPC_ClientHelperNew_DiscoveryServiceSync). Until connection is stopped by a call to SOPC_ClientHelperNew_Disconnect or due to an error (socket closed, etc.), the client application might use the connections. This is done using OPC UA services using SOPC_ClientHelperNew_ServiceAsync (or SOPC_ClientHelperNew_ServiceSync). The request messages can be built using the helper functions of libs2opc_request_builder.h (e.g.: SOPC_ReadRequest_Create, SOPC_ReadRequest_SetReadValue, etc.).

Dedicated functions are provided to handle subscriptions: SOPC_ClientHelperNew_CreateSubscription (SOPC_ClientHelperNew_DeleteSubscription) to create (delete) a unique subscription instance for the connection. SOPC_ClientHelperNew_Subscription_CreateMonitoredItems (SOPC_ClientHelperNew_Subscription_DeleteMonitoredItems) to create (delete) monitored items in a subscription instance. SOPC_ClientHelperNew_Subscription_AsyncService and SOPC_ClientHelperNew_Subscription_SyncService to call other subscription related services on the subscription instance.

Typedef Documentation

SOPC_ClientConnection

typedef struct SOPC_ClientConnection SOPC_ClientConnection

Structure representing a secure connection to a server.

SOPC_ClientConnectionEvent_Fct

typedef void SOPC_ClientConnectionEvent_Fct(SOPC_ClientConnection *config, SOPC_ClientConnectionEvent event, SOPC_StatusCode status)

Type of callback called on client connection event.

Warning

No blocking operation shall be done in callback

Parameters

config	Indicates the connection concerned by the event
event	The event that occurred on the connection
status	Indicates the return status of client connection

SOPC_ClientHelper_Subscription

typedef struct SOPC_ClientHelper_Subscription SOPC_ClientHelper_Subscription

SOPC_ClientSubscriptionNotification_Fct

typedef void SOPC_ClientSubscriptionNotification_Fct(const SOPC_ClientHelper_Subscription *subscription, SOPC_StatusCode status, SOPC_EncodeableType *notificationType, uint32_t nbNotifElts, const void *notification, uintptr_t *monitoredItemCtxArray)

Type of callback called on Subscription Notification.

Warning

No blocking operation shall be done in callback (e.g. call to SOPC_ClientHelperNew_Subscription_CreateMonitoredItems and SOPC_ClientHelperNew_Subscription_SyncService are forbidden)

Parameters

subscription	Indicates the subscription concerned by the notification
status	OPC UA status code for the subscription, notification is only valid when SOPC_IsGoodStatus
notificationType	Type of notification received (OpcUa_DataChangeNotification_EncodeableType or OpcUa_EventNotificationList_EncodeableType) or NULL (if status is not good)
nbNotifElts	Number of elements in notification received and in monitoredItemCtxArray
notification	Notification of the type indicated by notificationType, either pointer to a OpcUa_DataChangeNotification or OpcUa_EventNotificationList. Or NULL if status is not good. Content is freed after callback return, thus any content to record shall be copied.
monitoredItemCtxArray	Array of context for monitored items for which notification were received in notification. Notification element and monitored item context have the same index in the array.

Enumeration Type Documentation

SOPC_ClientConnectionEvent

enum SOPC_ClientConnectionEvent

Enumerator
SOPC_ClientConnectionEvent_Disconnected	Connection terminated unexpectedly, it will not be established again unless a new connection attempt is done. To do a new attempt the following functions shall be called: SOPC_ClientHelperNew_Disconnect on current connection SOPC_ClientHelperNew_Connect to create a new connection
SOPC_ClientConnectionEvent_Connected	(NOT IMPLEMENTED YET) Connection established (SC & session), only triggered when asynchronous SOPC_ClientHelperNew_StartConnection is used or in case of reconnection.
SOPC_ClientConnectionEvent_Reconnecting	(NOT IMPLEMENTED YET) Connection temporarily interrupted, attempt to re-establish connection on-going. Do not use connection until Connected event received

Function Documentation

SOPC_ClientHelperNew_DiscoveryServiceAsync()

SOPC_ReturnStatus SOPC_ClientHelperNew_DiscoveryServiceAsync	(	SOPC_SecureConnection_Config *	secConnConfig,
		void *	request,
		uintptr_t	userContext
	)

Send a discovery request without user session creation and activation and retrieve response asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure.

Parameters

secConnConfig	The secure connection configuration.
request	An instance of one of the following OPC UA request: OpcUa_FindServersRequest OpcUa_FindServersOnNetworkRequest OpcUa_GetEndpointsRequest OpcUa_RegisterServerRequest OpcUa_RegisterServer2Request

The request messages can be built using the helper functions of libs2opc_request_builder.h (e.g.: SOPC_GetEndpointsRequest_Create, SOPC_GetEndpointsRequest_SetPreferredLocales, etc.).

Parameters

userContext

User defined context that will be provided with the corresponding response in SOPC_LocalServiceAsyncResp_Fct

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, otherwise SOPC_STATUS_INVALID_STATE if the client is not running.

Warning

If the server endpoint is not a discovery endpoint, or an activated session is expected, usual connection and generic services functions shall be used.

Caller of this API should wait at least SOPC_REQUEST_TIMEOUT_MS milliseconds after calling this function and prior to call SOPC_ClientConfigHelper_Clear. It is necessary to ensure asynchronous context is freed and no memory leak occurs.

SOPC_ClientHelperNew_DiscoveryServiceSync()

SOPC_ReturnStatus SOPC_ClientHelperNew_DiscoveryServiceSync	(	SOPC_SecureConnection_Config *	secConnConfig,
		void *	request,
		void **	response
	)

Send a discovery request without user session creation and activation and retrieve response synchronously.

Parameters

secConnConfig	The secure connection configuration.
request	An instance of one of the following OPC UA request: OpcUa_FindServersRequest OpcUa_FindServersOnNetworkRequest OpcUa_GetEndpointsRequest OpcUa_RegisterServerRequest OpcUa_RegisterServer2Request

The request messages can be built using the helper functions of libs2opc_request_builder.h (e.g.: SOPC_GetEndpointsRequest_Create, SOPC_GetEndpointsRequest_SetPreferredLocales, etc.).

Parameters

[out]

response

Pointer into which instance of response complying with the OPC UA request is provided: OpcUa_FindServersResponse OpcUa_FindServersOnNetworkResponse OpcUa_GetEndpointsResponse OpcUa_GetEndpointsResponse OpcUa_RegisterServerResponse OpcUa_RegisterServer2Response In case of service failure the response type is always OpcUa_ServiceFault, in this case the response.encodeableType points to OpcUa_ServiceFault_EncodeableType and SOPC_IsGoodStatus(response.ResponseHeader.ServiceResult) is false.

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_TIMEOUT in case of timeout to receive response, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, SOPC_STATUS_INVALID_STATE if the client is not running. And dedicated status if request sending failed.

Note

Request memory is managed by the client after a successful return or in case of timeout

Caller is responsible of output response memory after successful call

Warning

If the server endpoint is not a discovery endpoint, or an activated session is expected, usual connection and generic services functions shall be used.

Service synchronous call shall only be called from the application thread and shall not be called from client callbacks used for notification, asynchronous response, client event, etc. (SOPC_ServiceAsyncResp_Fct, SOPC_ClientConnectionEvent_Fct, etc.). Otherwise this will lead to a deadlock situation.

SOPC_ClientHelperNew_Connect()

SOPC_ReturnStatus SOPC_ClientHelperNew_Connect	(	SOPC_SecureConnection_Config *	secConnConfig,
		SOPC_ClientConnectionEvent_Fct *	connectEventCb,
		SOPC_ClientConnection **	secureConnection
	)

Establishes the connection in a blocking way (synchronously).

Parameters

	secConnConfig	The secure connection configuration to establish
	connectEventCb	Callback called on connection event, it is only used in case of further unexpected disconnection
[out]	secureConnection	Pointer to the secure connection established when returned value is SOPC_STATUS_OK

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_CLOSED in case of failure, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, otherwise SOPC_STATUS_INVALID_STATE if the configuration is not possible (toolkit not initialized, connection state unexpected).

SOPC_ClientHelperNew_Disconnect()

SOPC_ReturnStatus SOPC_ClientHelperNew_Disconnect

(

SOPC_ClientConnection **

secureConnection

)

Disconnects the connection established with SOPC_ClientHelperNew_Connect in a blocking way (synchronously).

Parameters

secureConnection

Pointer to the secure connection reference to stop, set to NULL during successful call.

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, otherwise SOPC_STATUS_INVALID_STATE if the connection is already disconnected

SOPC_ClientHelperNew_ServiceAsync()

SOPC_ReturnStatus SOPC_ClientHelperNew_ServiceAsync	(	SOPC_ClientConnection *	secureConnection,
		void *	request,
		uintptr_t	userContext
	)

Executes an OPC UA service on server (read, write, browse, discovery service, etc.) asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure.

Note

SOPC_ClientHelperNew_Connect shall have been called and the connection shall be still active

Parameters

secureConnection	The client connection instance to use to execute the service
request	An instance of one of the following OPC UA request: OpcUa_ReadRequest OpcUa_WriteRequest OpcUa_BrowseRequest OpcUa_TranslateBrowsePathsToNodeIdsRequest OpcUa_GetEndpointsRequest OpcUa_FindServersRequest OpcUa_FindServersOnNetworkRequest OpcUa_RegisterServer2Request etc, ...

The request messages can be built using the helper functions of libs2opc_request_builder.h (e.g.: SOPC_ReadRequest_Create, SOPC_ReadRequest_SetReadValue, etc.).

Parameters

userContext

User defined context that will be provided with the corresponding response in SOPC_LocalServiceAsyncResp_Fct

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, otherwise SOPC_STATUS_INVALID_STATE if the client is not running.

Note

Request memory is managed by the client after a successful return

Warning

Caller of this API should wait at least SOPC_REQUEST_TIMEOUT_MS milliseconds after calling this function and prior to call SOPC_ClientConfigHelper_Clear. It is necessary to ensure asynchronous context is freed and no memory leak occurs.

SOPC_ClientHelperNew_ServiceSync()

SOPC_ReturnStatus SOPC_ClientHelperNew_ServiceSync	(	SOPC_ClientConnection *	secureConnection,
		void *	request,
		void **	response
	)

Executes an OPC UA service on server (read, write, browse, discovery service, etc.) synchronously.

Note

SOPC_ClientHelperNew_Connect shall have been called and the connection shall be still active

Parameters

secureConnection	The client connection instance to use to execute the service
request	An instance of OPC UA request: OpcUa_ReadRequest OpcUa_WriteRequest OpcUa_BrowseRequest OpcUa_TranslateBrowsePathsToNodeIdsRequest OpcUa_GetEndpointsRequest OpcUa_FindServersRequest OpcUa_FindServersOnNetworkRequest OpcUa_RegisterServer2Request etc, ...

The request messages can be built using the helper functions of libs2opc_request_builder.h (e.g.: SOPC_ReadRequest_Create, SOPC_ReadRequest_SetReadValue, etc.).

Note: it shall be allocated on heap since it will be freed by S2OPC library during treatment.

Parameters

[out]

response

Pointer into which instance of response complying with the OPC UA request is provided: OpcUa_ReadResponse OpcUa_WriteResponse OpcUa_BrowseResponse OpcUa_TranslateBrowsePathsToNodeIdsResponse OpcUa_GetEndpointsResponse OpcUa_FindServersResponse OpcUa_FindServersOnNetworkResponse OpcUa_RegisterServer2Response etc, ... In case of service failure the response type is always OpcUa_ServiceFault, in this case the response.encodeableType points to OpcUa_ServiceFault_EncodeableType and SOPC_IsGoodStatus(response.ResponseHeader.ServiceResult) is false.

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_TIMEOUT in case of timeout to receive response, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, SOPC_STATUS_INVALID_STATE if the client is not running. And dedicated status if request sending failed.

Note

Request memory is managed by the client after a successful return or in case of timeout.

Caller is responsible of output response memory after successful call. E.g. use SOPC_Encodeable_Delete.

Warning

service synchronous call shall only be called from the application thread and shall not be called from client callbacks used for asynchronous response, connections event, etc. (SOPC_ServiceAsyncResp_Fct, SOPC_ClientConnectionEvent_Fct, etc.). Otherwise this will lead to a deadlock situation.

SOPC_ClientHelperNew_CreateSubscription()

SOPC_ClientHelper_Subscription* SOPC_ClientHelperNew_CreateSubscription	(	SOPC_ClientConnection *	secureConnection,
		OpcUa_CreateSubscriptionRequest *	subParams,
		SOPC_ClientSubscriptionNotification_Fct *	subNotifCb,
		uintptr_t	userParam
	)

Creates a subscription on the server.

Warning

The current implementation is limited to 1 subscription per connection

Parameters

secureConnection	The client connection instance to use to execute the service
subParams	The subscription creation request containing subscription parameters (created using SOPC_CreateSubscriptionRequest_CreateDefault or :: SOPC_CreateSubscriptionRequest_Create)
subNotifCb	The callback to be called on subscription notification
userParam	The user parameter associated to the subscription that can be accessed using SOPC_ClientHelperNew_Subscription_GetUserParam

Returns

The subscription instance or NULL in case of error (invalid parameters, subscription already created, etc.)

SOPC_ClientHelperNew_DeleteSubscription()

SOPC_ReturnStatus SOPC_ClientHelperNew_DeleteSubscription

(

SOPC_ClientHelper_Subscription **

subscription

)

Deletes a subscription on the server.

Parameters

subscription

Pointer to the subscription pointer returned by SOPC_ClientHelperNew_CreateSubscription and to be deleted.

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, SOPC_STATUS_INVALID_STATE if the client or subscription is not running.

SOPC_ClientHelperNew_Subscription_SetAvailableTokens()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_SetAvailableTokens	(	SOPC_ClientHelper_Subscription *	subscription,
		uint32_t	nbPublishTokens
	)

Sets the number of publish tokens to be used for the subscription. This number shall be greater than 0 and indicates the number of publish request sent to the server that might be used to send back notifications.

Note

By default 3 publish tokens are configured.

A new publish request token is sent back to the server each time a publish response is received (i.e. token consumed)

Parameters

subscription	The subscription instance
nbPublishTokens	The number of publish tokens to be used by the client

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, SOPC_STATUS_INVALID_STATE if the client or subscription is not running.

SOPC_ClientHelperNew_Subscription_GetRevisedParameters()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_GetRevisedParameters	(	SOPC_ClientHelper_Subscription *	subscription,
		double *	revisedPublishingInterval,
		uint32_t *	revisedLifetimeCount,
		uint32_t *	revisedMaxKeepAliveCount
	)

Gets the created subscription parameters values revised by the server.

Parameters

	subscription	The subscription instance
[out]	revisedPublishingInterval	Pointer for the revised publishing interval output value (optional)
[out]	revisedLifetimeCount	Pointer for the revised lifetime count output value (optional)
[out]	revisedMaxKeepAliveCount	Pointer for the revised max keep alive count output value (optional)

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid subscription pointer, SOPC_STATUS_INVALID_STATE if the client or connection is not running.

SOPC_ClientHelperNew_Subscription_GetUserParam()

uintptr_t SOPC_ClientHelperNew_Subscription_GetUserParam

(

const SOPC_ClientHelper_Subscription *

subscription

)

Returns the user parameter defined in SOPC_ClientHelperNew_CreateSubscription.

Parameters

subscription

The subscription instance

Returns

User defined parameter provided in SOPC_ClientHelperNew_CreateSubscription for creation of subscription

SOPC_ClientHelperNew_GetSecureConnection()

SOPC_ClientConnection* SOPC_ClientHelperNew_GetSecureConnection

(

const SOPC_ClientHelper_Subscription *

subscription

)

Gets the secure connection on which the subscription rely on.

Parameters

subscription

The subscription instance

Returns

The secure connection instance

SOPC_ClientHelperNew_Subscription_CreateMonitoredItems()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_CreateMonitoredItems	(	const SOPC_ClientHelper_Subscription *	subscription,
		OpcUa_CreateMonitoredItemsRequest *	monitoredItemsReq,
		const uintptr_t *	monitoredItemCtxArray,
		OpcUa_CreateMonitoredItemsResponse *	monitoredItemsResp
	)

Creates new monitored items on the given subscription. A context array might be provided and context will be provided on notification for corresponding monitored item in notification callback. A pointer to empty message response might be provided to retrieve the creation result and monitored item id affected by the server (needed to modify or delete monitored items prior to subscription deletion)

Parameters

	subscription	The subscription instance on which monitored items shall be created
	monitoredItemsReq	The create monitored items requests to use for creation parameters. SubscriptionId and ClientHandle parameters are ignored and set automatically. Simplified way to create it is to use SOPC_CreateMonitoredItemsRequest_CreateDefault or SOPC_CreateMonitoredItemsRequest_CreateDefaultFromStrings.
	monitoredItemCtxArray	(optional) The array of context for monitored items to be created (might be freed by caller after call only content is recorded in subscription)
[out]	monitoredItemsResp	(optional) Pointer to the empty response that will be filled with the response received from the server and containing the status result and server monitored items ids.

SOPC_ClientHelperNew_Subscription_DeleteMonitoredItems()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_DeleteMonitoredItems	(	const SOPC_ClientHelper_Subscription *	subscription,
		OpcUa_DeleteMonitoredItemsRequest *	delMonitoredItemsReq,
		OpcUa_DeleteMonitoredItemsResponse *	delMonitoredItemsResp
	)

Deletes monitored items on the given subscription using the server monitored item ids. A pointer to empty message response might be provided to retrieve the deletion result.

Parameters

	subscription	The subscription instance on which monitored items shall be created
	delMonitoredItemsReq	The delete monitored items requests to use for creation parameters. SubscriptionId parameter is ignored and set automatically.
[out]	delMonitoredItemsResp	(optional) Pointer to the empty response that will be filled with the response received from the server and containing the status result.

SOPC_ClientHelperNew_Subscription_SyncService()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_SyncService	(	const SOPC_ClientHelper_Subscription *	subscription,
		void *	subOrMIrequest,
		void **	subOrMIresponse
	)

Executes an OPC UA service on server related to the given subscription synchronously.

Note

The subscription identifier part in the request provided is automatically set by this function.

The requests to create / delete subscription or monitored items are not supported since dedicated API function shall be used.

The transfer subscription service is not supported by client.

Parameters

	subscription	The subscription instance for which the service shall be executed
	subOrMIrequest	An instance of one of the following OPC UA request: OpcUa_ModifySubscriptionRequest OpcUa_SetPublishingModeRequest (expecting 1 subscription id to fill in allocated array) OpcUa_ModifyMonitoredItemsRequest OpcUa_SetMonitoringModeRequest OpcUa_SetTriggeringRequest
[out]	subOrMIresponse	Pointer into which instance of response complying with the OPC UA request is provided: OpcUa_ModifySubscriptionResponse OpcUa_SetPublishingModeResponse OpcUa_ModifyMonitoredItemsResponse OpcUa_SetMonitoringModeResponse OpcUa_SetTriggeringResponse In case of service failure the response type is always OpcUa_ServiceFault, in this case the response.encodeableType points to OpcUa_ServiceFault_EncodeableType and SOPC_IsGoodStatus(response.ResponseHeader.ServiceResult) is false.

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, SOPC_STATUS_INVALID_STATE if the client is not running. And dedicated status if request sending failed.

Note

request memory is managed by the client after a successful return or in case of timeout

caller is responsible of output response memory after successful call. E.g. use SOPC_Encodeable_Delete.

Warning

service synchronous call shall only be called from the application thread and shall not be called from client callbacks used for asynchronous response, connections event, etc. (SOPC_ServiceAsyncResp_Fct, SOPC_ClientConnectionEvent_Fct, etc.). Otherwise this will lead to a deadlock situation.

SOPC_ClientHelperNew_Subscription_AsyncService()

SOPC_ReturnStatus SOPC_ClientHelperNew_Subscription_AsyncService	(	const SOPC_ClientHelper_Subscription *	subscription,
		void *	subOrMIrequest,
		uintptr_t	userContext
	)

Executes an OPC UA service on server related to the given subscription asynchronously. Service response callback configured through SOPC_ClientConfigHelper_SetServiceAsyncResponse will be called on service response or in case of service request sending failure.

Note

The subscription identifier part in the request provided is automatically set by this function.

The requests to create / delete subscription or monitored items are not supported since dedicated API function shall be used.

The transfer subscription service is not supported by client.

Parameters

subscription	The subscription instance for which the service shall be executed
subOrMIrequest	An instance of one of the following OPC UA request: OpcUa_ModifySubscriptionRequest OpcUa_SetPublishingModeRequest (expecting 1 subscription id to fill in allocated array) OpcUa_ModifyMonitoredItemsRequest OpcUa_SetMonitoringModeRequest OpcUa_SetTriggeringRequest
userContext	User defined context that will be provided with the corresponding response in SOPC_LocalServiceAsyncResp_Fct

Returns

SOPC_STATUS_OK in case of success, SOPC_STATUS_INVALID_PARAMETERS in case of invalid parameters, otherwise SOPC_STATUS_INVALID_STATE if the client is not running.

Note

request memory is managed by the client after a successful return

Warning

Caller of this API should wait at least SOPC_REQUEST_TIMEOUT_MS milliseconds after calling this function and prior to call SOPC_ClientConfigHelper_Clear. It is necessary to ensure asynchronous context is freed and no memory leak occurs.