UpdateWillTopic Method

Update the will topic, will QoS and will retain flag stored in session state data by the server.

Syntax

ANSI (Cross Platform)
int UpdateWillTopic();

Unicode (Windows)
INT UpdateWillTopic();
- (void)updateWillTopic;
#define MID_MQTTSN_UPDATEWILLTOPIC 19

IPWORKSIOT_EXTERNAL int IPWORKSIOT_CALL IPWorksIoT_MQTTSN_Do(void *lpObj, int methid, int cparam, void *param[], int cbparam[], int64 *lpllVal);

Remarks

When this message is called, the value of WillTopic, WillQOS and WillRetain will be used to update the will message stored by the server.

This method may be called when these values are empty, in this case the server values will be cleared.

See UpdateWillMessage for more on updating will settings.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)
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IPWorks IoT 2020 C++ Edition - Version 20.0 [Build 8265]