Functions
NT_Topic *	NT_GetTopics (NT_Inst inst, const char prefix, size_t prefix_len, unsigned int types, size_t count)
	Get Published Topic Handles. More...

NT_Topic *	NT_GetTopicsStr (NT_Inst inst, const char prefix, size_t prefix_len, const char const types, size_t types_len, size_t count)
	Get Published Topic Handles. More...

struct NT_TopicInfo *	NT_GetTopicInfos (NT_Inst inst, const char prefix, size_t prefix_len, unsigned int types, size_t count)
	Get Topics. More...

struct NT_TopicInfo *	NT_GetTopicInfosStr (NT_Inst inst, const char prefix, size_t prefix_len, const char const types, size_t types_len, size_t count)
	Get Topics. More...

NT_Bool	NT_GetTopicInfo (NT_Topic topic, struct NT_TopicInfo *info)
	Gets Topic Information. More...

NT_Topic	NT_GetTopic (NT_Inst inst, const char *name, size_t name_len)
	Gets Topic Handle. More...

char *	NT_GetTopicName (NT_Topic topic, size_t *name_len)
	Gets the name of the specified topic. More...

enum NT_Type	NT_GetTopicType (NT_Topic topic)
	Gets the type for the specified topic, or unassigned if non existent. More...

char *	NT_GetTopicTypeString (NT_Topic topic, size_t *type_len)
	Gets the type string for the specified topic. More...

void	NT_SetTopicPersistent (NT_Topic topic, NT_Bool value)
	Sets the persistent property of a topic. More...

NT_Bool	NT_GetTopicPersistent (NT_Topic topic)
	Gets the persistent property of a topic. More...

void	NT_SetTopicRetained (NT_Topic topic, NT_Bool value)
	Sets the retained property of a topic. More...

NT_Bool	NT_GetTopicRetained (NT_Topic topic)
	Gets the retained property of a topic. More...

NT_Bool	NT_GetTopicExists (NT_Handle handle)
	Determine if topic exists (e.g. More...

char *	NT_GetTopicProperty (NT_Topic topic, const char name, size_t len)
	Gets the current value of a property (as a JSON string). More...

NT_Bool	NT_SetTopicProperty (NT_Topic topic, const char name, const char value)
	Sets a property value. More...

void	NT_DeleteTopicProperty (NT_Topic topic, const char *name)
	Deletes a property. More...

char *	NT_GetTopicProperties (NT_Topic topic, size_t *len)
	Gets all topic properties as a JSON string. More...

NT_Bool	NT_SetTopicProperties (NT_Topic topic, const char *properties)
	Updates multiple topic properties. More...

NT_Subscriber	NT_Subscribe (NT_Topic topic, enum NT_Type type, const char typeStr, const struct NT_PubSubOptions options)
	Creates a new subscriber to value changes on a topic. More...

void	NT_Unsubscribe (NT_Subscriber sub)
	Stops subscriber. More...

NT_Publisher	NT_Publish (NT_Topic topic, enum NT_Type type, const char typeStr, const struct NT_PubSubOptions options)
	Creates a new publisher to a topic. More...

NT_Publisher	NT_PublishEx (NT_Topic topic, enum NT_Type type, const char typeStr, const char properties, const struct NT_PubSubOptions *options)
	Creates a new publisher to a topic. More...

void	NT_Unpublish (NT_Handle pubentry)
	Stops publisher. More...

NT_Entry	NT_GetEntryEx (NT_Topic topic, enum NT_Type type, const char typeStr, const struct NT_PubSubOptions options)
	Creates a new entry (subscriber and weak publisher) to a topic. More...

void	NT_ReleaseEntry (NT_Entry entry)
	Stops entry subscriber/publisher. More...

void	NT_Release (NT_Handle pubsubentry)
	Stops entry/subscriber/publisher. More...

NT_Topic	NT_GetTopicFromHandle (NT_Handle pubsubentry)
	Gets the topic handle from an entry/subscriber/publisher handle. More...

Detailed Description

Function Documentation

◆ NT_DeleteTopicProperty()

void NT_DeleteTopicProperty	(	NT_Topic	topic,
		const char *	name
	)

Deletes a property.

Has no effect if the property does not exist.

Parameters

topic	topic handle
name	property name

◆ NT_GetEntryEx()

NT_Entry NT_GetEntryEx	(	NT_Topic	topic,
		enum NT_Type	type,
		const char *	typeStr,
		const struct NT_PubSubOptions *	options
	)

Creates a new entry (subscriber and weak publisher) to a topic.

Parameters

topic	topic handle
type	type
typeStr	type string
options	publish options

Returns: Entry handle

◆ NT_GetTopic()

NT_Topic NT_GetTopic	(	NT_Inst	inst,
		const char *	name,
		size_t	name_len
	)

Gets Topic Handle.

Returns topic handle.

Parameters

inst	instance handle
name	topic name
name_len	length of topic name in bytes

Returns: Topic handle.

◆ NT_GetTopicExists()

NT_Bool NT_GetTopicExists ( NT_Handle handle )

Determine if topic exists (e.g.

has at least one publisher).

Parameters

handle Topic, entry, or subscriber handle.

Returns: True if topic exists.

◆ NT_GetTopicFromHandle()

NT_Topic NT_GetTopicFromHandle ( NT_Handle pubsubentry )

Gets the topic handle from an entry/subscriber/publisher handle.

Parameters

pubsubentry entry/subscriber/publisher handle

Returns: Topic handle

◆ NT_GetTopicInfo()

NT_Bool NT_GetTopicInfo	(	NT_Topic	topic,
		struct NT_TopicInfo *	info
	)

Gets Topic Information.

Returns information about a topic (name and type).

Parameters

topic	handle
info	information (output)

Returns: True if successful, false on error.

◆ NT_GetTopicInfos()

struct NT_TopicInfo * NT_GetTopicInfos	(	NT_Inst	inst,
		const char *	prefix,
		size_t	prefix_len,
		unsigned int	types,
		size_t *	count
	)

Get Topics.

Returns an array of topic information (handle, name, type). The results are optionally filtered by string prefix and type to only return a subset of all topics.

Parameters

inst	instance handle
prefix	name required prefix; only topics whose name starts with this string are returned
prefix_len	length of prefix in bytes
types	bitmask of NT_Type values; 0 is treated specially as a "don't care"
count	output parameter; set to length of returned array

Returns: Array of topic information.

◆ NT_GetTopicInfosStr()

struct NT_TopicInfo * NT_GetTopicInfosStr	(	NT_Inst	inst,
		const char *	prefix,
		size_t	prefix_len,
		const char const	types,
		size_t	types_len,
		size_t *	count
	)

Get Topics.

Returns an array of topic information (handle, name, type). The results are optionally filtered by string prefix and type to only return a subset of all topics.

Parameters

inst	instance handle
prefix	name required prefix; only topics whose name starts with this string are returned
prefix_len	length of prefix in bytes
types	array of type strings
types_len	number of elements in types array
count	output parameter; set to length of returned array

Returns: Array of topic information.

◆ NT_GetTopicName()

char * NT_GetTopicName	(	NT_Topic	topic,
		size_t *	name_len
	)

Gets the name of the specified topic.

Parameters

topic	topic handle
name_len	length of topic name (output)

Returns: Topic name; returns NULL and name_len=0 if the handle is invalid.

◆ NT_GetTopicPersistent()

NT_Bool NT_GetTopicPersistent ( NT_Topic topic )

Gets the persistent property of a topic.

Parameters

topic topic handle

Returns: persistent property value

◆ NT_GetTopicProperties()

char * NT_GetTopicProperties	(	NT_Topic	topic,
		size_t *	len
	)

Gets all topic properties as a JSON string.

Each key in the object is the property name, and the corresponding value is the property value.

Parameters

topic	topic handle
len	length of returned string (output)

Returns: JSON string

◆ NT_GetTopicProperty()

char * NT_GetTopicProperty	(	NT_Topic	topic,
		const char *	name,
		size_t *	len
	)

Gets the current value of a property (as a JSON string).

Parameters

topic	topic handle
name	property name
len	length of returned string (output)

Returns: JSON string; empty string if the property does not exist.

◆ NT_GetTopicRetained()

NT_Bool NT_GetTopicRetained ( NT_Topic topic )

Gets the retained property of a topic.

Parameters

topic topic handle

Returns: retained property value

◆ NT_GetTopics()

NT_Topic * NT_GetTopics	(	NT_Inst	inst,
		const char *	prefix,
		size_t	prefix_len,
		unsigned int	types,
		size_t *	count
	)

Get Published Topic Handles.

Returns an array of topic handles. The results are optionally filtered by string prefix and type to only return a subset of all topics.

Parameters

inst	instance handle
prefix	name required prefix; only topics whose name starts with this string are returned
prefix_len	length of prefix in bytes
types	bitmask of NT_Type values; 0 is treated specially as a "don't care"
count	output parameter; set to length of returned array

Returns: Array of topic handles.

◆ NT_GetTopicsStr()

NT_Topic * NT_GetTopicsStr	(	NT_Inst	inst,
		const char *	prefix,
		size_t	prefix_len,
		const char const	types,
		size_t	types_len,
		size_t *	count
	)

Get Published Topic Handles.

Returns an array of topic handles. The results are optionally filtered by string prefix and type to only return a subset of all topics.

Parameters

inst	instance handle
prefix	name required prefix; only topics whose name starts with this string are returned
prefix_len	length of prefix in bytes
types	array of type strings
types_len	number of elements in types array
count	output parameter; set to length of returned array

Returns: Array of topic handles.

◆ NT_GetTopicType()

enum NT_Type NT_GetTopicType ( NT_Topic topic )

Gets the type for the specified topic, or unassigned if non existent.

Parameters

topic topic handle

Returns: Topic type

◆ NT_GetTopicTypeString()

char * NT_GetTopicTypeString	(	NT_Topic	topic,
		size_t *	type_len
	)

Gets the type string for the specified topic.

This may have more information than the numeric type (especially for raw values).

Parameters

topic	topic handle
type_len	length of type string (output)

Returns: Topic type string; returns NULL if non-existent

◆ NT_Publish()

NT_Publisher NT_Publish	(	NT_Topic	topic,
		enum NT_Type	type,
		const char *	typeStr,
		const struct NT_PubSubOptions *	options
	)

Creates a new publisher to a topic.

Parameters

topic	topic handle
type	type
typeStr	type string
options	publish options

Returns: Publisher handle

◆ NT_PublishEx()

NT_Publisher NT_PublishEx	(	NT_Topic	topic,
		enum NT_Type	type,
		const char *	typeStr,
		const char *	properties,
		const struct NT_PubSubOptions *	options
	)

Creates a new publisher to a topic.

Parameters

topic	topic handle
type	type
typeStr	type string
properties	initial properties (JSON object)
options	publish options

Returns: Publisher handle

◆ NT_Release()

void NT_Release ( NT_Handle pubsubentry )

Stops entry/subscriber/publisher.

Parameters

pubsubentry entry/subscriber/publisher handle

◆ NT_ReleaseEntry()

void NT_ReleaseEntry ( NT_Entry entry )

Stops entry subscriber/publisher.

Parameters

entry entry handle

◆ NT_SetTopicPersistent()

void NT_SetTopicPersistent	(	NT_Topic	topic,
		NT_Bool	value
	)

Sets the persistent property of a topic.

If true, the stored value is persistent through server restarts.

Parameters

topic	topic handle
value	True for persistent, false for not persistent.

◆ NT_SetTopicProperties()

NT_Bool NT_SetTopicProperties	(	NT_Topic	topic,
		const char *	properties
	)

Updates multiple topic properties.

Each key in the passed-in JSON object is the name of the property to add/update, and the corresponding value is the property value to set for that property. Null values result in deletion of the corresponding property.

Parameters

topic	topic handle
properties	JSON object string with keys to add/update/delete

Returns: False if properties are not a valid JSON object

◆ NT_SetTopicProperty()

NT_Bool NT_SetTopicProperty	(	NT_Topic	topic,
		const char *	name,
		const char *	value
	)

Sets a property value.

Parameters

topic	topic handle
name	property name
value	property value (JSON string)

◆ NT_SetTopicRetained()

void NT_SetTopicRetained	(	NT_Topic	topic,
		NT_Bool	value
	)

Sets the retained property of a topic.

If true, the server retains the topic even when there are no publishers.

Parameters

topic	topic handle
value	new retained property value

◆ NT_Subscribe()

NT_Subscriber NT_Subscribe	(	NT_Topic	topic,
		enum NT_Type	type,
		const char *	typeStr,
		const struct NT_PubSubOptions *	options
	)

Creates a new subscriber to value changes on a topic.

Parameters

topic	topic handle
type	expected type
typeStr	expected type string
options	subscription options

Returns: Subscriber handle

◆ NT_Unpublish()

void NT_Unpublish ( NT_Handle pubentry )

Stops publisher.

Parameters

pubentry publisher/entry handle

◆ NT_Unsubscribe()

void NT_Unsubscribe ( NT_Subscriber sub )

Stops subscriber.

Parameters

sub	subscriber handle

Functions

Detailed Description

Function Documentation

◆ NT_DeleteTopicProperty()

◆ NT_GetEntryEx()

◆ NT_GetTopic()

◆ NT_GetTopicExists()

◆ NT_GetTopicFromHandle()

◆ NT_GetTopicInfo()

◆ NT_GetTopicInfos()

◆ NT_GetTopicInfosStr()

◆ NT_GetTopicName()

◆ NT_GetTopicPersistent()

◆ NT_GetTopicProperties()

◆ NT_GetTopicProperty()

◆ NT_GetTopicRetained()

◆ NT_GetTopics()

◆ NT_GetTopicsStr()

◆ NT_GetTopicType()

◆ NT_GetTopicTypeString()

◆ NT_Publish()

◆ NT_PublishEx()

◆ NT_Release()

◆ NT_ReleaseEntry()

◆ NT_SetTopicPersistent()

◆ NT_SetTopicProperties()

◆ NT_SetTopicProperty()

◆ NT_SetTopicRetained()

◆ NT_Subscribe()

◆ NT_Unpublish()

◆ NT_Unsubscribe()