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mosquitto.h
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mosquitto.h
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/*
Copyright (c) 2010-2014 Roger Light <[email protected]>
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
and Eclipse Distribution License v1.0 which accompany this distribution.
The Eclipse Public License is available at
http:https://www.eclipse.org/legal/epl-v10.html
and the Eclipse Distribution License is available at
http:https://www.eclipse.org/org/documents/edl-v10.php.
Contributors:
Roger Light - initial implementation and documentation.
*/
#ifndef _MOSQUITTO_H_
#define _MOSQUITTO_H_
#ifdef __cplusplus
extern "C" {
#endif
#if defined(WIN32) && !defined(WITH_BROKER)
# ifdef libmosquitto_EXPORTS
# define libmosq_EXPORT __declspec(dllexport)
# else
# define libmosq_EXPORT __declspec(dllimport)
# endif
#else
# define libmosq_EXPORT
#endif
#ifdef WIN32
# ifndef __cplusplus
# define bool char
# define true 1
# define false 0
# endif
#else
# ifndef __cplusplus
# include <stdbool.h>
# endif
#endif
#define LIBMOSQUITTO_MAJOR 1
#define LIBMOSQUITTO_MINOR 4
#define LIBMOSQUITTO_REVISION 8
/* LIBMOSQUITTO_VERSION_NUMBER looks like 1002001 for e.g. version 1.2.1. */
#define LIBMOSQUITTO_VERSION_NUMBER (LIBMOSQUITTO_MAJOR*1000000+LIBMOSQUITTO_MINOR*1000+LIBMOSQUITTO_REVISION)
/* Log types */
#define MOSQ_LOG_NONE 0x00
#define MOSQ_LOG_INFO 0x01
#define MOSQ_LOG_NOTICE 0x02
#define MOSQ_LOG_WARNING 0x04
#define MOSQ_LOG_ERR 0x08
#define MOSQ_LOG_DEBUG 0x10
#define MOSQ_LOG_SUBSCRIBE 0x20
#define MOSQ_LOG_UNSUBSCRIBE 0x40
#define MOSQ_LOG_WEBSOCKETS 0x80
#define MOSQ_LOG_ALL 0xFFFF
/* Error values */
enum mosq_err_t {
MOSQ_ERR_CONN_PENDING = -1,
MOSQ_ERR_SUCCESS = 0,
MOSQ_ERR_NOMEM = 1,
MOSQ_ERR_PROTOCOL = 2,
MOSQ_ERR_INVAL = 3,
MOSQ_ERR_NO_CONN = 4,
MOSQ_ERR_CONN_REFUSED = 5,
MOSQ_ERR_NOT_FOUND = 6,
MOSQ_ERR_CONN_LOST = 7,
MOSQ_ERR_TLS = 8,
MOSQ_ERR_PAYLOAD_SIZE = 9,
MOSQ_ERR_NOT_SUPPORTED = 10,
MOSQ_ERR_AUTH = 11,
MOSQ_ERR_ACL_DENIED = 12,
MOSQ_ERR_UNKNOWN = 13,
MOSQ_ERR_ERRNO = 14,
MOSQ_ERR_EAI = 15,
MOSQ_ERR_PROXY = 16
};
/* Error values */
enum mosq_opt_t {
MOSQ_OPT_PROTOCOL_VERSION = 1,
};
/* MQTT specification restricts client ids to a maximum of 23 characters */
#define MOSQ_MQTT_ID_MAX_LENGTH 23
#define MQTT_PROTOCOL_V31 3
#define MQTT_PROTOCOL_V311 4
struct mosquitto_message{
int mid;
char *topic;
void *payload;
int payloadlen;
int qos;
bool retain;
};
struct mosquitto;
/*
* Topic: Threads
* libmosquitto provides thread safe operation, with the exception of
* <mosquitto_lib_init> which is not thread safe.
*
* If your application uses threads you must use <mosquitto_threaded_set> to
* tell the library this is the case, otherwise it makes some optimisations
* for the single threaded case that may result in unexpected behaviour for
* the multi threaded case.
*/
/***************************************************
* Important note
*
* The following functions that deal with network operations will return
* MOSQ_ERR_SUCCESS on success, but this does not mean that the operation has
* taken place. An attempt will be made to write the network data, but if the
* socket is not available for writing at that time then the packet will not be
* sent. To ensure the packet is sent, call mosquitto_loop() (which must also
* be called to process incoming network data).
* This is especially important when disconnecting a client that has a will. If
* the broker does not receive the DISCONNECT command, it will assume that the
* client has disconnected unexpectedly and send the will.
*
* mosquitto_connect()
* mosquitto_disconnect()
* mosquitto_subscribe()
* mosquitto_unsubscribe()
* mosquitto_publish()
***************************************************/
/*
* Function: mosquitto_lib_version
*
* Can be used to obtain version information for the mosquitto library.
* This allows the application to compare the library version against the
* version it was compiled against by using the LIBMOSQUITTO_MAJOR,
* LIBMOSQUITTO_MINOR and LIBMOSQUITTO_REVISION defines.
*
* Parameters:
* major - an integer pointer. If not NULL, the major version of the
* library will be returned in this variable.
* minor - an integer pointer. If not NULL, the minor version of the
* library will be returned in this variable.
* revision - an integer pointer. If not NULL, the revision of the library will
* be returned in this variable.
*
* Returns:
* LIBMOSQUITTO_VERSION_NUMBER, which is a unique number based on the major,
* minor and revision values.
* See Also:
* <mosquitto_lib_cleanup>, <mosquitto_lib_init>
*/
libmosq_EXPORT int mosquitto_lib_version(int *major, int *minor, int *revision);
/*
* Function: mosquitto_lib_init
*
* Must be called before any other mosquitto functions.
*
* This function is *not* thread safe.
*
* Returns:
* MOSQ_ERR_SUCCESS - always
*
* See Also:
* <mosquitto_lib_cleanup>, <mosquitto_lib_version>
*/
libmosq_EXPORT int mosquitto_lib_init(void);
/*
* Function: mosquitto_lib_cleanup
*
* Call to free resources associated with the library.
*
* Returns:
* MOSQ_ERR_SUCCESS - always
*
* See Also:
* <mosquitto_lib_init>, <mosquitto_lib_version>
*/
libmosq_EXPORT int mosquitto_lib_cleanup(void);
/*
* Function: mosquitto_new
*
* Create a new mosquitto client instance.
*
* Parameters:
* id - String to use as the client id. If NULL, a random client id
* will be generated. If id is NULL, clean_session must be true.
* clean_session - set to true to instruct the broker to clean all messages
* and subscriptions on disconnect, false to instruct it to
* keep them. See the man page mqtt(7) for more details.
* Note that a client will never discard its own outgoing
* messages on disconnect. Calling <mosquitto_connect> or
* <mosquitto_reconnect> will cause the messages to be resent.
* Use <mosquitto_reinitialise> to reset a client to its
* original state.
* Must be set to true if the id parameter is NULL.
* obj - A user pointer that will be passed as an argument to any
* callbacks that are specified.
*
* Returns:
* Pointer to a struct mosquitto on success.
* NULL on failure. Interrogate errno to determine the cause for the failure:
* - ENOMEM on out of memory.
* - EINVAL on invalid input parameters.
*
* See Also:
* <mosquitto_reinitialise>, <mosquitto_destroy>, <mosquitto_user_data_set>
*/
libmosq_EXPORT struct mosquitto *mosquitto_new(const char *id, bool clean_session, void *obj);
/*
* Function: mosquitto_destroy
*
* Use to free memory associated with a mosquitto client instance.
*
* Parameters:
* mosq - a struct mosquitto pointer to free.
*
* See Also:
* <mosquitto_new>, <mosquitto_reinitialise>
*/
libmosq_EXPORT void mosquitto_destroy(struct mosquitto *mosq);
/*
* Function: mosquitto_reinitialise
*
* This function allows an existing mosquitto client to be reused. Call on a
* mosquitto instance to close any open network connections, free memory
* and reinitialise the client with the new parameters. The end result is the
* same as the output of <mosquitto_new>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* id - string to use as the client id. If NULL, a random client id
* will be generated. If id is NULL, clean_session must be true.
* clean_session - set to true to instruct the broker to clean all messages
* and subscriptions on disconnect, false to instruct it to
* keep them. See the man page mqtt(7) for more details.
* Must be set to true if the id parameter is NULL.
* obj - A user pointer that will be passed as an argument to any
* callbacks that are specified.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*
* See Also:
* <mosquitto_new>, <mosquitto_destroy>
*/
libmosq_EXPORT int mosquitto_reinitialise(struct mosquitto *mosq, const char *id, bool clean_session, void *obj);
/*
* Function: mosquitto_will_set
*
* Configure will information for a mosquitto instance. By default, clients do
* not have a will. This must be called before calling <mosquitto_connect>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* topic - the topic on which to publish the will.
* payloadlen - the size of the payload (bytes). Valid values are between 0 and
* 268,435,455.
* payload - pointer to the data to send. If payloadlen > 0 this must be a
* valid memory location.
* qos - integer value 0, 1 or 2 indicating the Quality of Service to be
* used for the will.
* retain - set to true to make the will a retained message.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_PAYLOAD_SIZE - if payloadlen is too large.
*/
libmosq_EXPORT int mosquitto_will_set(struct mosquitto *mosq, const char *topic, int payloadlen, const void *payload, int qos, bool retain);
/*
* Function: mosquitto_will_clear
*
* Remove a previously configured will. This must be called before calling
* <mosquitto_connect>.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
*/
libmosq_EXPORT int mosquitto_will_clear(struct mosquitto *mosq);
/*
* Function: mosquitto_username_pw_set
*
* Configure username and password for a mosquitton instance. This is only
* supported by brokers that implement the MQTT spec v3.1. By default, no
* username or password will be sent.
* If username is NULL, the password argument is ignored.
* This must be called before calling mosquitto_connect().
*
* This is must be called before calling <mosquitto_connect>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* username - the username to send as a string, or NULL to disable
* authentication.
* password - the password to send as a string. Set to NULL when username is
* valid in order to send just a username.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*/
libmosq_EXPORT int mosquitto_username_pw_set(struct mosquitto *mosq, const char *username, const char *password);
/*
* Function: mosquitto_connect
*
* Connect to an MQTT broker.
*
* Parameters:
* mosq - a valid mosquitto instance.
* host - the hostname or ip address of the broker to connect to.
* port - the network port to connect to. Usually 1883.
* keepalive - the number of seconds after which the broker should send a PING
* message to the client if no other messages have been exchanged
* in that time.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect_bind>, <mosquitto_connect_async>, <mosquitto_reconnect>, <mosquitto_disconnect>, <mosquitto_tls_set>
*/
libmosq_EXPORT int mosquitto_connect(struct mosquitto *mosq, const char *host, int port, int keepalive);
/*
* Function: mosquitto_connect_bind
*
* Connect to an MQTT broker. This extends the functionality of
* <mosquitto_connect> by adding the bind_address parameter. Use this function
* if you need to restrict network communication over a particular interface.
*
* Parameters:
* mosq - a valid mosquitto instance.
* host - the hostname or ip address of the broker to connect to.
* port - the network port to connect to. Usually 1883.
* keepalive - the number of seconds after which the broker should send a PING
* message to the client if no other messages have been exchanged
* in that time.
* bind_address - the hostname or ip address of the local network interface to
* bind to.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect>, <mosquitto_connect_async>, <mosquitto_connect_bind_async>
*/
libmosq_EXPORT int mosquitto_connect_bind(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address);
/*
* Function: mosquitto_connect_async
*
* Connect to an MQTT broker. This is a non-blocking call. If you use
* <mosquitto_connect_async> your client must use the threaded interface
* <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
* <mosquitto_connect> to connect the client.
*
* May be called before or after <mosquitto_loop_start>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* host - the hostname or ip address of the broker to connect to.
* port - the network port to connect to. Usually 1883.
* keepalive - the number of seconds after which the broker should send a PING
* message to the client if no other messages have been exchanged
* in that time.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect_bind_async>, <mosquitto_connect>, <mosquitto_reconnect>, <mosquitto_disconnect>, <mosquitto_tls_set>
*/
libmosq_EXPORT int mosquitto_connect_async(struct mosquitto *mosq, const char *host, int port, int keepalive);
/*
* Function: mosquitto_connect_bind_async
*
* Connect to an MQTT broker. This is a non-blocking call. If you use
* <mosquitto_connect_bind_async> your client must use the threaded interface
* <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
* <mosquitto_connect> to connect the client.
*
* This extends the functionality of <mosquitto_connect_async> by adding the
* bind_address parameter. Use this function if you need to restrict network
* communication over a particular interface.
*
* May be called before or after <mosquitto_loop_start>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* host - the hostname or ip address of the broker to connect to.
* port - the network port to connect to. Usually 1883.
* keepalive - the number of seconds after which the broker should send a PING
* message to the client if no other messages have been exchanged
* in that time.
* bind_address - the hostname or ip address of the local network interface to
* bind to.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect_async>, <mosquitto_connect>, <mosquitto_connect_bind>
*/
libmosq_EXPORT int mosquitto_connect_bind_async(struct mosquitto *mosq, const char *host, int port, int keepalive, const char *bind_address);
/*
* Function: mosquitto_connect_srv
*
* Connect to an MQTT broker. This is a non-blocking call. If you use
* <mosquitto_connect_async> your client must use the threaded interface
* <mosquitto_loop_start>. If you need to use <mosquitto_loop>, you must use
* <mosquitto_connect> to connect the client.
*
* This extends the functionality of <mosquitto_connect_async> by adding the
* bind_address parameter. Use this function if you need to restrict network
* communication over a particular interface.
*
* May be called before or after <mosquitto_loop_start>.
*
* Parameters:
* mosq - a valid mosquitto instance.
* host - the hostname or ip address of the broker to connect to.
* keepalive - the number of seconds after which the broker should send a PING
* message to the client if no other messages have been exchanged
* in that time.
* bind_address - the hostname or ip address of the local network interface to
* bind to.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect_async>, <mosquitto_connect>, <mosquitto_connect_bind>
*/
libmosq_EXPORT int mosquitto_connect_srv(struct mosquitto *mosq, const char *host, int keepalive, const char *bind_address);
/*
* Function: mosquitto_reconnect
*
* Reconnect to a broker.
*
* This function provides an easy way of reconnecting to a broker after a
* connection has been lost. It uses the values that were provided in the
* <mosquitto_connect> call. It must not be called before
* <mosquitto_connect>.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect>, <mosquitto_disconnect>, <mosquitto_reconnect_async>
*/
libmosq_EXPORT int mosquitto_reconnect(struct mosquitto *mosq);
/*
* Function: mosquitto_reconnect_async
*
* Reconnect to a broker. Non blocking version of <mosquitto_reconnect>.
*
* This function provides an easy way of reconnecting to a broker after a
* connection has been lost. It uses the values that were provided in the
* <mosquitto_connect> or <mosquitto_connect_async> calls. It must not be
* called before <mosquitto_connect>.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_connect>, <mosquitto_disconnect>
*/
libmosq_EXPORT int mosquitto_reconnect_async(struct mosquitto *mosq);
/*
* Function: mosquitto_disconnect
*
* Disconnect from the broker.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
*/
libmosq_EXPORT int mosquitto_disconnect(struct mosquitto *mosq);
/*
* Function: mosquitto_publish
*
* Publish a message on a given topic.
*
* Parameters:
* mosq - a valid mosquitto instance.
* mid - pointer to an int. If not NULL, the function will set this
* to the message id of this particular message. This can be then
* used with the publish callback to determine when the message
* has been sent.
* Note that although the MQTT protocol doesn't use message ids
* for messages with QoS=0, libmosquitto assigns them message ids
* so they can be tracked with this parameter.
* topic - null terminated string of the topic to publish to.
* payloadlen - the size of the payload (bytes). Valid values are between 0 and
* 268,435,455.
* payload - pointer to the data to send. If payloadlen > 0 this must be a
* valid memory location.
* qos - integer value 0, 1 or 2 indicating the Quality of Service to be
* used for the message.
* retain - set to true to make the message retained.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
* MOSQ_ERR_PROTOCOL - if there is a protocol error communicating with the
* broker.
* MOSQ_ERR_PAYLOAD_SIZE - if payloadlen is too large.
*
* See Also:
* <mosquitto_max_inflight_messages_set>
*/
libmosq_EXPORT int mosquitto_publish(struct mosquitto *mosq, int *mid, const char *topic, int payloadlen, const void *payload, int qos, bool retain);
/*
* Function: mosquitto_subscribe
*
* Subscribe to a topic.
*
* Parameters:
* mosq - a valid mosquitto instance.
* mid - a pointer to an int. If not NULL, the function will set this to
* the message id of this particular message. This can be then used
* with the subscribe callback to determine when the message has been
* sent.
* sub - the subscription pattern.
* qos - the requested Quality of Service for this subscription.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
*/
libmosq_EXPORT int mosquitto_subscribe(struct mosquitto *mosq, int *mid, const char *sub, int qos);
/*
* Function: mosquitto_unsubscribe
*
* Unsubscribe from a topic.
*
* Parameters:
* mosq - a valid mosquitto instance.
* mid - a pointer to an int. If not NULL, the function will set this to
* the message id of this particular message. This can be then used
* with the unsubscribe callback to determine when the message has been
* sent.
* sub - the unsubscription pattern.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
*/
libmosq_EXPORT int mosquitto_unsubscribe(struct mosquitto *mosq, int *mid, const char *sub);
/*
* Function: mosquitto_message_copy
*
* Copy the contents of a mosquitto message to another message.
* Useful for preserving a message received in the on_message() callback.
*
* Parameters:
* dst - a pointer to a valid mosquitto_message struct to copy to.
* src - a pointer to a valid mosquitto_message struct to copy from.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*
* See Also:
* <mosquitto_message_free>
*/
libmosq_EXPORT int mosquitto_message_copy(struct mosquitto_message *dst, const struct mosquitto_message *src);
/*
* Function: mosquitto_message_free
*
* Completely free a mosquitto_message struct.
*
* Parameters:
* message - pointer to a mosquitto_message pointer to free.
*
* See Also:
* <mosquitto_message_copy>
*/
libmosq_EXPORT void mosquitto_message_free(struct mosquitto_message **message);
/*
* Function: mosquitto_loop
*
* The main network loop for the client. You must call this frequently in order
* to keep communications between the client and broker working. If incoming
* data is present it will then be processed. Outgoing commands, from e.g.
* <mosquitto_publish>, are normally sent immediately that their function is
* called, but this is not always possible. <mosquitto_loop> will also attempt
* to send any remaining outgoing messages, which also includes commands that
* are part of the flow for messages with QoS>0.
*
* An alternative approach is to use <mosquitto_loop_start> to run the client
* loop in its own thread.
*
* This calls select() to monitor the client network socket. If you want to
* integrate mosquitto client operation with your own select() call, use
* <mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write> and
* <mosquitto_loop_misc>.
*
* Threads:
*
* Parameters:
* mosq - a valid mosquitto instance.
* timeout - Maximum number of milliseconds to wait for network activity
* in the select() call before timing out. Set to 0 for instant
* return. Set negative to use the default of 1000ms.
* max_packets - this parameter is currently unused and should be set to 1 for
* future compatibility.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
* MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
* MOSQ_ERR_PROTOCOL - if there is a protocol error communicating with the
* broker.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
* See Also:
* <mosquitto_loop_forever>, <mosquitto_loop_start>, <mosquitto_loop_stop>
*/
libmosq_EXPORT int mosquitto_loop(struct mosquitto *mosq, int timeout, int max_packets);
/*
* Function: mosquitto_loop_forever
*
* This function call loop() for you in an infinite blocking loop. It is useful
* for the case where you only want to run the MQTT client loop in your
* program.
*
* It handles reconnecting in case server connection is lost. If you call
* mosquitto_disconnect() in a callback it will return.
*
* Parameters:
* mosq - a valid mosquitto instance.
* timeout - Maximum number of milliseconds to wait for network activity
* in the select() call before timing out. Set to 0 for instant
* return. Set negative to use the default of 1000ms.
* max_packets - this parameter is currently unused and should be set to 1 for
* future compatibility.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
* MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
* MOSQ_ERR_PROTOCOL - if there is a protocol error communicating with the
* broker.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_loop>, <mosquitto_loop_start>
*/
libmosq_EXPORT int mosquitto_loop_forever(struct mosquitto *mosq, int timeout, int max_packets);
/*
* Function: mosquitto_loop_start
*
* This is part of the threaded client interface. Call this once to start a new
* thread to process network traffic. This provides an alternative to
* repeatedly calling <mosquitto_loop> yourself.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOT_SUPPORTED - if thread support is not available.
*
* See Also:
* <mosquitto_connect_async>, <mosquitto_loop>, <mosquitto_loop_forever>, <mosquitto_loop_stop>
*/
libmosq_EXPORT int mosquitto_loop_start(struct mosquitto *mosq);
/*
* Function: mosquitto_loop_stop
*
* This is part of the threaded client interface. Call this once to stop the
* network thread previously created with <mosquitto_loop_start>. This call
* will block until the network thread finishes. For the network thread to end,
* you must have previously called <mosquitto_disconnect> or have set the force
* parameter to true.
*
* Parameters:
* mosq - a valid mosquitto instance.
* force - set to true to force thread cancellation. If false,
* <mosquitto_disconnect> must have already been called.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOT_SUPPORTED - if thread support is not available.
*
* See Also:
* <mosquitto_loop>, <mosquitto_loop_start>
*/
libmosq_EXPORT int mosquitto_loop_stop(struct mosquitto *mosq, bool force);
/*
* Function: mosquitto_socket
*
* Return the socket handle for a mosquitto instance. Useful if you want to
* include a mosquitto client in your own select() calls.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* The socket for the mosquitto client or -1 on failure.
*/
libmosq_EXPORT int mosquitto_socket(struct mosquitto *mosq);
/*
* Function: mosquitto_loop_read
*
* Carry out network read operations.
* This should only be used if you are not using mosquitto_loop() and are
* monitoring the client network socket for activity yourself.
*
* Parameters:
* mosq - a valid mosquitto instance.
* max_packets - this parameter is currently unused and should be set to 1 for
* future compatibility.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
* MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
* MOSQ_ERR_PROTOCOL - if there is a protocol error communicating with the
* broker.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_socket>, <mosquitto_loop_write>, <mosquitto_loop_misc>
*/
libmosq_EXPORT int mosquitto_loop_read(struct mosquitto *mosq, int max_packets);
/*
* Function: mosquitto_loop_write
*
* Carry out network write operations.
* This should only be used if you are not using mosquitto_loop() and are
* monitoring the client network socket for activity yourself.
*
* Parameters:
* mosq - a valid mosquitto instance.
* max_packets - this parameter is currently unused and should be set to 1 for
* future compatibility.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
* MOSQ_ERR_CONN_LOST - if the connection to the broker was lost.
* MOSQ_ERR_PROTOCOL - if there is a protocol error communicating with the
* broker.
* MOSQ_ERR_ERRNO - if a system call returned an error. The variable errno
* contains the error code, even on Windows.
* Use strerror_r() where available or FormatMessage() on
* Windows.
*
* See Also:
* <mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_misc>, <mosquitto_want_write>
*/
libmosq_EXPORT int mosquitto_loop_write(struct mosquitto *mosq, int max_packets);
/*
* Function: mosquitto_loop_misc
*
* Carry out miscellaneous operations required as part of the network loop.
* This should only be used if you are not using mosquitto_loop() and are
* monitoring the client network socket for activity yourself.
*
* This function deals with handling PINGs and checking whether messages need
* to be retried, so should be called fairly frequently.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NO_CONN - if the client isn't connected to a broker.
*
* See Also:
* <mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write>
*/
libmosq_EXPORT int mosquitto_loop_misc(struct mosquitto *mosq);
/*
* Function: mosquitto_want_write
*
* Returns true if there is data ready to be written on the socket.
*
* Parameters:
* mosq - a valid mosquitto instance.
*
* See Also:
* <mosquitto_socket>, <mosquitto_loop_read>, <mosquitto_loop_write>
*/
libmosq_EXPORT bool mosquitto_want_write(struct mosquitto *mosq);
/*
* Function: mosquitto_threaded_set
*
* Used to tell the library that your application is using threads, but not
* using <mosquitto_loop_start>. The library operates slightly differently when
* not in threaded mode in order to simplify its operation. If you are managing
* your own threads and do not use this function you will experience crashes
* due to race conditions.
*
* When using <mosquitto_loop_start>, this is set automatically.
*
* Parameters:
* mosq - a valid mosquitto instance.
* threaded - true if your application is using threads, false otherwise.
*/
libmosq_EXPORT int mosquitto_threaded_set(struct mosquitto *mosq, bool threaded);
/*
* Function: mosquitto_opts_set
*
* Used to set options for the client.
*
* Parameters:
* mosq - a valid mosquitto instance.
* option - the option to set.
* value - the option specific value.
*
* Options:
* MOSQ_OPT_PROTOCOL_VERSION - value must be an int, set to either
* MQTT_PROTOCOL_V31 or MQTT_PROTOCOL_V311. Must
* be set before the client connects. Defaults to
* MQTT_PROTOCOL_V31.
*/
libmosq_EXPORT int mosquitto_opts_set(struct mosquitto *mosq, enum mosq_opt_t option, void *value);
/*
* Function: mosquitto_tls_set
*
* Configure the client for certificate based SSL/TLS support. Must be called
* before <mosquitto_connect>.
*
* Cannot be used in conjunction with <mosquitto_tls_psk_set>.
*
* Define the Certificate Authority certificates to be trusted (ie. the server
* certificate must be signed with one of these certificates) using cafile.
*
* If the server you are connecting to requires clients to provide a
* certificate, define certfile and keyfile with your client certificate and
* private key. If your private key is encrypted, provide a password callback
* function or you will have to enter the password at the command line.
*
* Parameters:
* mosq - a valid mosquitto instance.
* cafile - path to a file containing the PEM encoded trusted CA
* certificate files. Either cafile or capath must not be NULL.
* capath - path to a directory containing the PEM encoded trusted CA
* certificate files. See mosquitto.conf for more details on
* configuring this directory. Either cafile or capath must not
* be NULL.
* certfile - path to a file containing the PEM encoded certificate file
* for this client. If NULL, keyfile must also be NULL and no
* client certificate will be used.
* keyfile - path to a file containing the PEM encoded private key for
* this client. If NULL, certfile must also be NULL and no
* client certificate will be used.
* pw_callback - if keyfile is encrypted, set pw_callback to allow your client
* to pass the correct password for decryption. If set to NULL,
* the password must be entered on the command line.
* Your callback must write the password into "buf", which is
* "size" bytes long. The return value must be the length of the
* password. "userdata" will be set to the calling mosquitto
* instance.
*
* Returns:
* MOSQ_ERR_SUCCESS - on success.
* MOSQ_ERR_INVAL - if the input parameters were invalid.
* MOSQ_ERR_NOMEM - if an out of memory condition occurred.
*
* See Also:
* <mosquitto_tls_opts_set>, <mosquitto_tls_psk_set>, <mosquitto_tls_insecure_set>
*/
libmosq_EXPORT int mosquitto_tls_set(struct mosquitto *mosq,
const char *cafile, const char *capath,
const char *certfile, const char *keyfile,
int (*pw_callback)(char *buf, int size, int rwflag, void *userdata));