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managed_components/espressif__mdns/include/mdns.h
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/*
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ESP_MDNS_H_
#define ESP_MDNS_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "sdkconfig.h"
#include <esp_netif.h>
#define MDNS_TYPE_A 0x0001
#define MDNS_TYPE_PTR 0x000C
#define MDNS_TYPE_TXT 0x0010
#define MDNS_TYPE_AAAA 0x001C
#define MDNS_TYPE_SRV 0x0021
#define MDNS_TYPE_OPT 0x0029
#define MDNS_TYPE_NSEC 0x002F
#define MDNS_TYPE_ANY 0x00FF
#if defined(CONFIG_LWIP_IPV6) && defined(CONFIG_MDNS_RESPOND_REVERSE_QUERIES)
#define MDNS_NAME_MAX_LEN (64+4) // Need to account for IPv6 reverse queries (64 char address + ".ip6" )
#else
#define MDNS_NAME_MAX_LEN 64 // Maximum string length of hostname, instance, service and proto
#endif
#define MDNS_NAME_BUF_LEN (MDNS_NAME_MAX_LEN+1) // Maximum char buffer size to hold hostname, instance, service or proto
/**
* @brief Asynchronous query handle
*/
typedef struct mdns_search_once_s mdns_search_once_t;
/**
* @brief Daemon query handle
*/
typedef struct mdns_browse_s mdns_browse_t;
typedef enum {
MDNS_EVENT_ENABLE_IP4 = 1 << 1,
MDNS_EVENT_ENABLE_IP6 = 1 << 2,
MDNS_EVENT_ANNOUNCE_IP4 = 1 << 3,
MDNS_EVENT_ANNOUNCE_IP6 = 1 << 4,
MDNS_EVENT_DISABLE_IP4 = 1 << 5,
MDNS_EVENT_DISABLE_IP6 = 1 << 6,
MDNS_EVENT_IP4_REVERSE_LOOKUP = 1 << 7,
MDNS_EVENT_IP6_REVERSE_LOOKUP = 1 << 8,
} mdns_event_actions_t;
/**
* @brief mDNS enum to specify the ip_protocol type
*/
typedef enum {
MDNS_IP_PROTOCOL_V4,
MDNS_IP_PROTOCOL_V6,
MDNS_IP_PROTOCOL_MAX
} mdns_ip_protocol_t;
/**
* @brief mDNS basic text item structure
* Used in mdns_service_add()
*/
typedef struct {
const char *key; /*!< item key name */
const char *value; /*!< item value string */
} mdns_txt_item_t;
/**
* @brief mDNS basic subtype item structure
* Used in mdns_service_subtype_xxx() APIs
*/
typedef struct {
const char *subtype; /*!< subtype name */
} mdns_subtype_item_t;
/**
* @brief mDNS query linked list IP item
*/
typedef struct mdns_ip_addr_s {
esp_ip_addr_t addr; /*!< IP address */
struct mdns_ip_addr_s *next; /*!< next IP, or NULL for the last IP in the list */
} mdns_ip_addr_t;
/**
* @brief mDNS query type to be explicitly set to either Unicast or Multicast
*/
typedef enum {
MDNS_QUERY_UNICAST,
MDNS_QUERY_MULTICAST,
} mdns_query_transmission_type_t;
/**
* @brief mDNS query result structure
*/
typedef struct mdns_result_s {
struct mdns_result_s *next; /*!< next result, or NULL for the last result in the list */
esp_netif_t *esp_netif; /*!< ptr to corresponding esp-netif */
uint32_t ttl; /*!< time to live */
mdns_ip_protocol_t ip_protocol; /*!< ip_protocol type of the interface (v4/v6) */
// PTR
char *instance_name; /*!< instance name */
char *service_type; /*!< service type */
char *proto; /*!< srevice protocol */
// SRV
char *hostname; /*!< hostname */
uint16_t port; /*!< service port */
// TXT
mdns_txt_item_t *txt; /*!< txt record */
uint8_t *txt_value_len; /*!< array of txt value len of each record */
size_t txt_count; /*!< number of txt items */
// A and AAAA
mdns_ip_addr_t *addr; /*!< linked list of IP addresses found */
} mdns_result_t;
typedef void (*mdns_query_notify_t)(mdns_search_once_t *search);
typedef void (*mdns_browse_notify_t)(mdns_result_t *result);
/**
* @brief Initialize mDNS on given interface
*
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE when failed to register event handler
* - ESP_ERR_NO_MEM on memory error
* - ESP_FAIL when failed to start mdns task
*/
esp_err_t mdns_init(void);
/**
* @brief Stop and free mDNS server
*
*/
void mdns_free(void);
/**
* @brief Set the hostname for mDNS server
* required if you want to advertise services
*
* @param hostname Hostname to set
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_hostname_set(const char *hostname);
/**
* @brief Get the hostname for mDNS server
*
* @param hostname pointer to the hostname, it should be allocated
* and hold at least MDNS_NAME_BUF_LEN chars
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE when mdns is not initialized
*/
esp_err_t mdns_hostname_get(char *hostname);
/**
* @brief Adds a hostname and address to be delegated
* A/AAAA queries will be replied for the hostname and
* services can be added to this host.
*
* @param hostname Hostname to add
* @param address_list The IP address list of the host
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
*
*/
esp_err_t mdns_delegate_hostname_add(const char *hostname, const mdns_ip_addr_t *address_list);
/**
* @brief Set the address to a delegated hostname
*
* @param hostname Hostname to set
* @param address_list The IP address list of the host
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
*
*/
esp_err_t mdns_delegate_hostname_set_address(const char *hostname, const mdns_ip_addr_t *address_list);
/**
* @brief Remove a delegated hostname
* All the services added to this host will also be removed.
*
* @param hostname Hostname to remove
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
*
*/
esp_err_t mdns_delegate_hostname_remove(const char *hostname);
/**
* @brief Query whether a hostname has been added
*
* @param hostname Hostname to query
*
* @return
* - true The hostname has been added.
* - false The hostname has not been added.
*
*/
bool mdns_hostname_exists(const char *hostname);
/**
* @brief Set the default instance name for mDNS server
*
* @param instance_name Instance name to set
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_instance_name_set(const char *instance_name);
/**
* @brief Add service to mDNS server
*
* @note The value length of txt items will be automatically decided by strlen
*
* @param instance_name instance name to set. If NULL,
* global instance name or hostname will be used.
* Note that MDNS_MULTIPLE_INSTANCE config option
* needs to be enabled for adding multiple instances
* with the same instance type.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param port service port
* @param txt string array of TXT data (eg. {{"var","val"},{"other","2"}})
* @param num_items number of items in TXT data
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
* - ESP_FAIL failed to add service
*/
esp_err_t mdns_service_add(const char *instance_name, const char *service_type, const char *proto, uint16_t port, mdns_txt_item_t txt[], size_t num_items);
/**
* @brief Add service to mDNS server with a delegated hostname
*
* @note The value length of txt items will be automatically decided by strlen
*
* @param instance_name instance name to set. If NULL,
* global instance name or hostname will be used
* Note that MDNS_MULTIPLE_INSTANCE config option
* needs to be enabled for adding multiple instances
* with the same instance type.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param port service port
* @param txt string array of TXT data (eg. {{"var","val"},{"other","2"}})
* @param num_items number of items in TXT data
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NO_MEM memory error
* - ESP_FAIL failed to add service
*/
esp_err_t mdns_service_add_for_host(const char *instance_name, const char *service_type, const char *proto,
const char *hostname, uint16_t port, mdns_txt_item_t txt[], size_t num_items);
/**
* @brief Check whether a service has been added.
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, checks for the local hostname.
*
* @return
* - true Correspondding service has been added.
* - false Service not found.
*/
bool mdns_service_exists(const char *service_type, const char *proto, const char *hostname);
/**
* @brief Check whether a service has been added.
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, checks for the local hostname.
*
* @return
* - true Correspondding service has been added.
* - false Service not found.
*/
bool mdns_service_exists_with_instance(const char *instance, const char *service_type, const char *proto,
const char *hostname);
/**
* @brief Remove service from mDNS server
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_remove(const char *service_type, const char *proto);
/**
* @brief Remove service from mDNS server with hostname
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_remove_for_host(const char *instance, const char *service_type, const char *proto, const char *hostname);
/**
* @brief Set instance name for service
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param instance_name instance name to set
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_instance_name_set(const char *service_type, const char *proto, const char *instance_name);
/**
* @brief Set instance name for service with hostname
*
* @param instance_old original instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param instance_name instance name to set
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_instance_name_set_for_host(const char *instance_old, const char *service_type, const char *proto, const char *hostname,
const char *instance_name);
/**
* @brief Set service port
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param port service port
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_port_set(const char *service_type, const char *proto, uint16_t port);
/**
* @brief Set service port with hostname
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param port service port
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_port_set_for_host(const char *instance, const char *service_type, const char *proto, const char *hostname,
uint16_t port);
/**
* @brief Replace all TXT items for service
*
* @note The value length of txt items will be automatically decided by strlen
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param txt array of TXT data (eg. {{"var","val"},{"other","2"}})
* @param num_items number of items in TXT data
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_set(const char *service_type, const char *proto, mdns_txt_item_t txt[], uint8_t num_items);
/**
* @brief Replace all TXT items for service with hostname
*
* @note The value length of txt items will be automatically decided by strlen
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param txt array of TXT data (eg. {{"var","val"},{"other","2"}})
* @param num_items number of items in TXT data
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_set_for_host(const char *instance, const char *service_type, const char *proto, const char *hostname,
mdns_txt_item_t txt[], uint8_t num_items);
/**
* @brief Set/Add TXT item for service TXT record
*
* @note The value length will be automatically decided by strlen
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param key the key that you want to add/update
* @param value the new value of the key
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_set(const char *service_type, const char *proto, const char *key, const char *value);
/**
* @brief Set/Add TXT item for service TXT record
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param key the key that you want to add/update
* @param value the new value of the key
* @param value_len the length of the value
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_set_with_explicit_value_len(const char *service_type, const char *proto,
const char *key, const char *value, uint8_t value_len);
/**
* @brief Set/Add TXT item for service TXT record with hostname
*
* @note The value length will be automatically decided by strlen
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param key the key that you want to add/update
* @param value the new value of the key
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_set_for_host(const char *instance, const char *service_type, const char *proto, const char *hostname,
const char *key, const char *value);
/**
* @brief Set/Add TXT item for service TXT record with hostname and txt value length
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param key the key that you want to add/update
* @param value the new value of the key
* @param value_len the length of the value
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_set_for_host_with_explicit_value_len(const char *instance, const char *service_type, const char *proto,
const char *hostname, const char *key,
const char *value, uint8_t value_len);
/**
* @brief Remove TXT item for service TXT record
*
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param key the key that you want to remove
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_remove(const char *service_type, const char *proto, const char *key);
/**
* @brief Remove TXT item for service TXT record with hostname
*
* @param instance instance name
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param key the key that you want to remove
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_txt_item_remove_for_host(const char *instance, const char *service_type, const char *proto, const char *hostname,
const char *key);
/**
* @brief Add a subtype for service.
*
* @param instance_name instance name. If NULL, will find the first service with the same service type and protocol.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param subtype The subtype to add.
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_subtype_add_for_host(const char *instance_name, const char *service_type, const char *proto,
const char *hostname, const char *subtype);
/**
* @brief Remove a subtype for service.
*
* @param instance_name instance name. If NULL, will find the first service with the same service type and protocol.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param subtype The subtype to remove.
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
*/
esp_err_t mdns_service_subtype_remove_for_host(const char *instance_name, const char *service_type, const char *proto,
const char *hostname, const char *subtype);
/**
* @brief Add multiple subtypes for service at once.
*
* @param instance_name instance name. If NULL, will find the first service with the same service type and protocol.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param subtype the pointer of subtype array to add.
* @param num_items number of items in subtype array
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_subtype_add_multiple_items_for_host(const char *instance_name, const char *service_type, const char *proto,
const char *hostname, mdns_subtype_item_t subtype[], uint8_t num_items);
/**
* @brief Update subtype for service.
*
* @param instance_name instance name. If NULL, will find the first service with the same service type and protocol.
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param hostname service hostname. If NULL, local hostname will be used.
* @param subtype the pointer of subtype array to add.
* @param num_items number of items in subtype array
*
* @note If `num_items` is 0, then remove all subtypes.
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_NOT_FOUND Service not found
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_service_subtype_update_multiple_items_for_host(const char *instance_name, const char *service_type, const char *proto,
const char *hostname, mdns_subtype_item_t subtype[], uint8_t num_items);
/**
* @brief Remove and free all services from mDNS server
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t mdns_service_remove_all(void);
/**
* @brief Deletes the finished query. Call this only after the search has ended!
*
* @param search pointer to search object
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE search has not finished
* - ESP_ERR_INVALID_ARG pointer to search object is NULL
*/
esp_err_t mdns_query_async_delete(mdns_search_once_t *search);
/**
* @brief Get results from search pointer. Results available as a pointer to the output parameter.
* Pointer to search object has to be deleted via `mdns_query_async_delete` once the query has finished.
* The results although have to be freed manually.
*
* @param search pointer to search object
* @param timeout time in milliseconds to wait for answers
* @param results pointer to the results of the query
* @param num_results pointer to the number of the actual result items (set to NULL to ignore this return value)
*
* @return
* True if search has finished before or at timeout
* False if search timeout is over
*/
bool mdns_query_async_get_results(mdns_search_once_t *search, uint32_t timeout, mdns_result_t **results, uint8_t *num_results);
/**
* @brief Query mDNS for host or service asynchronousely.
* Search has to be tested for progress and deleted manually!
*
* @param name service instance or host name (NULL for PTR queries)
* @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries)
* @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries)
* @param type type of query (MDNS_TYPE_*)
* @param timeout time in milliseconds during which mDNS query is active
* @param max_results maximum results to be collected
* @param notifier Notification function to be called when the result is ready, can be NULL
*
* @return mdns_search_once_s pointer to new search object if query initiated successfully.
* NULL otherwise.
*/
mdns_search_once_t *mdns_query_async_new(const char *name, const char *service_type, const char *proto, uint16_t type,
uint32_t timeout, size_t max_results, mdns_query_notify_t notifier);
/**
* @brief Generic mDNS query
* All following query methods are derived from this one
*
* @param name service instance or host name (NULL for PTR queries)
* @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries)
* @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries)
* @param type type of query (MDNS_TYPE_*)
* @param transmission_type either Unicast query, or Multicast query
* @param timeout time in milliseconds to wait for answers.
* @param max_results maximum results to be collected
* @param results pointer to the results of the query
* results must be freed using mdns_query_results_free below
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG timeout was not given
*/
esp_err_t mdns_query_generic(const char *name, const char *service_type, const char *proto, uint16_t type,
mdns_query_transmission_type_t transmission_type, uint32_t timeout, size_t max_results, mdns_result_t **results);
/**
* @brief Query mDNS for host or service
*
* Note that querying PTR types sends Multicast query, all other types send Unicast queries
*
* @param name service instance or host name (NULL for PTR queries)
* @param service_type service type (_http, _arduino, _ftp etc.) (NULL for host queries)
* @param proto service protocol (_tcp, _udp, etc.) (NULL for host queries)
* @param type type of query (MDNS_TYPE_*)
* @param timeout time in milliseconds to wait for answers.
* @param max_results maximum results to be collected
* @param results pointer to the results of the query
* results must be freed using mdns_query_results_free below
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG timeout was not given
*/
esp_err_t mdns_query(const char *name, const char *service_type, const char *proto, uint16_t type, uint32_t timeout, size_t max_results, mdns_result_t **results);
/**
* @brief Free query results
*
* @param results linked list of results to be freed
*/
void mdns_query_results_free(mdns_result_t *results);
/**
* @brief Query mDNS for service
*
* @param service_type service type (_http, _arduino, _ftp etc.)
* @param proto service protocol (_tcp, _udp, etc.)
* @param timeout time in milliseconds to wait for answer.
* @param max_results maximum results to be collected
* @param results pointer to the results of the query
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_query_ptr(const char *service_type, const char *proto, uint32_t timeout, size_t max_results, mdns_result_t **results);
/**
* @brief Query mDNS for SRV record
*
* @param instance_name service instance name
* @param service_type service type (_http, _arduino, _ftp etc.)
* @param proto service protocol (_tcp, _udp, etc.)
* @param timeout time in milliseconds to wait for answer.
* @param result pointer to the result of the query
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_query_srv(const char *instance_name, const char *service_type, const char *proto, uint32_t timeout, mdns_result_t **result);
/**
* @brief Query mDNS for TXT record
*
* @param instance_name service instance name
* @param service_type service type (_http, _arduino, _ftp etc.)
* @param proto service protocol (_tcp, _udp, etc.)
* @param timeout time in milliseconds to wait for answer.
* @param result pointer to the result of the query
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_query_txt(const char *instance_name, const char *service_type, const char *proto, uint32_t timeout, mdns_result_t **result);
/**
* @brief Look up delegated services.
*
* @param instance instance name (NULL for uncertain instance)
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param max_results maximum results to be collected
* @param result pointer to the result of the search
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_lookup_delegated_service(const char *instance, const char *service_type, const char *proto, size_t max_results,
mdns_result_t **result);
/**
* @brief Look up self hosted services.
*
* @param instance instance name (NULL for uncertain instance)
* @param service_type service type (_http, _ftp, etc)
* @param proto service protocol (_tcp, _udp)
* @param max_results maximum results to be collected
* @param result pointer to the result of the search
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_lookup_selfhosted_service(const char *instance, const char *service_type, const char *proto, size_t max_results,
mdns_result_t **result);
/**
* @brief Query mDNS for A record
*
* @param host_name host name to look for
* @param timeout time in milliseconds to wait for answer.
* @param addr pointer to the resulting IP4 address
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_query_a(const char *host_name, uint32_t timeout, esp_ip4_addr_t *addr);
#if CONFIG_LWIP_IPV6
/**
* @brief Query mDNS for A record
*
* Please note that hostname must not contain domain name, as mDNS uses '.local' domain.
*
* @param host_name host name to look for
* @param timeout time in milliseconds to wait for answer. If 0, max_results needs to be defined
* @param addr pointer to the resulting IP6 address
*
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NO_MEM memory error
* - ESP_ERR_INVALID_ARG parameter error
*/
esp_err_t mdns_query_aaaa(const char *host_name, uint32_t timeout, esp_ip6_addr_t *addr);
#endif
/**
* @brief Register custom esp_netif with mDNS functionality
* mDNS service runs by default on preconfigured interfaces (STA, AP, ETH).
* This API enables running the service on any customized interface,
* either using standard WiFi or Ethernet driver or any kind of user defined driver.
*
* @param esp_netif Pointer to esp-netif interface
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running or this netif is already registered
* - ESP_ERR_NO_MEM not enough memory for this in interface in the netif list (see CONFIG_MDNS_MAX_INTERFACES)
*/
esp_err_t mdns_register_netif(esp_netif_t *esp_netif);
/**
* @brief Unregister esp-netif already registered in mDNS service
*
* @param esp_netif Pointer to esp-netif interface
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running
* - ESP_ERR_NOT_FOUND this esp-netif was not registered in mDNS service
*/
esp_err_t mdns_unregister_netif(esp_netif_t *esp_netif);
/**
* @brief Set esp_netif to a desired state, or perform a desired action, such as enable/disable this interface
* or send announcement packets to this netif
*
* * This function is used to enable (probe, resolve conflicts and announce), announce, or disable (send bye) mDNS
* services on the specified network interface.
* * This function must be called if users registers a specific interface using mdns_register_netif()
* to enable mDNS services on that interface.
* * This function could be used in IP/connection event handlers to automatically enable/announce mDNS services
* when network properties change and/or disable them on disconnection.
*
* @param esp_netif Pointer to esp-netif interface
* @param event_action Disable/Enable/Announce on this interface over IPv4/IPv6 protocol.
* Actions enumerated in mdns_event_actions_t type.
* @return
* - ESP_OK success
* - ESP_ERR_INVALID_STATE mDNS is not running or this netif is not registered
* - ESP_ERR_NO_MEM memory error
*/
esp_err_t mdns_netif_action(esp_netif_t *esp_netif, mdns_event_actions_t event_action);
/**
* @brief Browse mDNS for a service `_service._proto`.
*
* @param service Pointer to the `_service` which will be browsed.
* @param proto Pointer to the `_proto` which will be browsed.
* @param notifier The callback which will be called when the browsing service changed.
* @return mdns_browse_t pointer to new browse object if initiated successfully.
* NULL otherwise.
*/
mdns_browse_t *mdns_browse_new(const char *service, const char *proto, mdns_browse_notify_t notifier);
/**
* @brief Stop the `_service._proto` browse.
* @param service Pointer to the `_service` which will be browsed.
* @param proto Pointer to the `_proto` which will be browsed.
* @return
* - ESP_OK success.
* - ESP_ERR_FAIL mDNS is not running or the browsing of `_service._proto` is never started.
* - ESP_ERR_NO_MEM memory error.
*/
esp_err_t mdns_browse_delete(const char *service, const char *proto);
#ifdef __cplusplus
}
#endif
#endif /* ESP_MDNS_H_ */
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