Espressif ESP32-S2 User Manual

Chapter 2. API Reference
• instance_name: service instance name
• service_type: service type (_http, _arduino, _ftp etc.)
• proto: service protocol (_tcp, _udp, etc.)
• timeout: time in milliseconds to wait for answer.
• result: pointer to the result of the query
esp_err_t mdns_query_a(const char *host_name, uint32_t timeout, esp_ip4_addr_t *addr)
Query mDNS for A record.
Return
• ESP_OK success
• ESP_ERR_INVALID_STATE mDNS is not running
• ESP_ERR_NO_MEM memory error
• ESP_ERR_INVALID_ARG parameter error
Parameters
• host_name: host name to look for
• timeout: time in milliseconds to wait for answer.
• addr: pointer to the resulting IP4 address
esp_err_t mdns_query_aaaa(const char *host_name, uint32_t timeout, esp_ip6_addr_t *addr)
Query mDNS for A record.
Please note that hostname must not contain domain name, as mDNS uses ‘.local’domain.
Return
• ESP_OK success
• ESP_ERR_INVALID_STATE mDNS is not running
• ESP_ERR_NO_MEM memory error
• ESP_ERR_INVALID_ARG parameter error
Parameters
• host_name: host name to look for
• timeout: time in milliseconds to wait for answer. If 0, max_results needs to be defined
• addr: pointer to the resulting IP6 address
esp_err_t mdns_handle_system_event(void *ctx, system_event_t *event)
System event handler This method controls the service state on all active interfaces and applications are required
to call it from the system event handler for normal operation of mDNS service.
Please note that hostname must not contain domain name, as mDNS uses ‘.local’domain.
Parameters
• ctx: The system event context
• event: The system event
Structures
struct mdns_txt_item_t
mDNS basic text item structure Used in mdns_service_add()
Public Members
const char *key
item key name
const char *value
item value string
struct mdns_ip_addr_s
mDNS query linked list IP item
Espressif Systems 619
Submit Document Feedback
Release v4.4

Espressif ESP32-S2 Specifications

General

Brand	Espressif
Model	ESP32-S2
Category	Single board computers
Language	English