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SourceVuESP-IDF Framework and Examplesesp_local_ctrl samplemdns_query()

mdns_query() function

Query mDNS for host or service Note that querying PTR types sends Multicast query, all other types send Unicast queries

Syntax

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Summary

Declaration

Definition

from mdns.h:734

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);

Implemented in mdns.c:6877

Arguments

Argument

Description

name

service instance or host name (NULL for PTR queries)

service_type

service type (_http, _arduino, _ftp etc.) (NULL for host queries)

proto

service protocol (_tcp, _udp, etc.) (NULL for host queries)

type

type of query (MDNS_TYPE_*)

timeout

time in milliseconds to wait for answers.

max_results

maximum results to be collected

results

pointer to the results of the query results must be freed using mdns_query_results_free below

Return value

- 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

References

Code

Location

Referrer

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)

mdns.c:6877

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);

mdns.h:734

return mdns_query(NULL, service, proto, MDNS_TYPE_PTR, timeout, max_results, results);

mdns.c:6888

mdns_query_ptr()

return mdns_query(instance, service, proto, MDNS_TYPE_SRV, timeout, 1, result);

mdns.c:6897

mdns_query_srv()

return mdns_query(instance, service, proto, MDNS_TYPE_TXT, timeout, 1, result);

mdns.c:6906

mdns_query_txt()

err = mdns_query(name, NULL, NULL, MDNS_TYPE_A, timeout, 1, &result);

mdns.c:6953

mdns_query_a()

err = mdns_query(name, NULL, NULL, MDNS_TYPE_AAAA, timeout, 1, &result);

mdns.c:6992

mdns_query_aaaa()

esp_err_t err = mdns_query(hostname, NULL, NULL, MDNS_TYPE_ANY, timeout, max_results, &results);

mdns_console.c:401

cmd_mdns_query_ip()

esp_err_t err = mdns_query(instance, service, proto, MDNS_TYPE_ANY, timeout, max_results, &results);

mdns_console.c:468

cmd_mdns_query_svc()

Call Tree

mdns_query() is called by 7 functions and calls 1 function:

mdns_query()

Data Use

mdns_query():

mdns_query()

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