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fix: mdns lookup failing due to early free

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This commit is contained in:
dvdrw
2026-05-13 18:08:36 +02:00
parent 8f1f91997a
commit 5c512f65e9
1 changed files with 26 additions and 28 deletions
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main/main.c
+26 -28
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@@ -8,7 +8,6 @@
#include "esp_event.h"
#include "esp_netif.h"
#include "esp_log.h"
#include "esp_bt.h"
#include "mdns.h"
#include "freertos/FreeRTOS.h"
#include "freertos/event_groups.h"
@@ -48,15 +47,8 @@ static void on_ble_scan_result(const char *tag_id, int8_t rssi)
static void wifi_init_sta(void)
{
esp_netif_create_default_wifi_sta();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, wifi_event_handler, NULL);
esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, wifi_event_handler, NULL);
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_start());
ESP_ERROR_CHECK(esp_wifi_connect());
}
@@ -75,14 +67,24 @@ static bool resolve_mqtt_broker_mdns(char *host_out, size_t host_len, uint16_t *
mdns_result_t *r = results;
while (r) {
if (r->hostname && r->port) {
strncpy(host_out, r->hostname, host_len - 1);
*port_out = r->port;
ESP_LOGI(TAG, "mDNS found broker: %s:%u", host_out, *port_out);
found = true;
goto free_results;
if (r->port) {
if (r->addr) {
snprintf(host_out, host_len, IPSTR, IP2STR(&r->addr->addr.u_addr.ip4));
*port_out = r->port;
ESP_LOGI(TAG, "mDNS found broker: %s:%u", host_out, *port_out);
found = true;
goto free_results;
} else if (r->hostname) {
esp_ip4_addr_t ip4;
if (mdns_query_a(r->hostname, MDNS_QUERY_TIMEOUT_MS, &ip4) == ESP_OK) {
snprintf(host_out, host_len, IPSTR, IP2STR(&ip4));
*port_out = r->port;
ESP_LOGI(TAG, "mDNS found broker: %s:%u", host_out, *port_out);
found = true;
goto free_results;
}
ESP_LOGW(TAG, "mDNS A query for %s failed", r->hostname);
}
}
r = r->next;
}
@@ -106,21 +108,17 @@ void app_main(void)
s_evt = xEventGroupCreate();
// Provisioning
/* WiFi hardware must be up before the provisioning manager runs */
esp_netif_create_default_wifi_sta();
wifi_init_config_t wcfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&wcfg));
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_start());
if (!config_store_is_provisioned()) {
ESP_LOGI(TAG, "Not provisioned - starting BLE provisioning");
/* WiFi must be started (STA mode) before provisioning manager */
esp_netif_create_default_wifi_sta();
wifi_init_config_t wcfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&wcfg));
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_start());
provisioning_run(); /* blocks until complete */
/* Release BT memory now that provisioning used it; we reinit below for scanning */
esp_bt_mem_release(ESP_BT_MODE_BTDM);
/* BT memory released by NETWORK_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BTDM */
}
// connect to wifi