[wifi] Fix watchdog timeout on P4 WiFi scan (#13520)

esphome/components/esp32_hosted/__init__.py

@@ -12,6 +12,7 @@ from esphome.const import (
     KEY_FRAMEWORK_VERSION,
 )
 from esphome.core import CORE
+from esphome.cpp_generator import add_define
 
 CODEOWNERS = ["@swoboda1337"]
 
@@ -42,6 +43,7 @@ CONFIG_SCHEMA = cv.All(
 
 
 async def to_code(config):
+    add_define("USE_ESP32_HOSTED")
     if config[CONF_ACTIVE_HIGH]:
         esp32.add_idf_sdkconfig_option(
             "CONFIG_ESP_HOSTED_SDIO_RESET_ACTIVE_HIGH",

esphome/components/wifi/wifi_component_esp_idf.cpp

@@ -14,6 +14,7 @@
 
 #include <algorithm>
 #include <cinttypes>
+#include <memory>
 #include <utility>
 #ifdef USE_WIFI_WPA2_EAP
 #if (ESP_IDF_VERSION_MAJOR >= 5) && (ESP_IDF_VERSION_MINOR >= 1)
@@ -828,16 +829,29 @@ void WiFiComponent::wifi_process_event_(IDFWiFiEvent *data) {
 
     uint16_t number = it.number;
     scan_result_.init(number);
-
-    // Process one record at a time to avoid large buffer allocation
-    wifi_ap_record_t record;
+#ifdef USE_ESP32_HOSTED
+    // getting records one at a time fails on P4 with hosted esp32 WiFi coprocessor
+    // Presumably an upstream bug, work-around by getting all records at once
+    auto records = std::make_unique<wifi_ap_record_t[]>(number);
+    err = esp_wifi_scan_get_ap_records(&number, records.get());
+    if (err != ESP_OK) {
+      esp_wifi_clear_ap_list();
+      ESP_LOGW(TAG, "esp_wifi_scan_get_ap_records failed: %s", esp_err_to_name(err));
+      return;
+    }
     for (uint16_t i = 0; i < number; i++) {
+      wifi_ap_record_t &record = records[i];
+#else
+    // Process one record at a time to avoid large buffer allocation
+    for (uint16_t i = 0; i < number; i++) {
+      wifi_ap_record_t record;
       err = esp_wifi_scan_get_ap_record(&record);
       if (err != ESP_OK) {
         ESP_LOGW(TAG, "esp_wifi_scan_get_ap_record failed: %s", esp_err_to_name(err));
         esp_wifi_clear_ap_list();  // Free remaining records not yet retrieved
         break;
       }
+#endif  // USE_ESP32_HOSTED
       bssid_t bssid;
       std::copy(record.bssid, record.bssid + 6, bssid.begin());
       std::string ssid(reinterpret_cast<const char *>(record.ssid));

esphome/core/defines.h

@@ -42,6 +42,7 @@
 #define USE_DEVICES
 #define USE_DISPLAY
 #define USE_ENTITY_ICON
+#define USE_ESP32_HOSTED
 #define USE_ESP32_IMPROV_STATE_CALLBACK
 #define USE_EVENT
 #define USE_FAN