perf: tune BLE scanning performance, switch over to NimBLE

main/CMakeLists.txt

@@ -16,4 +16,5 @@ idf_component_register(
         app_update
         driver
         esp_driver_gpio
+        esp_coex
 )

main/main.c

@@ -5,6 +5,7 @@
 #include "led_indicator.h"
 #include "ota_manager.h"
 #include "esp_ota_ops.h"
+#include "esp_coexist.h"
 
 #include "esp_wifi.h"
 #include "esp_event.h"
@@ -236,6 +237,8 @@ void app_main(void)
         ESP_LOGI(TAG, "OTA rollback cancelled - firmware validated");
     }
 
+    esp_coex_preference_set(ESP_COEX_PREFER_BALANCE);
+
     // init BLE scanner
     ble_scanner_init(on_ble_scan_result);
     ble_scanner_start();