[codex] Fix ESP32 Paxcounter startup with Bluetooth disabled (#10871)

* Fix ESP32 paxcounter startup with Bluetooth disabled

* Address paxcounter startup review feedback

src/modules/esp32/PaxcounterModule.cpp

@@ -6,7 +6,37 @@
 #include "graphics/ScreenFonts.h"
 #include "graphics/SharedUIDisplay.h"
 #include "graphics/images.h"
-#include <assert.h>
+#include <esp_event.h>
+#include <freertos/timers.h>
+
+// Arduino WiFi has a wifiscan.h too, so declare the libpax scanner hooks here.
+void set_wifi_channels(uint16_t channels_map);
+void wifi_sniffer_init(uint16_t wifi_channel_switch_interval);
+void switchWifiChannel(TimerHandle_t xTimer);
+extern TimerHandle_t WifiChanTimer;
+
+static void startWifiChannelTimer(uint16_t wifi_channel_switch_interval)
+{
+    if (wifi_channel_switch_interval == 0) {
+        return;
+    }
+
+    WifiChanTimer =
+        xTimerCreate("WifiChannelTimer", pdMS_TO_TICKS(wifi_channel_switch_interval * 10), pdTRUE, (void *)0, switchWifiChannel);
+    if (!WifiChanTimer) {
+        LOG_WARN("Paxcounter could not create WiFi channel switch timer");
+        return;
+    }
+    xTimerStart(WifiChanTimer, 0);
+}
+
+static void ensureDefaultEventLoop()
+{
+    esp_err_t result = esp_event_loop_create_default();
+    if (result != ESP_OK && result != ESP_ERR_INVALID_STATE) {
+        LOG_WARN("Paxcounter could not create ESP event loop: %d", result);
+    }
+}
 
 PaxcounterModule *paxcounterModule;
 
@@ -90,8 +120,8 @@ int32_t PaxcounterModule::runOnce()
             configuration.blecounter = 1;
             configuration.blescantime = 0; // infinite
             configuration.wificounter = 1;
-            // configuration.wifi_channel_map = WIFI_CHANNEL_ALL;
-            // configuration.wifi_channel_switch_interval = 50;
+            configuration.LIBPAX_WIFI_CHANNEL_map = LIBPAX_WIFI_CHANNEL_ALL;
+            configuration.LIBPAX_WIFI_CHANNEL_switch_interval = 50;
             configuration.wifi_rssi_threshold = Default::getConfiguredOrDefault(moduleConfig.paxcounter.wifi_threshold, -80);
             configuration.ble_rssi_threshold = Default::getConfiguredOrDefault(moduleConfig.paxcounter.ble_threshold, -80);
             libpax_update_config(&configuration);
@@ -101,7 +131,12 @@ int32_t PaxcounterModule::runOnce()
                                 Default::getConfiguredOrDefault(moduleConfig.paxcounter.paxcounter_update_interval,
                                                                 default_telemetry_broadcast_interval_secs),
                                 0);
+            // libpax sets the WiFi country in counter_start(), so start channel rotation after that.
+            ensureDefaultEventLoop();
+            set_wifi_channels(configuration.LIBPAX_WIFI_CHANNEL_map);
+            wifi_sniffer_init(0);
             libpax_counter_start();
+            startWifiChannelTimer(configuration.LIBPAX_WIFI_CHANNEL_switch_interval);
         } else {
             sendInfo(NODENUM_BROADCAST);
         }
@@ -145,4 +180,4 @@ void PaxcounterModule::drawFrame(OLEDDisplay *display, OLEDDisplayUiState *state
 }
 #endif // HAS_SCREEN
 
-#endif
+#endif

src/platform/esp32/main-esp32.cpp

@@ -52,8 +52,25 @@ static bool isNetworkConfiguredToDisableBluetooth()
 #endif
 }
 
+static bool isPaxcounterActiveForBoot()
+{
+#if !MESHTASTIC_EXCLUDE_PAXCOUNTER
+    return moduleConfig.has_paxcounter && moduleConfig.paxcounter.enabled && !config.bluetooth.enabled &&
+           !config.network.wifi_enabled;
+#else
+    return false;
+#endif
+}
+
 static bool shouldReleaseBluetoothMemory()
 {
+    // Paxcounter disables the Meshtastic BLE service, but libpax still needs the
+    // ESP32 BLE controller memory for scanning.
+    if (isPaxcounterActiveForBoot()) {
+        LOG_DEBUG("Skipping Bluetooth memory release because Paxcounter is active");
+        return false;
+    }
+
     // On ESP32 targets WiFi and BLE share radio resources. When WiFi is configured for this boot,
     // BLE will not be started, so its reserved memory can be returned to the heap until reboot.
     if (isNetworkConfiguredToDisableBluetooth()) {