Include wifi.radio singleton in gc

main.c

@@ -95,6 +95,10 @@
 #include "common-hal/canio/CAN.h"
 #endif
 
+#if CIRCUITPY_WIFI
+#include "shared-bindings/wifi/__init__.h"
+#endif
+
 #if MICROPY_ENABLE_PYSTACK
 static size_t PLACE_IN_DTCM_BSS(_pystack[CIRCUITPY_PYSTACK_SIZE / sizeof(size_t)]);
 #endif
@@ -560,6 +564,10 @@ void gc_collect(void) {
     common_hal_bleio_gc_collect();
     #endif
 
+    #if CIRCUITPY_WIFI
+    common_hal_wifi_gc_collect();
+    #endif
+
     // This naively collects all object references from an approximate stack
     // range.
     gc_collect_root((void**)sp, ((uint32_t)port_stack_get_top() - sp) / sizeof(uint32_t));

ports/esp32s2/common-hal/wifi/Radio.c

@@ -31,6 +31,7 @@
 
 #include "common-hal/wifi/__init__.h"
 #include "lib/utils/interrupt_char.h"
+#include "py/gc.h"
 #include "py/runtime.h"
 #include "shared-bindings/ipaddress/IPv4Address.h"
 #include "shared-bindings/wifi/ScannedNetworks.h"
@@ -262,3 +263,8 @@ mp_int_t common_hal_wifi_radio_ping(wifi_radio_obj_t *self, mp_obj_t ip_address,
 
     return elapsed_time;
 }
+
+void common_hal_wifi_radio_gc_collect(wifi_radio_obj_t *self) {
+    // Only bother to scan the actual object references.
+    gc_collect_ptr(self->current_scan);
+}

ports/esp32s2/common-hal/wifi/Radio.h

@@ -59,4 +59,6 @@ typedef struct {
     uint8_t last_disconnect_reason;
 } wifi_radio_obj_t;
 
+extern void common_hal_wifi_radio_gc_collect(wifi_radio_obj_t *self);
+
 #endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_WIFI_RADIO_H

ports/esp32s2/common-hal/wifi/__init__.c

@@ -160,3 +160,7 @@ void ipaddress_ipaddress_to_esp_idf(mp_obj_t ip_address, ip_addr_t* esp_ip_addre
 
     IP_ADDR4(esp_ip_address, bytes[0], bytes[1], bytes[2], bytes[3]);
 }
+
+void common_hal_wifi_gc_collect(void) {
+    common_hal_wifi_radio_gc_collect(&common_hal_wifi_radio_obj);
+}

shared-bindings/wifi/__init__.h

@@ -34,5 +34,6 @@
 extern wifi_radio_obj_t common_hal_wifi_radio_obj;
 
 void common_hal_wifi_init(void);
+void common_hal_wifi_gc_collect(void);
 
 #endif // MICROPY_INCLUDED_SHARED_BINDINGS_WIFI___INIT___H