esp8266: modesp: Add status() function for connection status.

esp8266/modesp.c

@@ -105,12 +105,18 @@ STATIC mp_obj_t esp_disconnect() {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp_disconnect_obj, esp_disconnect);
 
+STATIC mp_obj_t esp_status() {
+    return MP_OBJ_NEW_SMALL_INT(wifi_station_get_connect_status());
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp_status_obj, esp_status);
+
 STATIC const mp_map_elem_t esp_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_esp) },
 
     { MP_OBJ_NEW_QSTR(MP_QSTR_connect), (mp_obj_t)&esp_connect_obj },
     { MP_OBJ_NEW_QSTR(MP_QSTR_disconnect), (mp_obj_t)&esp_disconnect_obj },
     { MP_OBJ_NEW_QSTR(MP_QSTR_scan), (mp_obj_t)&esp_scan_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_status), (mp_obj_t)&esp_status_obj },
 };
 
 STATIC MP_DEFINE_CONST_DICT(esp_module_globals, esp_module_globals_table);

esp8266/qstrdefsport.h

@@ -45,3 +45,4 @@ Q(esp)
 Q(connect)
 Q(disconnect)
 Q(scan)
+Q(status)