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diff --git a/shared-bindings/_bleio/Attribute.c b/shared-bindings/_bleio/Attribute.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Dan Halbert for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/_bleio/Characteristic.h"
+#include "shared-bindings/_bleio/UUID.h"
+
+//
+
+//| .. currentmodule:: _bleio
+//|
+//| :class:`Attribute` -- BLE Attribute
+//| =========================================================
+//|
+//| Definitions associated with all BLE attributes: characteristics, descriptors, etc.
+//| :py:class:`~_bleio.Attribute` is, notionally, a superclass of
+//| :py:class:`~Characteristic` and :py:class:`~Descriptor`,
+//| but is not defined as a Python superclass of those classes.
+//|
+//| .. class:: Attribute()
+//|
+//|   You cannot create an instance of :py:class:`~_bleio.Attribute`.
+//|
+
+STATIC const mp_rom_map_elem_t bleio_attribute_locals_dict_table[] = {
+
+//|   .. data:: NO_ACCESS
+//|
+//|      security mode: access not allowed
+//|
+//|   .. data:: OPEN
+//|
+//|      security_mode: no security (link is not encrypted)
+//|
+//|   .. data:: ENCRYPT_NO_MITM
+//|
+//|      security_mode: unauthenticated encryption, without man-in-the-middle protection
+//|
+//|   .. data:: ENCRYPT_WITH_MITM
+//|
+//|      security_mode: authenticated encryption, with man-in-the-middle protection
+//|
+//|   .. data:: LESC_ENCRYPT_WITH_MITM
+//|
+//|      security_mode: LESC encryption, with man-in-the-middle protection
+//|
+//|   .. data:: SIGNED_NO_MITM
+//|
+//|      security_mode: unauthenticated data signing, without man-in-the-middle protection
+//|
+//|   .. data:: SIGNED_WITH_MITM
+//|
+//|      security_mode: authenticated data signing, without man-in-the-middle protection
+//|
+    { MP_ROM_QSTR(MP_QSTR_NO_ACCESS),              MP_ROM_INT(SECURITY_MODE_NO_ACCESS) },
+    { MP_ROM_QSTR(MP_QSTR_OPEN),                   MP_ROM_INT(SECURITY_MODE_OPEN) },
+    { MP_ROM_QSTR(MP_QSTR_ENCRYPT_NO_MITM),        MP_ROM_INT(SECURITY_MODE_ENC_NO_MITM) },
+    { MP_ROM_QSTR(MP_QSTR_ENCRYPT_WITH_MITM),      MP_ROM_INT(SECURITY_MODE_ENC_WITH_MITM) },
+    { MP_ROM_QSTR(MP_QSTR_LESC_ENCRYPT_WITH_MITM), MP_ROM_INT(SECURITY_MODE_LESC_ENC_WITH_MITM) },
+    { MP_ROM_QSTR(MP_QSTR_SIGNED_NO_MITM),         MP_ROM_INT(SECURITY_MODE_SIGNED_NO_MITM) },
+    { MP_ROM_QSTR(MP_QSTR_SIGNED_WITH_MITM),       MP_ROM_INT(SECURITY_MODE_SIGNED_WITH_MITM) },
+
+};
+STATIC MP_DEFINE_CONST_DICT(bleio_attribute_locals_dict, bleio_attribute_locals_dict_table);
+
+const mp_obj_type_t bleio_attribute_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Attribute,
+    .locals_dict = (mp_obj_dict_t*)&bleio_attribute_locals_dict,
+};