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diff --git a/circuitpython/devices/ble_hci/common-hal/_bleio/Descriptor.h b/circuitpython/devices/ble_hci/common-hal/_bleio/Descriptor.h
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+++ b/circuitpython/devices/ble_hci/common-hal/_bleio/Descriptor.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Dan Halbert for Adafruit Industries
+ * Copyright (c) 2018 Artur Pacholec
+ * Copyright (c) 2016 Glenn Ruben Bakke
+ *
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_BLE_HCI_COMMON_HAL_DESCRIPTOR_H
+#define MICROPY_INCLUDED_BLE_HCI_COMMON_HAL_DESCRIPTOR_H
+
+#include "py/obj.h"
+
+#include "common-hal/_bleio/UUID.h"
+
+// Forward declare characteristic because it includes a Descriptor.
+struct _bleio_characteristic_obj;
+
+typedef struct _bleio_descriptor_obj {
+    mp_obj_base_t base;
+    // Will be MP_OBJ_NULL before being assigned to a Characteristic.
+    struct _bleio_characteristic_obj *characteristic;
+    bleio_uuid_obj_t *uuid;
+    mp_obj_t value;
+    uint16_t max_length;
+    bool fixed_length;
+    uint16_t handle;
+    bleio_attribute_security_mode_t read_perm;
+    bleio_attribute_security_mode_t write_perm;
+    struct _bleio_descriptor_obj *next;
+} bleio_descriptor_obj_t;
+
+#endif // MICROPY_INCLUDED_BLE_HCI_COMMON_HAL_DESCRIPTOR_H