[WIP] DFUService Implementation

descriptors/CharacteristicUserDescriptionDescriptor.h

@@ -0,0 +1,59 @@
+/*
+ * Mbed-OS Microcontroller Library
+ * Copyright (c) 2020 Embedded Planet
+ * Copyright (c) 2020 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+#ifndef MBED_OS_EXPERIMENTAL_BLE_SERVICES_DESCRIPTORS_CHARACTERISTICUSERDESCRIPTIONDESCRIPTOR_H_
+#define MBED_OS_EXPERIMENTAL_BLE_SERVICES_DESCRIPTORS_CHARACTERISTICUSERDESCRIPTIONDESCRIPTOR_H_
+
+#include "ble/gatt/GattCharacteristic.h"
+#include "ble/gatt/GattAttribute.h"
+
+/**
+ * Class encapsulating a Characteristic User Description Descriptor (CUDD)
+ *
+ * See Bluetooth Core Specification 5.2, Volume 3, Part G, Section 3.3.3.2
+ *
+ * TODO extend this in the future to support client-writable CUDD (set Writable Auxiliary bit)
+ */
+class CharacteristicUserDescriptionDescriptor : public GattAttribute
+{
+public:
+
+    CharacteristicUserDescriptionDescriptor(const char* user_description) :
+        GattAttribute((const UUID&) UUID(BLE_UUID_DESCRIPTOR_CHAR_USER_DESC),
+        (uint8_t*) user_description,
+        (user_description != nullptr) ? strlen(user_description) : 0,
+        (user_description != nullptr) ? strlen(user_description) : 0,
+        false),
+        _user_description(user_description)
+    {
+        this->allowWrite(false);
+    }
+
+    const char* get_user_description() const {
+        return _user_description;
+    }
+
+private:
+
+    const char* _user_description;
+
+
+};
+
+#endif /* MBED_OS_EXPERIMENTAL_BLE_SERVICES_DESCRIPTORS_CHARACTERISTICUSERDESCRIPTIONDESCRIPTOR_H_ */