Diff: ble/DiscoveredCharacteristic.h

Revision:

716:11b41f651697

Child:

720:ce8a760a4504

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ble/DiscoveredCharacteristic.h	Thu Jul 02 09:06:11 2015 +0100
@@ -0,0 +1,191 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 __DISCOVERED_CHARACTERISTIC_H__
+#define __DISCOVERED_CHARACTERISTIC_H__
+
+#include "UUID.h"
+#include "Gap.h"
+#include "GattAttribute.h"
+#include "GattClient.h"
+
+/**
+ * Structure for holding information about the service and the characteristics
+ * found during the discovery process.
+ */
+class DiscoveredCharacteristic {
+public:
+    struct Properties_t {
+        uint8_t _broadcast       :1; /**< Broadcasting of the value permitted. */
+        uint8_t _read            :1; /**< Reading the value permitted. */
+        uint8_t _writeWoResp     :1; /**< Writing the value with Write Command permitted. */
+        uint8_t _write           :1; /**< Writing the value with Write Request permitted. */
+        uint8_t _notify          :1; /**< Notications of the value permitted. */
+        uint8_t _indicate        :1; /**< Indications of the value permitted. */
+        uint8_t _authSignedWrite :1; /**< Writing the value with Signed Write Command permitted. */
+
+    public:
+        bool broadcast(void)       const {return _broadcast;      }
+        bool read(void)            const {return _read;           }
+        bool writeWoResp(void)     const {return _writeWoResp;    }
+        bool write(void)           const {return _write;          }
+        bool notify(void)          const {return _notify;         }
+        bool indicate(void)        const {return _indicate;       }
+        bool authSignedWrite(void) const {return _authSignedWrite;}
+
+    private:
+        operator uint8_t()  const; /* disallow implicit conversion into an integer */
+        operator unsigned() const; /* disallow implicit conversion into an integer */
+    };
+
+    /**
+     * Structure for holding information about the service and the characteristics
+     * found during the discovery process.
+     */
+    struct DiscoveredDescriptor {
+        GattAttribute::Handle_t handle; /**< Descriptor Handle. */
+        UUID                    uuid;   /**< Descriptor UUID. */
+    };
+
+    /**
+     * Callback type for when a characteristic descriptor is found during descriptor-
+     * discovery. The receiving function is passed in a pointer to a
+     * DiscoveredDescriptor object which will remain valid for the lifetime
+     * of the callback. Memory for this object is owned by the BLE_API eventing
+     * framework. The application can safely make a persistent shallow-copy of
+     * this object in order to work with the characteristic beyond the callback.
+     */
+    typedef void (*DescriptorCallback_t)(const DiscoveredDescriptor *);
+
+    /**
+     * Initiate (or continue) a read for the value attribute, optionally at a
+     * given offset. If the Characteristic or Descriptor to be read is longer
+     * than ATT_MTU - 1, this function must be called multiple times with
+     * appropriate offset to read the complete value.
+     *
+     * @return BLE_ERROR_NONE if a read has been initiated, else
+     *         BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+     *         BLE_STACK_BUSY if some client procedure already in progress, or
+     *         BLE_ERROR_OPERATION_NOT_PERMITTED due to the characteristic's properties.
+     */
+    ble_error_t read(uint16_t offset = 0) const;
+
+    /**
+     * Perform a write without response procedure.
+     *
+     * @param  length
+     *           The amount of data being written.
+     * @param  value
+     *           The bytes being written.
+     *
+     * @note   It is important to note that a write without response will generate
+     *         an onDataSent() callback when the packet has been transmitted. There
+     *         will be a BLE-stack specific limit to the number of pending
+     *         writeWoResponse operations; the user may want to use the onDataSent()
+     *         callback for flow-control.
+     *
+     * @retval BLE_ERROR_NONE Successfully started the Write procedure, else
+     *         BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+     *         BLE_STACK_BUSY if some client procedure already in progress, or
+     *         BLE_ERROR_NO_MEM if there are no available buffers left to process the request, or
+     *         BLE_ERROR_OPERATION_NOT_PERMITTED due to the characteristic's properties.
+     */
+    ble_error_t writeWoResponse(uint16_t length, const uint8_t *value) const;
+
+    /**
+     * Initiate a GATT Characteristic Descriptor Discovery procedure for descriptors within this characteristic.
+     *
+     * @param  callback
+     * @param  matchingUUID
+     *           filter for descriptors. Defaults to wildcard which will discover all descriptors.
+     *
+     * @return  BLE_ERROR_NONE if descriptor discovery is launched successfully; else an appropriate error.
+     */
+    ble_error_t discoverDescriptors(DescriptorCallback_t callback, const UUID &matchingUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) const;
+
+    /**
+     * Perform a write procedure.
+     *
+     * @param  length
+     *           The amount of data being written.
+     * @param  value
+     *           The bytes being written.
+     *
+     * @note   It is important to note that a write will generate
+     *         an onDataWritten() callback when the peer acknowledges the request.
+     *
+     * @retval BLE_ERROR_NONE Successfully started the Write procedure, else
+     *         BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+     *         BLE_STACK_BUSY if some client procedure already in progress, or
+     *         BLE_ERROR_NO_MEM if there are no available buffers left to process the request, or
+     *         BLE_ERROR_OPERATION_NOT_PERMITTED due to the characteristic's properties.
+     */
+    ble_error_t write(uint16_t length, const uint8_t *value) const;
+
+    static void setupOnDataRead(GattClient::ReadCallback_t callback) {
+        onDataReadCallback = callback;
+    }
+
+    static void setupOnDataWrite(GattClient::WriteCallback_t callback) {
+        onDataWriteCallback = callback;
+    }
+
+    void setupLongUUID(UUID::LongUUIDBytes_t longUUID) {
+        uuid.setupLong(longUUID);
+    }
+
+public:
+    UUID::ShortUUIDBytes_t getShortUUID(void) const {
+        return uuid.getShortUUID();
+    }
+
+    const Properties_t& getProperties(void) const {
+        return props;
+    }
+
+    const GattAttribute::Handle_t& getDeclHandle(void) const {
+        return declHandle;
+    }
+    const GattAttribute::Handle_t& getValueHandle(void) const {
+        return valueHandle;
+    }
+
+public:
+    DiscoveredCharacteristic() : gattc(NULL),
+                                 uuid(UUID::ShortUUIDBytes_t(0)),
+                                 props(),
+                                 declHandle(GattAttribute::INVALID_HANDLE),
+                                 valueHandle(GattAttribute::INVALID_HANDLE) {
+        /* empty */
+    }
+
+protected:
+    GattClient              *gattc;
+
+protected:
+    UUID                     uuid;
+    Properties_t             props;
+    GattAttribute::Handle_t  declHandle;
+    GattAttribute::Handle_t  valueHandle;
+
+    Gap::Handle_t            connHandle;
+
+public:
+    static GattClient::ReadCallback_t  onDataReadCallback;
+    static GattClient::WriteCallback_t onDataWriteCallback;
+};
+
+#endif /*__DISCOVERED_CHARACTERISTIC_H__*/
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