Simon Cooksey
Pinned to some recent date
Diff: features/FEATURE_BLE/ble/DiscoveredCharacteristic.h
- Revision:
- 0:fb7af294d5d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/FEATURE_BLE/ble/DiscoveredCharacteristic.h Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,433 @@
+/* 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"
+#include "CharacteristicDescriptorDiscovery.h"
+#include "ble/DiscoveredCharacteristicDescriptor.h"
+
+/**
+ * @brief Representation of a characteristic discovered during a GattClient
+ * discovery procedure (see GattClient::launchServiceDiscovery ).
+ *
+ * @details Provide detailed informations about a discovered characteristic like:
+ * - Its UUID (see getUUID()).
+ * - The most important handles of the characteristic definition
+ * (see getDeclHandle(), getValueHandle(), getLastHandle())
+ * - Its properties (see getProperties()).
+ * This class also provide functions to operate on the characteristic:
+ * - Read the characteristic value (see read())
+ * - Writing a characteristic value (see write() or writeWoResponse())
+ * - Discover descriptors inside the characteristic definition. These descriptors
+ * extends the characteristic. More information about descriptor usage is
+ * available in DiscoveredCharacteristicDescriptor class.
+ */
+class DiscoveredCharacteristic {
+public:
+ /**
+ * Structure that encapsulates the properties of a discovered
+ * characteristic.
+ */
+ struct Properties_t {
+ uint8_t _broadcast :1; /**< Broadcasting 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; /**< Notifications 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:
+ /**
+ * @brief Check if broadcasting is permitted.
+ *
+ * @return true if broadcasting the value is permitted, and false
+ * otherwise.
+ */
+ bool broadcast(void) const {
+ return _broadcast;
+ }
+
+ /**
+ * @brief Check reading is permitted.
+ *
+ * @return true if reading the value is permitted, and false
+ * otherwise.
+ */
+ bool read(void) const {
+ return _read;
+ }
+
+ /**
+ * @brief Check if writing with Write Command is permitted.
+ *
+ * @return true if writing the value with Write Command is permitted,
+ * false otherwise.
+ */
+ bool writeWoResp(void) const {
+ return _writeWoResp;
+ }
+
+ /**
+ * @brief Check if writing with Write Request is permitted.
+ *
+ * @return true if writing the value with Write Request is permitted,
+ * false otherwise.
+ */
+ bool write(void) const {
+ return _write;
+ }
+
+ /**
+ * @brief Check notifications are permitted.
+ *
+ * @return true if notifications of the value are permitted, false
+ * otherwise.
+ */
+ bool notify(void) const {
+ return _notify;
+ }
+
+ /**
+ * @brief Check if indications are permitted.
+ *
+ * @return true if indications of the value are permitted, false
+ * otherwise.
+ */
+ bool indicate(void) const {
+ return _indicate;
+ }
+
+ /**
+ * @brief Check if writing with Signed Write Command is permitted.
+ *
+ * @return true if writing the value with Signed Write Command is
+ * permitted, false otherwise.
+ */
+ bool authSignedWrite(void) const {
+ return _authSignedWrite;
+ }
+
+ /**
+ * @brief "Equal to" operator for DiscoveredCharacteristic::Properties_t
+ *
+ * @param[in] lhs The left hand side of the equality expression
+ * @param[in] rhs The right hand side of the equality expression
+ *
+ * @return true if operands are equals, false otherwise.
+ */
+ friend bool operator==(Properties_t lhs, Properties_t rhs) {
+ return lhs._broadcast == rhs._broadcast &&
+ lhs._read == rhs._read &&
+ lhs._writeWoResp == rhs._writeWoResp &&
+ lhs._write == rhs._write &&
+ lhs._notify == rhs._notify &&
+ lhs._indicate == rhs._indicate &&
+ lhs._authSignedWrite == rhs._authSignedWrite;
+ }
+
+ /**
+ * @brief "Not equal to" operator for DiscoveredCharacteristic::Properties_t
+ *
+ * @param lhs The right hand side of the expression
+ * @param rhs The left hand side of the expression
+ *
+ * @return true if operands are not equals, false otherwise.
+ */
+ friend bool operator!=(Properties_t lhs, Properties_t rhs) {
+ return !(lhs == rhs);
+ }
+
+ private:
+ operator uint8_t() const; /* Disallow implicit conversion into an integer. */
+ operator unsigned() const; /* Disallow implicit conversion into an integer. */
+ };
+
+ /**
+ * 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.
+ *
+ * @param[in] offset
+ * The position - in the characteristic value bytes stream - where
+ * the read operation begin.
+ *
+ * @return BLE_ERROR_NONE if a read has been initiated, or
+ * BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+ * BLE_STACK_BUSY if some client procedure is already in progress, or
+ * BLE_ERROR_OPERATION_NOT_PERMITTED due to the characteristic's properties.
+ */
+ ble_error_t read(uint16_t offset = 0) const;
+
+ /**
+ * @brief Same as #read(uint16_t) const but allow the user to register a callback
+ * which will be fired once the read is done.
+ *
+ * @param[in] offset
+ * The position - in the characteristic value bytes stream - where
+ * the read operation begin.
+ * @param[in] onRead
+ * Continuation of the read operation
+ */
+ ble_error_t read(uint16_t offset, const GattClient::ReadCallback_t& onRead) const;
+
+ /**
+ * Perform a write without response procedure.
+ *
+ * @param[in] length
+ * The amount of data being written.
+ * @param[in] 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, or
+ * BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+ * BLE_STACK_BUSY if some client procedure is 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[in] onDescriptorDiscovered This callback will be called every time a descriptor is discovered
+ * @param[in] onTermination This callback will be called when the discovery process is over.
+ *
+ * @return BLE_ERROR_NONE if descriptor discovery is launched successfully; else an appropriate error.
+ */
+ ble_error_t discoverDescriptors(const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& onDescriptorDiscovered,
+ const CharacteristicDescriptorDiscovery::TerminationCallback_t& onTermination) const;
+
+ /**
+ * Perform a write procedure.
+ *
+ * @param[in] length
+ * The amount of data being written.
+ * @param[in] 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, or
+ * BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+ * BLE_STACK_BUSY if some client procedure is 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;
+
+ /**
+ * Same as write(uint16_t, const uint8_t *) const but register a callback
+ * which will be called once the data has been written.
+ *
+ * @param[in] length
+ * The amount of bytes to write.
+ * @param[in] value
+ * The bytes to write.
+ * @param[in] onWrite
+ * Continuation callback for the write operation
+ *
+ * @retval BLE_ERROR_NONE Successfully started the Write procedure, or
+ * BLE_ERROR_INVALID_STATE if some internal state about the connection is invalid, or
+ * BLE_STACK_BUSY if some client procedure is 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 GattClient::WriteCallback_t& onWrite) const;
+
+ void setupLongUUID(UUID::LongUUIDBytes_t longUUID, UUID::ByteOrder_t order = UUID::MSB) {
+ uuid.setupLong(longUUID, order);
+ }
+
+public:
+ /**
+ * @brief Get the UUID of the discovered characteristic
+ * @return the UUID of this characteristic
+ */
+ const UUID& getUUID(void) const {
+ return uuid;
+ }
+
+ /**
+ * @brief Get the properties of this characteristic
+ * @return the set of properties of this characteristic
+ */
+ const Properties_t& getProperties(void) const {
+ return props;
+ }
+
+ /**
+ * @brief Get the declaration handle of this characteristic.
+ * @details The declaration handle is the first handle of a characteristic
+ * definition. The value accessible at this handle contains the following
+ * informations:
+ * - The characteristics properties (see Properties_t). This value can
+ * be accessed by using #getProperties .
+ * - The characteristic value attribute handle. This field can be accessed
+ * by using #getValueHandle .
+ * - The characteristic UUID, this value can be accessed by using the
+ * function #getUUID .
+ * @return the declaration handle of this characteristic.
+ */
+ GattAttribute::Handle_t getDeclHandle(void) const {
+ return declHandle;
+ }
+
+ /**
+ * @brief Return the handle used to access the value of this characteristic.
+ * @details This handle is the one provided in the characteristic declaration
+ * value. Usually, it is equal to #getDeclHandle() + 1. But it is not always
+ * the case. Anyway, users are allowed to use #getDeclHandle() + 1 to access
+ * the value of a characteristic.
+ * @return The handle to access the value of this characteristic.
+ */
+ GattAttribute::Handle_t getValueHandle(void) const {
+ return valueHandle;
+ }
+
+ /**
+ * @brief Return the last handle of the characteristic definition.
+ * @details A Characteristic definition can contain a lot of handles:
+ * - one for the declaration (see #getDeclHandle)
+ * - one for the value (see #getValueHandle)
+ * - zero of more for the characteristic descriptors.
+ * This handle is the last handle of the characteristic definition.
+ * @return The last handle of this characteristic definition.
+ */
+ GattAttribute::Handle_t getLastHandle(void) const {
+ return lastHandle;
+ }
+
+ /**
+ * @brief Return the GattClient which can operate on this characteristic.
+ * @return The GattClient which can operate on this characteristic.
+ */
+ GattClient* getGattClient() {
+ return gattc;
+ }
+
+ /**
+ * @brief Return the GattClient which can operate on this characteristic.
+ * @return The GattClient which can operate on this characteristic.
+ */
+ const GattClient* getGattClient() const {
+ return gattc;
+ }
+
+ /**
+ * @brief Return the connection handle to the GattServer which contain
+ * this characteristic.
+ * @return the connection handle to the GattServer which contain
+ * this characteristic.
+ */
+ Gap::Handle_t getConnectionHandle() const {
+ return connHandle;
+ }
+
+ /**
+ * @brief "Equal to" operator for DiscoveredCharacteristic
+ *
+ * @param[in] lhs
+ * The left hand side of the equality expression
+ * @param[in] rhs
+ * The right hand side of the equality expression
+ *
+ * @return true if operands are equals, false otherwise.
+ */
+ friend bool operator==(const DiscoveredCharacteristic& lhs, const DiscoveredCharacteristic& rhs) {
+ return lhs.gattc == rhs.gattc &&
+ lhs.uuid == rhs.uuid &&
+ lhs.props == rhs.props &&
+ lhs.declHandle == rhs.declHandle &&
+ lhs.valueHandle == rhs.valueHandle &&
+ lhs.lastHandle == rhs.lastHandle &&
+ lhs.connHandle == rhs.connHandle;
+ }
+
+ /**
+ * @brief "Not equal to" operator for DiscoveredCharacteristic
+ *
+ * @param[in] lhs
+ * The right hand side of the expression
+ * @param[in] rhs
+ * The left hand side of the expression
+ *
+ * @return true if operands are not equal, false otherwise.
+ */
+ friend bool operator !=(const DiscoveredCharacteristic& lhs, const DiscoveredCharacteristic& rhs) {
+ return !(lhs == rhs);
+ }
+
+public:
+ DiscoveredCharacteristic() : gattc(NULL),
+ uuid(UUID::ShortUUIDBytes_t(0)),
+ props(),
+ declHandle(GattAttribute::INVALID_HANDLE),
+ valueHandle(GattAttribute::INVALID_HANDLE),
+ lastHandle(GattAttribute::INVALID_HANDLE),
+ connHandle() {
+ /* empty */
+ }
+
+protected:
+ /**
+ * Pointer to the underlying GattClient for this DiscoveredCharacteristic object.
+ */
+ GattClient *gattc;
+
+protected:
+ /**
+ * Discovered characteristic's UUID.
+ */
+ UUID uuid;
+ /**
+ * Hold the configured properties of the discovered characteristic.
+ * For more information refer to Properties_t.
+ */
+ Properties_t props;
+ /**
+ * Value handle of the discovered characteristic's declaration attribute.
+ */
+ GattAttribute::Handle_t declHandle;
+ /**
+ * Value handle of the discovered characteristic's value attribute.
+ */
+ GattAttribute::Handle_t valueHandle;
+ /**
+ * Value handle of the discovered characteristic's last attribute.
+ */
+ GattAttribute::Handle_t lastHandle;
+
+ /**
+ * Handle for the connection where the characteristic was discovered.
+ */
+ Gap::Handle_t connHandle;
+};
+
+#endif /*__DISCOVERED_CHARACTERISTIC_H__*/