mirror of https://github.com/ARMmbed/mbed-os.git
627 lines
26 KiB
C++
627 lines
26 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __GATT_CLIENT_H__
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#define __GATT_CLIENT_H__
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#include "Gap.h"
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#include "GattAttribute.h"
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#include "ServiceDiscovery.h"
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#include "CharacteristicDescriptorDiscovery.h"
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#include "GattCallbackParamTypes.h"
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#include "CallChainOfFunctionPointersWithContext.h"
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class GattClient {
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public:
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/**
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* Type for the registered callbacks added to the data read callchain.
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* Refer to GattClient::onDataRead().
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*/
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typedef FunctionPointerWithContext<const GattReadCallbackParams*> ReadCallback_t;
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/**
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* Type for the data read event callchain. Refer to GattClient::onDataRead().
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*/
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typedef CallChainOfFunctionPointersWithContext<const GattReadCallbackParams*> ReadCallbackChain_t;
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/**
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* Enumerator for write operations.
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*/
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enum WriteOp_t {
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GATT_OP_WRITE_REQ = 0x01, /**< Write request. */
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GATT_OP_WRITE_CMD = 0x02, /**< Write command. */
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};
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/**
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* Type for the registered callbacks added to the data write callchain.
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* Refer to GattClient::onDataWrite().
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*/
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typedef FunctionPointerWithContext<const GattWriteCallbackParams*> WriteCallback_t;
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/**
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* Type for the data write event callchain. Refer to GattClient::onDataWrite().
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*/
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typedef CallChainOfFunctionPointersWithContext<const GattWriteCallbackParams*> WriteCallbackChain_t;
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/**
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* Type for the registered callbacks added to the update event callchain.
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* Refer to GattClient::onHVX().
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*/
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typedef FunctionPointerWithContext<const GattHVXCallbackParams*> HVXCallback_t;
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/**
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* Type for the update event callchain. Refer to GattClient::onHVX().
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*/
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typedef CallChainOfFunctionPointersWithContext<const GattHVXCallbackParams*> HVXCallbackChain_t;
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/**
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* Type for the registered callbacks added to the shutdown callchain.
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* Refer to GattClient::onShutdown().
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*/
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typedef FunctionPointerWithContext<const GattClient *> GattClientShutdownCallback_t;
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/**
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* Type for the shutdown event callchain. Refer to GattClient::onShutown().
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*/
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typedef CallChainOfFunctionPointersWithContext<const GattClient *> GattClientShutdownCallbackChain_t;
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/*
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* The following functions are meant to be overridden in the platform-specific sub-class.
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*/
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public:
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/**
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* Launch service discovery. Once launched, application callbacks will be
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* invoked for matching services or characteristics. isServiceDiscoveryActive()
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* can be used to determine status, and a termination callback (if one was set up)
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* will be invoked at the end. Service discovery can be terminated prematurely,
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* if needed, using terminateServiceDiscovery().
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*
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* @param[in] connectionHandle
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* Handle for the connection with the peer.
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* @param[in] sc
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* This is the application callback for a matching service. Taken as
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* NULL by default. Note: service discovery may still be active
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* when this callback is issued; calling asynchronous BLE-stack
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* APIs from within this application callback might cause the
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* stack to abort service discovery. If this becomes an issue, it
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* may be better to make a local copy of the discoveredService and
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* wait for service discovery to terminate before operating on the
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* service.
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* @param[in] cc
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* This is the application callback for a matching characteristic.
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* Taken as NULL by default. Note: service discovery may still be
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* active when this callback is issued; calling asynchronous
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* BLE-stack APIs from within this application callback might cause
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* the stack to abort service discovery. If this becomes an issue,
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* it may be better to make a local copy of the discoveredCharacteristic
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* and wait for service discovery to terminate before operating on the
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* characteristic.
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* @param[in] matchingServiceUUID
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* UUID-based filter for specifying a service in which the application is
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* interested. By default it is set as the wildcard UUID_UNKNOWN,
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* in which case it matches all services. If characteristic-UUID
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* filter (below) is set to the wildcard value, then a service
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* callback will be invoked for the matching service (or for every
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* service if the service filter is a wildcard).
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* @param[in] matchingCharacteristicUUIDIn
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* UUID-based filter for specifying characteristic in which the application
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* is interested. By default it is set as the wildcard UUID_UKNOWN
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* to match against any characteristic. If both service-UUID
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* filter and characteristic-UUID filter are used with non-wildcard
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* values, then only a single characteristic callback is
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* invoked for the matching characteristic.
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*
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* @note Using wildcard values for both service-UUID and characteristic-
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* UUID will result in complete service discovery: callbacks being
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* called for every service and characteristic.
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*
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* @note Providing NULL for the characteristic callback will result in
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* characteristic discovery being skipped for each matching
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* service. This allows for an inexpensive method to discover only
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* services.
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*
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* @return
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* BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
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*/
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virtual ble_error_t launchServiceDiscovery(Gap::Handle_t connectionHandle,
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ServiceDiscovery::ServiceCallback_t sc = NULL,
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ServiceDiscovery::CharacteristicCallback_t cc = NULL,
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const UUID &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN),
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const UUID &matchingCharacteristicUUIDIn = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) {
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/* Avoid compiler warnings about unused variables. */
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(void)connectionHandle;
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(void)sc;
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(void)cc;
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(void)matchingServiceUUID;
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(void)matchingCharacteristicUUIDIn;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* Launch service discovery for services. Once launched, service discovery will remain
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* active with service-callbacks being issued back into the application for matching
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* services. isServiceDiscoveryActive() can be used to
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* determine status, and a termination callback (if set up) will be invoked
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* at the end. Service discovery can be terminated prematurely, if needed,
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* using terminateServiceDiscovery().
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*
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* @param[in] connectionHandle
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* Handle for the connection with the peer.
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* @param[in] callback
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* This is the application callback for a matching service.
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* Note: service discovery may still be active
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* when this callback is issued; calling asynchronous BLE-stack
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* APIs from within this application callback might cause the
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* stack to abort service discovery. If this becomes an issue, it
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* may be better to make a local copy of the discoveredService and
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* wait for service discovery to terminate before operating on the
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* service.
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* @param[in] matchingServiceUUID
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* UUID-based filter for specifying a service in which the application is
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* interested. By default it is set as the wildcard UUID_UNKNOWN,
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* in which case it matches all services.
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*
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* @return
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* BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
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*/
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virtual ble_error_t discoverServices(Gap::Handle_t connectionHandle,
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ServiceDiscovery::ServiceCallback_t callback,
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const UUID &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) {
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return launchServiceDiscovery(connectionHandle, callback, NULL, matchingServiceUUID); /* We take advantage of the property
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* that providing NULL for the characteristic callback will result in
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* characteristic discovery being skipped for each matching
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* service. This allows for an inexpensive method to discover only
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* services. Porters are free to override this. */
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}
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/**
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* Launch service discovery for services. Once launched, service discovery will remain
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* active with service-callbacks being issued back into the application for matching
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* services. isServiceDiscoveryActive() can be used to
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* determine status, and a termination callback (if set up) will be invoked
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* at the end. Service discovery can be terminated prematurely, if needed,
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* using terminateServiceDiscovery().
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*
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* @param[in] connectionHandle
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* Handle for the connection with the peer.
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* @param[in] callback
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* This is the application callback for a matching service.
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* Note: service discovery may still be active
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* when this callback is issued; calling asynchronous BLE-stack
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* APIs from within this application callback might cause the
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* stack to abort service discovery. If this becomes an issue, it
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* may be better to make a local copy of the discoveredService and
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* wait for service discovery to terminate before operating on the
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* service.
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* @param[in] startHandle, endHandle
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* Handle range within which to limit the search.
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*
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* @return
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* BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
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*/
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virtual ble_error_t discoverServices(Gap::Handle_t connectionHandle,
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ServiceDiscovery::ServiceCallback_t callback,
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GattAttribute::Handle_t startHandle,
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GattAttribute::Handle_t endHandle) {
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/* Avoid compiler warnings about unused variables. */
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(void)connectionHandle;
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(void)callback;
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(void)startHandle;
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(void)endHandle;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* Check if service-discovery is currently active.
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*
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* @return true if service-discovery is active, false otherwise.
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*/
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virtual bool isServiceDiscoveryActive(void) const {
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return false; /* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* Terminate an ongoing service discovery. This should result in an
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* invocation of TerminationCallback if service-discovery is active.
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*/
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virtual void terminateServiceDiscovery(void) {
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/* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* Initiate a GATT Client read procedure by attribute-handle.
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*
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* @param[in] connHandle
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* Handle for the connection with the peer.
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* @param[in] attributeHandle
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* Handle of the attribute to read data from.
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* @param[in] offset
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* The offset from the start of the attribute value to be read.
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*
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* @return
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* BLE_ERROR_NONE if read procedure was successfully started.
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*/
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virtual ble_error_t read(Gap::Handle_t connHandle, GattAttribute::Handle_t attributeHandle, uint16_t offset) const {
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/* Avoid compiler warnings about unused variables. */
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(void)connHandle;
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(void)attributeHandle;
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(void)offset;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* Initiate a GATT Client write procedure.
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*
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* @param[in] cmd
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* Command can be either a write-request (which generates a
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* matching response from the peripheral), or a write-command
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* (which doesn't require the connected peer to respond).
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* @param[in] connHandle
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* Connection handle.
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* @param[in] attributeHandle
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* Handle for the target attribtue on the remote GATT server.
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* @param[in] length
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* Length of the new value.
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* @param[in] value
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* New value being written.
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*
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* @return
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* BLE_ERROR_NONE if write procedure was successfully started.
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*/
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virtual ble_error_t write(GattClient::WriteOp_t cmd,
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Gap::Handle_t connHandle,
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GattAttribute::Handle_t attributeHandle,
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size_t length,
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const uint8_t *value) const {
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/* Avoid compiler warnings about unused variables. */
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(void)cmd;
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(void)connHandle;
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(void)attributeHandle;
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(void)length;
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(void)value;
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return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
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}
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/* Event callback handlers. */
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public:
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/**
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* Set up a callback for read response events.
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*
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* @param[in] callback
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* Event handler being registered.
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*
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* @note It is possible to chain together multiple onDataRead callbacks
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* (potentially from different modules of an application).
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*
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* @note It is possible to unregister a callback using
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* onDataRead().detach(callbackToRemove).
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*/
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void onDataRead(ReadCallback_t callback) {
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onDataReadCallbackChain.add(callback);
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}
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/**
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* @brief Provide access to the callchain of read event callbacks.
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*
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* @return A reference to the read event callback chain.
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*
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* @note It is possible to register callbacks using onDataRead().add(callback).
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*
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* @note It is possible to unregister callbacks using onDataRead().detach(callback).
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*/
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ReadCallbackChain_t& onDataRead() {
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return onDataReadCallbackChain;
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}
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/**
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* Set up a callback for write response events.
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*
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* @param[in] callback
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* Event handler being registered.
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*
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* @note It is possible to remove registered callbacks using
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* onDataWritten().detach(callbackToRemove).
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*
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* @note Write commands (issued using writeWoResponse) don't generate a response.
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*/
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void onDataWritten(WriteCallback_t callback) {
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onDataWriteCallbackChain.add(callback);
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}
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/**
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* @brief Provide access to the callchain of data written callbacks.
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*
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* @return A reference to the data written callbacks chain.
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*
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* @note It is possible to register callbacks using onDataWritten().add(callback).
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*
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* @note It is possible to unregister callbacks using onDataWritten().detach(callback).
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*/
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WriteCallbackChain_t& onDataWritten() {
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return onDataWriteCallbackChain;
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}
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/**
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* Set up a callback for write response events.
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*
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* @param[in] callback
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* Event handler being registered.
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*
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* @note Write commands (issued using writeWoResponse) don't generate a response.
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*
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* @deprecated Please use GattServer::onDataWritten() instead.
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*/
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void onDataWrite(WriteCallback_t callback) {
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onDataWritten(callback);
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}
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/**
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* Set up a callback for when serviceDiscovery terminates.
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*
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* @param[in] callback
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* Event handler being registered.
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*/
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virtual void onServiceDiscoveryTermination(ServiceDiscovery::TerminationCallback_t callback) {
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(void)callback; /* Avoid compiler warnings about ununsed variables. */
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/* Requesting action from porters: override this API if this capability is supported. */
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}
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/**
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* @brief Launch discovery of descriptors for a given characteristic.
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*
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* @details This function will discover all descriptors available for a
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* specific characteristic.
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*
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* @param[in] characteristic
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* The characteristic targeted by this discovery procedure.
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* @param[in] discoveryCallback
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* User function called each time a descriptor is found during
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* the procedure.
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* @param[in] terminationCallback
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* User provided function which will be called once the
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* discovery procedure is terminating. This will get called
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* when all the descriptors have been discovered or if an
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* error occur during the discovery procedure.
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*
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* @return
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* BLE_ERROR_NONE if characteristic descriptor discovery is launched
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* successfully; else an appropriate error.
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*/
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virtual ble_error_t discoverCharacteristicDescriptors(
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const DiscoveredCharacteristic& characteristic,
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const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
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const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback) {
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(void) characteristic;
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(void) discoveryCallback;
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(void) terminationCallback;
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/* Requesting action from porter(s): override this API if this capability is supported. */
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return BLE_ERROR_NOT_IMPLEMENTED;
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}
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/**
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* @brief Indicate if the discovery of characteristic descriptors is active
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* for a given characteristic or not.
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*
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* @param[in] characteristic
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* The characteristic concerned by the descriptors discovery.
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*
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* @return true if a descriptors discovery is active for the characteristic
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* in input; otherwise false.
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*/
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virtual bool isCharacteristicDescriptorDiscoveryActive(const DiscoveredCharacteristic& characteristic) const
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{
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(void) characteristic;
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return false; /* Requesting action from porter(s): override this API if this capability is supported. */
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}
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/**
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* @brief Terminate an ongoing characteristic descriptor discovery.
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*
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* @details This should result in an invocation of the TerminationCallback if
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* the characteristic descriptor discovery is active.
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*
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* @param[in] characteristic
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* The characteristic on which the running descriptors
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* discovery should be stopped.
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*/
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virtual void terminateCharacteristicDescriptorDiscovery(const DiscoveredCharacteristic& characteristic) {
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/* Requesting action from porter(s): override this API if this capability is supported. */
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(void) characteristic;
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}
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/**
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* Set up a callback for when the GATT Client receives an update event
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* corresponding to a change in the value of a characteristic on the remote
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* GATT Server.
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*
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* @note It is possible to unregister callbacks using
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* onHVX().detach(callbackToRemove).
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*/
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void onHVX(HVXCallback_t callback) {
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onHVXCallbackChain.add(callback);
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}
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/**
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* Setup a callback to be invoked to notify the user application that the
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* GattClient instance is about to shutdown (possibly as a result of a call
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* to BLE::shutdown()).
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*
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* @param[in] callback
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* Event handler being registered.
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*
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* @note It is possible to chain together multiple onShutdown callbacks
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* (potentially from different modules of an application) to be notified
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* before the GattClient is shutdown.
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*
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* @note It is also possible to set up a callback into a member function of
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* some object.
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*
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* @note It is possible to unregister a callback using onShutdown().detach(callback).
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*/
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void onShutdown(const GattClientShutdownCallback_t& callback) {
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shutdownCallChain.add(callback);
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}
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/**
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* Same as GattClient::onShutdown(), but allows the possibility to add an object
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* reference and member function as handler for shutdown event
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* callbacks.
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*
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* @param[in] objPtr
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* Pointer to the object of a class defining the member callback
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* function (@p memberPtr).
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* @param[in] memberPtr
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* The member callback (within the context of an object) to be
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* invoked.
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*/
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template <typename T>
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void onShutdown(T *objPtr, void (T::*memberPtr)(const GattClient *)) {
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shutdownCallChain.add(objPtr, memberPtr);
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}
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/**
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* @brief Provide access to the callchain of shutdown event callbacks.
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*
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* @return A reference to the shutdown event callbacks chain.
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*
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* @note It is possible to register callbacks using onShutdown().add(callback).
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*
|
|
* @note It is possible to unregister callbacks using onShutdown().detach(callback).
|
|
*/
|
|
GattClientShutdownCallbackChain_t& onShutdown() {
|
|
return shutdownCallChain;
|
|
}
|
|
|
|
/**
|
|
* @brief provide access to the callchain of HVX callbacks.
|
|
*
|
|
* @return A reference to the HVX callbacks chain.
|
|
*
|
|
* @note It is possible to register callbacks using onHVX().add(callback).
|
|
*
|
|
* @note It is possible to unregister callbacks using onHVX().detach(callback).
|
|
*/
|
|
HVXCallbackChain_t& onHVX() {
|
|
return onHVXCallbackChain;
|
|
}
|
|
|
|
public:
|
|
/**
|
|
* Notify all registered onShutdown callbacks that the GattClient is
|
|
* about to be shutdown and clear all GattClient state of the
|
|
* associated object.
|
|
*
|
|
* This function is meant to be overridden in the platform-specific
|
|
* sub-class. Nevertheless, the sub-class is only expected to reset its
|
|
* state and not the data held in GattClient members. This shall be achieved
|
|
* by a call to GattClient::reset() from the sub-class' reset()
|
|
* implementation.
|
|
*
|
|
* @return BLE_ERROR_NONE on success.
|
|
*/
|
|
virtual ble_error_t reset(void) {
|
|
/* Notify that the instance is about to shutdown */
|
|
shutdownCallChain.call(this);
|
|
shutdownCallChain.clear();
|
|
|
|
onDataReadCallbackChain.clear();
|
|
onDataWriteCallbackChain.clear();
|
|
onHVXCallbackChain.clear();
|
|
|
|
return BLE_ERROR_NONE;
|
|
}
|
|
|
|
protected:
|
|
GattClient() {
|
|
/* Empty */
|
|
}
|
|
|
|
/* Entry points for the underlying stack to report events back to the user. */
|
|
public:
|
|
/**
|
|
* Helper function that notifies all registered handlers of an occurrence
|
|
* of a data read event. This function is meant to be called from the
|
|
* BLE stack specific implementation when a data read event occurs.
|
|
*
|
|
* @param[in] params
|
|
* The data read parameters passed to the registered
|
|
* handlers.
|
|
*/
|
|
void processReadResponse(const GattReadCallbackParams *params) {
|
|
onDataReadCallbackChain(params);
|
|
}
|
|
|
|
/**
|
|
* Helper function that notifies all registered handlers of an occurrence
|
|
* of a data written event. This function is meant to be called from the
|
|
* BLE stack specific implementation when a data written event occurs.
|
|
*
|
|
* @param[in] params
|
|
* The data written parameters passed to the registered
|
|
* handlers.
|
|
*/
|
|
void processWriteResponse(const GattWriteCallbackParams *params) {
|
|
onDataWriteCallbackChain(params);
|
|
}
|
|
|
|
/**
|
|
* Helper function that notifies all registered handlers of an occurrence
|
|
* of an update event. This function is meant to be called from the
|
|
* BLE stack specific implementation when an update event occurs.
|
|
*
|
|
* @param[in] params
|
|
* The update event parameters passed to the registered
|
|
* handlers.
|
|
*/
|
|
void processHVXEvent(const GattHVXCallbackParams *params) {
|
|
if (onHVXCallbackChain) {
|
|
onHVXCallbackChain(params);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
/**
|
|
* Callchain containing all registered callback handlers for data read
|
|
* events.
|
|
*/
|
|
ReadCallbackChain_t onDataReadCallbackChain;
|
|
/**
|
|
* Callchain containing all registered callback handlers for data write
|
|
* events.
|
|
*/
|
|
WriteCallbackChain_t onDataWriteCallbackChain;
|
|
/**
|
|
* Callchain containing all registered callback handlers for update
|
|
* events.
|
|
*/
|
|
HVXCallbackChain_t onHVXCallbackChain;
|
|
/**
|
|
* Callchain containing all registered callback handlers for shutdown
|
|
* events.
|
|
*/
|
|
GattClientShutdownCallbackChain_t shutdownCallChain;
|
|
|
|
private:
|
|
/* Disallow copy and assignment. */
|
|
GattClient(const GattClient &);
|
|
GattClient& operator=(const GattClient &);
|
|
};
|
|
|
|
#endif /* ifndef __GATT_CLIENT_H__ */
|