Alex Cordonnier / BLE_API

High level Bluetooth Low Energy API and radio abstraction layer

Fork of BLE_API by Bluetooth Low Energy

ble/ServiceDiscovery.h@958:9da2140ecec8, 2015-11-26 (annotated)

Committer:
rgrover1
Date:
Thu Nov 26 12:52:33 2015 +0000
Revision:
958:9da2140ecec8
Parent:
949:1902cbd0dd83
Child:
966:9451b90bbb66
Synchronized with git rev acf4467c

Author: Vincent Coubard

Replace callbacks with function pointer into FunctionPointer object

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 716:11b41f651697 1 /* mbed Microcontroller Library
rgrover1 716:11b41f651697 2 * Copyright (c) 2006-2013 ARM Limited
rgrover1 716:11b41f651697 3 *
rgrover1 716:11b41f651697 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 716:11b41f651697 5 * you may not use this file except in compliance with the License.
rgrover1 716:11b41f651697 6 * You may obtain a copy of the License at
rgrover1 716:11b41f651697 7 *
rgrover1 716:11b41f651697 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 716:11b41f651697 9 *
rgrover1 716:11b41f651697 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 716:11b41f651697 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 716:11b41f651697 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 716:11b41f651697 13 * See the License for the specific language governing permissions and
rgrover1 716:11b41f651697 14 * limitations under the License.
rgrover1 716:11b41f651697 15 */
rgrover1 716:11b41f651697 16
rgrover1 716:11b41f651697 17 #ifndef __SERVICE_DISOVERY_H__
rgrover1 716:11b41f651697 18 #define __SERVICE_DISOVERY_H__
rgrover1 716:11b41f651697 19
rgrover1 716:11b41f651697 20 #include "UUID.h"
rgrover1 716:11b41f651697 21 #include "Gap.h"
rgrover1 716:11b41f651697 22 #include "GattAttribute.h"
rgrover1 716:11b41f651697 23
rgrover1 716:11b41f651697 24 class DiscoveredService;
rgrover1 716:11b41f651697 25 class DiscoveredCharacteristic;
rgrover1 716:11b41f651697 26
rgrover1 716:11b41f651697 27 class ServiceDiscovery {
rgrover1 716:11b41f651697 28 public:
rgrover1 716:11b41f651697 29 /*
rgrover1 716:11b41f651697 30 * Exposed application callback types.
rgrover1 716:11b41f651697 31 */
rgrover1 716:11b41f651697 32
rgrover1 716:11b41f651697 33 /**
rgrover1 937:4932e700daf2 34 * Callback type for when a matching service is found during service-
rgrover1 716:11b41f651697 35 * discovery. The receiving function is passed in a pointer to a
rgrover1 937:4932e700daf2 36 * DiscoveredService object, which will remain valid for the lifetime of the
rgrover1 716:11b41f651697 37 * callback. Memory for this object is owned by the BLE_API eventing
rgrover1 716:11b41f651697 38 * framework. The application can safely make a persistent shallow-copy of
rgrover1 937:4932e700daf2 39 * this object to work with the service beyond the callback.
rgrover1 716:11b41f651697 40 */
rgrover1 958:9da2140ecec8 41 typedef FunctionPointerWithContext<const DiscoveredService *> ServiceCallback_t;
rgrover1 716:11b41f651697 42
rgrover1 716:11b41f651697 43 /**
rgrover1 937:4932e700daf2 44 * Callback type for when a matching characteristic is found during service-
rgrover1 716:11b41f651697 45 * discovery. The receiving function is passed in a pointer to a
rgrover1 937:4932e700daf2 46 * DiscoveredCharacteristic object, which will remain valid for the lifetime
rgrover1 716:11b41f651697 47 * of the callback. Memory for this object is owned by the BLE_API eventing
rgrover1 716:11b41f651697 48 * framework. The application can safely make a persistent shallow-copy of
rgrover1 937:4932e700daf2 49 * this object to work with the characteristic beyond the callback.
rgrover1 716:11b41f651697 50 */
rgrover1 958:9da2140ecec8 51 typedef FunctionPointerWithContext<const DiscoveredCharacteristic *> CharacteristicCallback_t;
rgrover1 716:11b41f651697 52
rgrover1 716:11b41f651697 53 /**
rgrover1 716:11b41f651697 54 * Callback type for when serviceDiscovery terminates.
rgrover1 716:11b41f651697 55 */
rgrover1 958:9da2140ecec8 56 typedef FunctionPointerWithContext<Gap::Handle_t> TerminationCallback_t;
rgrover1 716:11b41f651697 57
rgrover1 716:11b41f651697 58 public:
rgrover1 716:11b41f651697 59 /**
rgrover1 716:11b41f651697 60 * Launch service discovery. Once launched, service discovery will remain
rgrover1 716:11b41f651697 61 * active with callbacks being issued back into the application for matching
rgrover1 937:4932e700daf2 62 * services or characteristics. isActive() can be used to determine status, and
rgrover1 937:4932e700daf2 63 * a termination callback (if set up) will be invoked at the end. Service
rgrover1 937:4932e700daf2 64 * discovery can be terminated prematurely, if needed, using terminate().
rgrover1 716:11b41f651697 65 *
rgrover1 716:11b41f651697 66 * @param connectionHandle
rgrover1 716:11b41f651697 67 * Handle for the connection with the peer.
rgrover1 716:11b41f651697 68 * @param sc
rgrover1 937:4932e700daf2 69 * This is the application callback for a matching service. Taken as
rgrover1 716:11b41f651697 70 * NULL by default. Note: service discovery may still be active
rgrover1 716:11b41f651697 71 * when this callback is issued; calling asynchronous BLE-stack
rgrover1 716:11b41f651697 72 * APIs from within this application callback might cause the
rgrover1 716:11b41f651697 73 * stack to abort service discovery. If this becomes an issue, it
rgrover1 937:4932e700daf2 74 * may be better to make a local copy of the discoveredService and
rgrover1 716:11b41f651697 75 * wait for service discovery to terminate before operating on the
rgrover1 716:11b41f651697 76 * service.
rgrover1 716:11b41f651697 77 * @param cc
rgrover1 937:4932e700daf2 78 * This is the application callback for a matching characteristic.
rgrover1 716:11b41f651697 79 * Taken as NULL by default. Note: service discovery may still be
rgrover1 716:11b41f651697 80 * active when this callback is issued; calling asynchronous
rgrover1 716:11b41f651697 81 * BLE-stack APIs from within this application callback might cause
rgrover1 716:11b41f651697 82 * the stack to abort service discovery. If this becomes an issue,
rgrover1 937:4932e700daf2 83 * it may be better to make a local copy of the discoveredCharacteristic
rgrover1 716:11b41f651697 84 * and wait for service discovery to terminate before operating on the
rgrover1 716:11b41f651697 85 * characteristic.
rgrover1 716:11b41f651697 86 * @param matchingServiceUUID
rgrover1 937:4932e700daf2 87 * UUID-based filter for specifying a service in which the application is
rgrover1 716:11b41f651697 88 * interested. By default it is set as the wildcard UUID_UNKNOWN,
rgrover1 716:11b41f651697 89 * in which case it matches all services. If characteristic-UUID
rgrover1 716:11b41f651697 90 * filter (below) is set to the wildcard value, then a service
rgrover1 716:11b41f651697 91 * callback will be invoked for the matching service (or for every
rgrover1 716:11b41f651697 92 * service if the service filter is a wildcard).
rgrover1 716:11b41f651697 93 * @param matchingCharacteristicUUIDIn
rgrover1 937:4932e700daf2 94 * UUID-based filter for specifying a characteristic in which the application
rgrover1 716:11b41f651697 95 * is interested. By default it is set as the wildcard UUID_UKNOWN
rgrover1 716:11b41f651697 96 * to match against any characteristic. If both service-UUID
rgrover1 937:4932e700daf2 97 * filter and characteristic-UUID filter are used with non-wildcard
rgrover1 716:11b41f651697 98 * values, then only a single characteristic callback is
rgrover1 716:11b41f651697 99 * invoked for the matching characteristic.
rgrover1 716:11b41f651697 100 *
rgrover1 716:11b41f651697 101 * @note Using wildcard values for both service-UUID and characteristic-
rgrover1 937:4932e700daf2 102 * UUID will result in complete service discovery: callbacks being
rgrover1 716:11b41f651697 103 * called for every service and characteristic.
rgrover1 716:11b41f651697 104 *
rgrover1 716:11b41f651697 105 * @note Providing NULL for the characteristic callback will result in
rgrover1 716:11b41f651697 106 * characteristic discovery being skipped for each matching
rgrover1 716:11b41f651697 107 * service. This allows for an inexpensive method to discover only
rgrover1 716:11b41f651697 108 * services.
rgrover1 716:11b41f651697 109 *
rgrover1 716:11b41f651697 110 * @return
rgrover1 716:11b41f651697 111 * BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
rgrover1 716:11b41f651697 112 */
rgrover1 716:11b41f651697 113 virtual ble_error_t launch(Gap::Handle_t connectionHandle,
rgrover1 716:11b41f651697 114 ServiceCallback_t sc = NULL,
rgrover1 716:11b41f651697 115 CharacteristicCallback_t cc = NULL,
rgrover1 716:11b41f651697 116 const UUID &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN),
rgrover1 716:11b41f651697 117 const UUID &matchingCharacteristicUUIDIn = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) = 0;
rgrover1 716:11b41f651697 118
rgrover1 716:11b41f651697 119 /**
rgrover1 716:11b41f651697 120 * Is service-discovery currently active?
rgrover1 716:11b41f651697 121 */
rgrover1 716:11b41f651697 122 virtual bool isActive(void) const = 0;
rgrover1 716:11b41f651697 123
rgrover1 716:11b41f651697 124 /**
rgrover1 937:4932e700daf2 125 * Terminate an ongoing service discovery. This should result in an
rgrover1 937:4932e700daf2 126 * invocation of the TerminationCallback if service discovery is active.
rgrover1 716:11b41f651697 127 */
rgrover1 716:11b41f651697 128 virtual void terminate(void) = 0;
rgrover1 716:11b41f651697 129
rgrover1 716:11b41f651697 130 /**
rgrover1 937:4932e700daf2 131 * Set up a callback to be invoked when service discovery is terminated.
rgrover1 716:11b41f651697 132 */
rgrover1 716:11b41f651697 133 virtual void onTermination(TerminationCallback_t callback) = 0;
rgrover1 716:11b41f651697 134
rgrover1 716:11b41f651697 135 protected:
rgrover1 716:11b41f651697 136 Gap::Handle_t connHandle; /**< Connection handle as provided by the SoftDevice. */
rgrover1 716:11b41f651697 137 UUID matchingServiceUUID;
rgrover1 716:11b41f651697 138 ServiceCallback_t serviceCallback;
rgrover1 716:11b41f651697 139 UUID matchingCharacteristicUUID;
rgrover1 716:11b41f651697 140 CharacteristicCallback_t characteristicCallback;
rgrover1 716:11b41f651697 141 };
rgrover1 716:11b41f651697 142
rgrover1 716:11b41f651697 143 #endif // ifndef __SERVICE_DISOVERY_H__