Simon Cooksey
Pinned to some recent date
Diff: features/FEATURE_BLE/ble/ServiceDiscovery.h
- Revision:
- 0:fb7af294d5d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/FEATURE_BLE/ble/ServiceDiscovery.h Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,183 @@
+/* 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 __SERVICE_DISOVERY_H__
+#define __SERVICE_DISOVERY_H__
+
+#include "UUID.h"
+#include "Gap.h"
+#include "GattAttribute.h"
+
+class DiscoveredService;
+class DiscoveredCharacteristic;
+
+class ServiceDiscovery {
+public:
+ /*
+ * Exposed application callback types.
+ */
+
+ /**
+ * Callback type for when a matching service is found during service-
+ * discovery. The receiving function is passed in a pointer to a
+ * DiscoveredService 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 to work with the service beyond the callback.
+ */
+ typedef FunctionPointerWithContext<const DiscoveredService *> ServiceCallback_t;
+
+ /**
+ * Callback type for when a matching characteristic is found during service-
+ * discovery. The receiving function is passed in a pointer to a
+ * DiscoveredCharacteristic 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 to work with the characteristic beyond the callback.
+ */
+ typedef FunctionPointerWithContext<const DiscoveredCharacteristic *> CharacteristicCallback_t;
+
+ /**
+ * Callback type for when serviceDiscovery terminates.
+ */
+ typedef FunctionPointerWithContext<Gap::Handle_t> TerminationCallback_t;
+
+public:
+ /**
+ * Launch service discovery. Once launched, service discovery will remain
+ * active with callbacks being issued back into the application for matching
+ * services or characteristics. isActive() can be used to determine status, and
+ * a termination callback (if set up) will be invoked at the end. Service
+ * discovery can be terminated prematurely, if needed, using terminate().
+ *
+ * @param connectionHandle
+ * Handle for the connection with the peer.
+ * @param sc
+ * This is the application callback for a matching service. Taken as
+ * NULL by default. Note: service discovery may still be active
+ * when this callback is issued; calling asynchronous BLE-stack
+ * APIs from within this application callback might cause the
+ * stack to abort service discovery. If this becomes an issue, it
+ * may be better to make a local copy of the discoveredService and
+ * wait for service discovery to terminate before operating on the
+ * service.
+ * @param cc
+ * This is the application callback for a matching characteristic.
+ * Taken as NULL by default. Note: service discovery may still be
+ * active when this callback is issued; calling asynchronous
+ * BLE-stack APIs from within this application callback might cause
+ * the stack to abort service discovery. If this becomes an issue,
+ * it may be better to make a local copy of the discoveredCharacteristic
+ * and wait for service discovery to terminate before operating on the
+ * characteristic.
+ * @param matchingServiceUUID
+ * UUID-based filter for specifying a service in which the application is
+ * interested. By default it is set as the wildcard UUID_UNKNOWN,
+ * in which case it matches all services. If characteristic-UUID
+ * filter (below) is set to the wildcard value, then a service
+ * callback will be invoked for the matching service (or for every
+ * service if the service filter is a wildcard).
+ * @param matchingCharacteristicUUIDIn
+ * UUID-based filter for specifying a characteristic in which the application
+ * is interested. By default it is set as the wildcard UUID_UKNOWN
+ * to match against any characteristic. If both service-UUID
+ * filter and characteristic-UUID filter are used with non-wildcard
+ * values, then only a single characteristic callback is
+ * invoked for the matching characteristic.
+ *
+ * @note Using wildcard values for both service-UUID and characteristic-
+ * UUID will result in complete service discovery: callbacks being
+ * called for every service and characteristic.
+ *
+ * @note Providing NULL for the characteristic callback will result in
+ * characteristic discovery being skipped for each matching
+ * service. This allows for an inexpensive method to discover only
+ * services.
+ *
+ * @return
+ * BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
+ */
+ virtual ble_error_t launch(Gap::Handle_t connectionHandle,
+ ServiceCallback_t sc = NULL,
+ CharacteristicCallback_t cc = NULL,
+ const UUID &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN),
+ const UUID &matchingCharacteristicUUIDIn = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) = 0;
+
+ /**
+ * Check whether service-discovery is currently active.
+ */
+ virtual bool isActive(void) const = 0;
+
+ /**
+ * Terminate an ongoing service discovery. This should result in an
+ * invocation of the TerminationCallback if service discovery is active.
+ */
+ virtual void terminate(void) = 0;
+
+ /**
+ * Set up a callback to be invoked when service discovery is terminated.
+ */
+ virtual void onTermination(TerminationCallback_t callback) = 0;
+
+ /**
+ * Clear all ServiceDiscovery 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 ServiceDiscovery members. This shall be
+ * achieved by a call to ServiceDiscovery::reset() from the sub-class'
+ * reset() implementation.
+ *
+ * @return BLE_ERROR_NONE on success.
+ */
+ virtual ble_error_t reset(void) {
+ connHandle = 0;
+ matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN);
+ serviceCallback = NULL;
+ matchingCharacteristicUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN);
+ characteristicCallback = NULL;
+
+ return BLE_ERROR_NONE;
+ }
+
+protected:
+ /**
+ * Connection handle as provided by the SoftDevice.
+ */
+ Gap::Handle_t connHandle;
+ /**
+ * UUID-based filter that specifies the service that the application is
+ * interested in.
+ */
+ UUID matchingServiceUUID;
+ /**
+ * The registered callback handle for when a matching service is found
+ * during service-discovery.
+ */
+ ServiceCallback_t serviceCallback;
+ /**
+ * UUID-based filter that specifies the characteristic that the
+ * application is interested in.
+ */
+ UUID matchingCharacteristicUUID;
+ /**
+ * The registered callback handler for when a matching characteristic is
+ * found during service-discovery.
+ */
+ CharacteristicCallback_t characteristicCallback;
+};
+
+#endif /* ifndef __SERVICE_DISOVERY_H__ */