Diff: ble/ServiceDiscovery.h

Revision:

710:b2e1a2660ec2

Parent:

562:ad06c59db307

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ble/ServiceDiscovery.h	Fri Jun 19 15:53:28 2015 +0100
@@ -0,0 +1,143 @@
+/* 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 in order to work with the service beyond the callback.
+     */
+    typedef void (*ServiceCallback_t)(const DiscoveredService *);
+
+    /**
+     * 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 in order to work with the characteristic beyond the callback.
+     */
+    typedef void (*CharacteristicCallback_t)(const DiscoveredCharacteristic *);
+
+    /**
+     * Callback type for when serviceDiscovery terminates.
+     */
+    typedef void (*TerminationCallback_t)(Gap::Handle_t connectionHandle);
+
+public:
+    /**
+     * Launch service discovery. Once launched, service discovery will remain
+     * active with callbacks being issued back into the application for matching
+     * services/characteristics. isActive() can be used to determine status; and
+     * a termination callback (if setup) 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 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 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 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 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 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;
+
+    /**
+     * Is service-discovery 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;
+
+    /**
+     * Setup callback to be invoked when service discovery is terminated.
+     */
+    virtual void        onTermination(TerminationCallback_t callback) = 0;
+
+protected:
+    Gap::Handle_t            connHandle; /**< Connection handle as provided by the SoftDevice. */
+    UUID                     matchingServiceUUID;
+    ServiceCallback_t        serviceCallback;
+    UUID                     matchingCharacteristicUUID;
+    CharacteristicCallback_t characteristicCallback;
+};
+
+#endif // ifndef __SERVICE_DISOVERY_H__
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