Diff: ble/GattClient.h

Revision:

1135:22aada733dbd

Parent:

1131:692ddf04fc42

Child:

1138:a9d4156efe16

--- a/ble/GattClient.h	Wed Apr 06 19:13:52 2016 +0100
+++ b/ble/GattClient.h	Wed Apr 06 19:13:54 2016 +0100
@@ -20,6 +20,7 @@
 #include "Gap.h"
 #include "GattAttribute.h"
 #include "ServiceDiscovery.h"
+#include "CharacteristicDescriptorDiscovery.h"
 
 #include "GattCallbackParamTypes.h"
 
@@ -41,6 +42,9 @@
     typedef FunctionPointerWithContext<const GattHVXCallbackParams*> HVXCallback_t;
     typedef CallChainOfFunctionPointersWithContext<const GattHVXCallbackParams*> HVXCallbackChain_t;
 
+    typedef FunctionPointerWithContext<const GattClient *> GattClientShutdownCallback_t;
+    typedef CallChainOfFunctionPointersWithContext<const GattClient *> GattClientShutdownCallbackChain_t;
+
     /*
      * The following functions are meant to be overridden in the platform-specific sub-class.
      */
@@ -216,8 +220,8 @@
      * Initiate a GATT Client write procedure.
      *
      * @param[in] cmd
-     *              Command can be either a write-request (which generates a 
-     *              matching response from the peripheral), or a write-command 
+     *              Command can be either a write-request (which generates a
+     *              matching response from the peripheral), or a write-command
      *              (which doesn't require the connected peer to respond).
      * @param[in] connHandle
      *              Connection handle.
@@ -246,8 +250,8 @@
     /* Event callback handlers. */
 public:
     /**
-     * Set up a callback for read response events. 
-     * It is possible to remove registered callbacks using 
+     * Set up a callback for read response events.
+     * It is possible to remove registered callbacks using
      * onDataRead().detach(callbackToRemove)
      */
     void onDataRead(ReadCallback_t callback) {
@@ -257,7 +261,7 @@
     /**
      * @brief provide access to the callchain of read callbacks
      * It is possible to register callbacks using onDataRead().add(callback);
-     * It is possible to unregister callbacks using onDataRead().detach(callback) 
+     * It is possible to unregister callbacks using onDataRead().detach(callback)
      * @return The read callbacks chain
      */
     ReadCallbackChain_t& onDataRead() {
@@ -266,7 +270,7 @@
 
     /**
      * Set up a callback for write response events.
-     * It is possible to remove registered callbacks using 
+     * It is possible to remove registered callbacks using
      * onDataWritten().detach(callbackToRemove).
      * @Note: Write commands (issued using writeWoResponse) don't generate a response.
      */
@@ -277,10 +281,10 @@
     /**
      * @brief provide access to the callchain of data written callbacks
      * It is possible to register callbacks using onDataWritten().add(callback);
-     * It is possible to unregister callbacks using onDataWritten().detach(callback) 
+     * It is possible to unregister callbacks using onDataWritten().detach(callback)
      * @return The data written callbacks chain
      */
-    WriteCallbackChain_t& onDataWritten() { 
+    WriteCallbackChain_t& onDataWritten() {
         return onDataWriteCallbackChain;
     }
 
@@ -305,6 +309,59 @@
     }
 
     /**
+     * @brief launch discovery of descriptors for a given characteristic
+     * @details This function will discover all descriptors available for a
+     * specific characteristic.
+     *
+     * @param characteristic[in] The characteristic targeted by this discovery
+     * procedure
+     * @param discoveryCallback[in] User function called each time a descriptor
+     * is found during the procedure.
+     * @param terminationCallback[in] User provided function which will be called
+     * once the discovery procedure is terminating. This will get called when all
+     * the descriptors have been discovered or if an error occur during the discovery
+     * procedure.
+     *
+     * @return
+     *   BLE_ERROR_NONE if characteristic descriptor discovery is launched
+     *   successfully; else an appropriate error.
+     */
+    virtual ble_error_t discoverCharacteristicDescriptors(
+        const DiscoveredCharacteristic& characteristic,
+        const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
+        const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback) {
+        (void) characteristic;
+        (void) discoveryCallback;
+        (void) terminationCallback;
+        /* Requesting action from porter(s): override this API if this capability is supported. */
+        return BLE_ERROR_NOT_IMPLEMENTED;
+    }
+
+    /**
+     * @brief Indicate if the discovery of characteristic descriptors is active for a given characteristic
+     * or not.
+     * @param characteristic[in] The characteristic concerned by the descriptors discovery.
+     * @return true if a descriptors discovery is active for the characteristic in input; otherwise false.
+     */
+    virtual bool isCharacteristicDescriptorDiscoveryActive(const DiscoveredCharacteristic& characteristic) const
+     {
+        (void) characteristic;
+        return false; /* Requesting action from porter(s): override this API if this capability is supported. */
+    }
+
+    /**
+     * @brief Terminate an ongoing characteristic descriptor discovery.
+     * @detail This should result in an invocation of the TerminationCallback if
+     * the characteristic descriptor discovery is active.
+     * @param characteristic[in] The characteristic on which the running descriptors
+     * discovery should be stopped.
+     */
+    virtual void terminateCharacteristicDescriptorDiscovery(const DiscoveredCharacteristic& characteristic) {
+        /* Requesting action from porter(s): override this API if this capability is supported. */
+        (void) characteristic;
+    }
+
+    /**
      * Set up a callback for when the GATT client receives an update event
      * corresponding to a change in the value of a characteristic on the remote
      * GATT server.
@@ -314,17 +371,74 @@
         onHVXCallbackChain.add(callback);
     }
 
+    /**
+     * Setup a callback to be invoked to notify the user application that the
+     * GattClient instance is about to shutdown (possibly as a result of a call
+     * to BLE::shutdown()).
+     *
+     * @Note: It is possible to chain together multiple onShutdown callbacks
+     * (potentially from different modules of an application) to be notified
+     * before the GattClient is shutdown.
+     *
+     * @Note: It is also possible to set up a callback into a member function of
+     * some object.
+     *
+     * @Note It is possible to unregister a callback using onShutdown().detach(callback)
+     */
+    void onShutdown(const GattClientShutdownCallback_t& callback) {
+        shutdownCallChain.add(callback);
+    }
+    template <typename T>
+    void onShutdown(T *objPtr, void (T::*memberPtr)(void)) {
+        shutdownCallChain.add(objPtr, memberPtr);
+    }
+
+    /**
+     * @brief provide access to the callchain of shutdown event callbacks
+     * It is possible to register callbacks using onShutdown().add(callback);
+     * It is possible to unregister callbacks using onShutdown().detach(callback)
+     * @return The shutdown event callbacks chain
+     */
+    GattClientShutdownCallbackChain_t& onShutdown() {
+        return shutdownCallChain;
+    }
 
     /**
      * @brief provide access to the callchain of HVX callbacks
      * It is possible to register callbacks using onHVX().add(callback);
-     * It is possible to unregister callbacks using onHVX().detach(callback) 
+     * It is possible to unregister callbacks using onHVX().detach(callback)
      * @return The HVX callbacks chain
      */
-    HVXCallbackChain_t& onHVX() { 
+    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 */
@@ -347,9 +461,10 @@
     }
 
 protected:
-    ReadCallbackChain_t  onDataReadCallbackChain;
-    WriteCallbackChain_t onDataWriteCallbackChain;
-    HVXCallbackChain_t   onHVXCallbackChain;
+    ReadCallbackChain_t               onDataReadCallbackChain;
+    WriteCallbackChain_t              onDataWriteCallbackChain;
+    HVXCallbackChain_t                onHVXCallbackChain;
+    GattClientShutdownCallbackChain_t shutdownCallChain;
 
 private:
     /* Disallow copy and assignment. */