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Bluetooth Low Energy
Diff: ble/GattServer.h
- Revision:
- 993:4d62b7967c11
- Parent:
- 992:ca834f7ae8ed
- Child:
- 1042:21a86ac7f5b1
diff -r ca834f7ae8ed -r 4d62b7967c11 ble/GattServer.h
--- a/ble/GattServer.h Wed Dec 02 10:29:44 2015 +0000
+++ b/ble/GattServer.h Wed Dec 02 10:29:44 2015 +0000
@@ -26,9 +26,18 @@
class GattServer {
public:
+
/* Event callback handlers. */
- typedef void (*EventCallback_t)(GattAttribute::Handle_t attributeHandle);
- typedef void (*ServerEventCallback_t)(void); /**< independent of any particular attribute */
+ typedef FunctionPointerWithContext<unsigned> DataSentCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<unsigned> DataSentCallbackChain_t;
+
+ typedef FunctionPointerWithContext<const GattWriteCallbackParams*> DataWrittenCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<const GattWriteCallbackParams*> DataWrittenCallbackChain_t;
+
+ typedef FunctionPointerWithContext<const GattReadCallbackParams*> DataReadCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<const GattReadCallbackParams *> DataReadCallbackChain_t;
+
+ typedef FunctionPointerWithContext<GattAttribute::Handle_t> EventCallback_t;
protected:
GattServer() :
@@ -53,14 +62,14 @@
* characteristics contained within.
*/
virtual ble_error_t addService(GattService &service) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)service;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Read the value of a characteristic from the local GattServer
+ * Read the value of a characteristic from the local GATT server.
* @param[in] attributeHandle
* Attribute handle for the value attribute of the characteristic.
* @param[out] buffer
@@ -75,18 +84,18 @@
* @return BLE_ERROR_NONE if a value was read successfully into the buffer.
*/
virtual ble_error_t read(GattAttribute::Handle_t attributeHandle, uint8_t buffer[], uint16_t *lengthP) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)attributeHandle;
(void)buffer;
(void)lengthP;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Read the value of a characteristic from the local GattServer
+ * Read the value of a characteristic from the local GATT server.
* @param[in] connectionHandle
- * Connection Handle.
+ * Connection handle.
* @param[in] attributeHandle
* Attribute handle for the value attribute of the characteristic.
* @param[out] buffer
@@ -100,32 +109,32 @@
*
* @return BLE_ERROR_NONE if a value was read successfully into the buffer.
*
- * @note This API is a version of above with an additional connection handle
+ * @note This API is a version of the above, with an additional connection handle
* parameter to allow fetches for connection-specific multivalued
* attributes (such as the CCCDs).
*/
virtual ble_error_t read(Gap::Handle_t connectionHandle, GattAttribute::Handle_t attributeHandle, uint8_t *buffer, uint16_t *lengthP) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connectionHandle;
(void)attributeHandle;
(void)buffer;
(void)lengthP;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Update the value of a characteristic on the local GattServer.
+ * Update the value of a characteristic on the local GATT server.
*
* @param[in] attributeHandle
- * Handle for the value attribute of the Characteristic.
+ * Handle for the value attribute of the characteristic.
* @param[in] value
- * A pointer to a buffer holding the new value
+ * A pointer to a buffer holding the new value.
* @param[in] size
* Size of the new value (in bytes).
* @param[in] localOnly
* Should this update be kept on the local
- * GattServer regardless of the state of the
+ * GATT server regardless of the state of the
* notify/indicate flag in the CCCD for this
* Characteristic? If set to true, no notification
* or indication is generated.
@@ -133,26 +142,26 @@
* @return BLE_ERROR_NONE if we have successfully set the value of the attribute.
*/
virtual ble_error_t write(GattAttribute::Handle_t attributeHandle, const uint8_t *value, uint16_t size, bool localOnly = false) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)attributeHandle;
(void)value;
(void)size;
(void)localOnly;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Update the value of a characteristic on the local GattServer. A version
- * of the same as above with connection handle parameter to allow updates
+ * Update the value of a characteristic on the local GATT server. A version
+ * of the same as the above, with a connection handle parameter to allow updates
* for connection-specific multivalued attributes (such as the CCCDs).
*
* @param[in] connectionHandle
- * Connection Handle.
+ * Connection handle.
* @param[in] attributeHandle
- * Handle for the value attribute of the Characteristic.
+ * Handle for the value attribute of the characteristic.
* @param[in] value
- * A pointer to a buffer holding the new value
+ * A pointer to a buffer holding the new value.
* @param[in] size
* Size of the new value (in bytes).
* @param[in] localOnly
@@ -165,54 +174,54 @@
* @return BLE_ERROR_NONE if we have successfully set the value of the attribute.
*/
virtual ble_error_t write(Gap::Handle_t connectionHandle, GattAttribute::Handle_t attributeHandle, const uint8_t *value, uint16_t size, bool localOnly = false) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connectionHandle;
(void)attributeHandle;
(void)value;
(void)size;
(void)localOnly;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Determine the updates-enabled status (notification/indication) for the current connection from a characteristic's CCCD.
+ * Determine the updates-enabled status (notification or indication) for the current connection from a characteristic's CCCD.
*
* @param characteristic
- * The characteristic
+ * The characteristic.
* @param[out] enabledP
* Upon return, *enabledP is true if updates are enabled, else false.
*
- * @return BLE_ERROR_NONE if the connection and handle are found. false otherwise.
+ * @return BLE_ERROR_NONE if the connection and handle are found. False otherwise.
*/
virtual ble_error_t areUpdatesEnabled(const GattCharacteristic &characteristic, bool *enabledP) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)characteristic;
(void)enabledP;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Determine the connection-specific updates-enabled status (notification/indication) from a characteristic's CCCD.
+ * Determine the connection-specific updates-enabled status (notification or indication) from a characteristic's CCCD.
*
* @param connectionHandle
- * The connection handle
+ * The connection handle.
* @param[out] enabledP
* Upon return, *enabledP is true if updates are enabled, else false.
*
* @param characteristic
- * The characteristic
+ * The characteristic.
*
- * @return BLE_ERROR_NONE if the connection and handle are found. false otherwise.
+ * @return BLE_ERROR_NONE if the connection and handle are found. False otherwise.
*/
virtual ble_error_t areUpdatesEnabled(Gap::Handle_t connectionHandle, const GattCharacteristic &characteristic, bool *enabledP) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connectionHandle;
(void)characteristic;
(void)enabledP;
- return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return BLE_ERROR_NOT_IMPLEMENTED; /* Requesting action from porters: override this API if this capability is supported. */
}
/**
@@ -220,7 +229,7 @@
* onDataRead(). It should be overridden to return true as applicable.
*/
virtual bool isOnDataReadAvailable() const {
- return false; /* Requesting action from porter(s): override this API if this capability is supported. */
+ return false; /* Requesting action from porters: override this API if this capability is supported. */
}
/*
@@ -231,60 +240,81 @@
* Add a callback for the GATT event DATA_SENT (which is triggered when
* updates are sent out by GATT in the form of notifications).
*
- * @Note: it is possible to chain together multiple onDataSent callbacks
+ * @Note: It is possible to chain together multiple onDataSent callbacks
* (potentially from different modules of an application) to receive updates
* to characteristics.
*
- * @Note: it is also possible to setup a callback into a member function of
+ * @Note: It is also possible to set up a callback into a member function of
* some object.
*/
- void onDataSent(void (*callback)(unsigned count)) {dataSentCallChain.add(callback);}
+ void onDataSent(const DataSentCallback_t& callback) {dataSentCallChain.add(callback);}
template <typename T>
void onDataSent(T *objPtr, void (T::*memberPtr)(unsigned count)) {
dataSentCallChain.add(objPtr, memberPtr);
}
/**
- * Setup a callback for when an attribute has its value updated by or at the
- * connected peer. For a peripheral, this callback triggered when the local
+ * @brief get the callback chain called when the event DATA_EVENT is triggered.
+ */
+ DataSentCallbackChain_t& onDataSent() {
+ return dataSentCallChain;
+ }
+
+ /**
+ * Set up a callback for when an attribute has its value updated by or at the
+ * connected peer. For a peripheral, this callback is triggered when the local
* GATT server has an attribute updated by a write command from the peer.
- * For a Central, this callback is triggered when a response is received for
+ * For a central, this callback is triggered when a response is received for
* a write request.
*
- * @Note: it is possible to chain together multiple onDataWritten callbacks
+ * @Note: It is possible to chain together multiple onDataWritten callbacks
* (potentially from different modules of an application) to receive updates
- * to characteristics. Many services, such as DFU and UART add their own
+ * to characteristics. Many services, such as DFU and UART, add their own
* onDataWritten callbacks behind the scenes to trap interesting events.
*
- * @Note: it is also possible to setup a callback into a member function of
+ * @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 onDataWritten().detach(callback)
*/
- void onDataWritten(void (*callback)(const GattWriteCallbackParams *eventDataP)) {dataWrittenCallChain.add(callback);}
+ void onDataWritten(const DataWrittenCallback_t& callback) {dataWrittenCallChain.add(callback);}
template <typename T>
void onDataWritten(T *objPtr, void (T::*memberPtr)(const GattWriteCallbackParams *context)) {
dataWrittenCallChain.add(objPtr, memberPtr);
}
/**
+ * @brief provide access to the callchain of data written event callbacks
+ * It is possible to register callbacks using onDataWritten().add(callback);
+ * It is possible to unregister callbacks using onDataWritten().detach(callback)
+ * @return The data written event callbacks chain
+ */
+ DataWrittenCallbackChain_t& onDataWritten() {
+ return dataWrittenCallChain;
+ }
+
+ /**
* Setup a callback to be invoked on the peripheral when an attribute is
* being read by a remote client.
*
- * @Note: this functionality may not be available on all underlying stacks.
+ * @Note: This functionality may not be available on all underlying stacks.
* You could use GattCharacteristic::setReadAuthorizationCallback() as an
* alternative. Refer to isOnDataReadAvailable().
*
- * @Note: it is possible to chain together multiple onDataRead callbacks
+ * @Note: It is possible to chain together multiple onDataRead callbacks
* (potentially from different modules of an application) to receive updates
* to characteristics. Services may add their own onDataRead callbacks
* behind the scenes to trap interesting events.
*
- * @Note: it is also possible to setup a callback into a member function of
+ * @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 onDataRead().detach(callback)
+ *
* @return BLE_ERROR_NOT_IMPLEMENTED if this functionality isn't available;
* else BLE_ERROR_NONE.
*/
- ble_error_t onDataRead(void (*callback)(const GattReadCallbackParams *eventDataP)) {
+ ble_error_t onDataRead(const DataReadCallback_t& callback) {
if (!isOnDataReadAvailable()) {
return BLE_ERROR_NOT_IMPLEMENTED;
}
@@ -303,19 +333,29 @@
}
/**
- * Setup a callback for when notifications/indications are enabled for a
- * characteristic on the local GattServer.
+ * @brief provide access to the callchain of data read event callbacks
+ * It is possible to register callbacks using onDataRead().add(callback);
+ * It is possible to unregister callbacks using onDataRead().detach(callback)
+ * @return The data read event callbacks chain
+ */
+ DataReadCallbackChain_t& onDataRead() {
+ return dataReadCallChain;
+ }
+
+ /**
+ * Set up a callback for when notifications or indications are enabled for a
+ * characteristic on the local GATT server.
*/
void onUpdatesEnabled(EventCallback_t callback) {updatesEnabledCallback = callback;}
/**
- * Setup a callback for when notifications/indications are disabled for a
- * characteristic on the local GattServer.
+ * Set up a callback for when notifications or indications are disabled for a
+ * characteristic on the local GATT server.
*/
void onUpdatesDisabled(EventCallback_t callback) {updatesDisabledCallback = callback;}
/**
- * Setup a callback for when the GATT server receives a response for an
+ * Set up a callback for when the GATT server receives a response for an
* indication event sent previously.
*/
void onConfirmationReceived(EventCallback_t callback) {confirmationReceivedCallback = callback;}
@@ -323,15 +363,11 @@
/* Entry points for the underlying stack to report events back to the user. */
protected:
void handleDataWrittenEvent(const GattWriteCallbackParams *params) {
- if (dataWrittenCallChain.hasCallbacksAttached()) {
- dataWrittenCallChain.call(params);
- }
+ dataWrittenCallChain.call(params);
}
void handleDataReadEvent(const GattReadCallbackParams *params) {
- if (dataReadCallChain.hasCallbacksAttached()) {
- dataReadCallChain.call(params);
- }
+ dataReadCallChain.call(params);
}
void handleEvent(GattServerEvents::gattEvent_e type, GattAttribute::Handle_t attributeHandle) {
@@ -357,9 +393,7 @@
}
void handleDataSentEvent(unsigned count) {
- if (dataSentCallChain.hasCallbacksAttached()) {
- dataSentCallChain.call(count);
- }
+ dataSentCallChain.call(count);
}
protected:
@@ -367,15 +401,15 @@
uint8_t characteristicCount;
private:
- CallChainOfFunctionPointersWithContext<unsigned> dataSentCallChain;
- CallChainOfFunctionPointersWithContext<const GattWriteCallbackParams *> dataWrittenCallChain;
- CallChainOfFunctionPointersWithContext<const GattReadCallbackParams *> dataReadCallChain;
- EventCallback_t updatesEnabledCallback;
- EventCallback_t updatesDisabledCallback;
- EventCallback_t confirmationReceivedCallback;
+ DataSentCallbackChain_t dataSentCallChain;
+ DataWrittenCallbackChain_t dataWrittenCallChain;
+ DataReadCallbackChain_t dataReadCallChain;
+ EventCallback_t updatesEnabledCallback;
+ EventCallback_t updatesDisabledCallback;
+ EventCallback_t confirmationReceivedCallback;
private:
- /* disallow copy and assignment */
+ /* Disallow copy and assignment. */
GattServer(const GattServer &);
GattServer& operator=(const GattServer &);
};