Alex Cordonnier
High level Bluetooth Low Energy API and radio abstraction layer
Fork of
BLE_API
by 
Bluetooth Low Energy
Diff: ble/GattClient.h
- Revision:
- 993:4d62b7967c11
- Parent:
- 992:ca834f7ae8ed
- Child:
- 1042:21a86ac7f5b1
diff -r ca834f7ae8ed -r 4d62b7967c11 ble/GattClient.h
--- a/ble/GattClient.h Wed Dec 02 10:29:44 2015 +0000
+++ b/ble/GattClient.h Wed Dec 02 10:29:44 2015 +0000
@@ -23,18 +23,23 @@
#include "GattCallbackParamTypes.h"
+#include "CallChainOfFunctionPointersWithContext.h"
+
class GattClient {
public:
- typedef void (*ReadCallback_t)(const GattReadCallbackParams *params);
+ typedef FunctionPointerWithContext<const GattReadCallbackParams*> ReadCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<const GattReadCallbackParams*> ReadCallbackChain_t;
enum WriteOp_t {
- GATT_OP_WRITE_REQ = 0x01, /**< Write Request. */
- GATT_OP_WRITE_CMD = 0x02, /**< Write Command. */
+ GATT_OP_WRITE_REQ = 0x01, /**< Write request. */
+ GATT_OP_WRITE_CMD = 0x02, /**< Write command. */
};
- typedef void (*WriteCallback_t)(const GattWriteCallbackParams *params);
+ typedef FunctionPointerWithContext<const GattWriteCallbackParams*> WriteCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<const GattWriteCallbackParams*> WriteCallbackChain_t;
- typedef void (*HVXCallback_t)(const GattHVXCallbackParams *params);
+ typedef FunctionPointerWithContext<const GattHVXCallbackParams*> HVXCallback_t;
+ typedef CallChainOfFunctionPointersWithContext<const GattHVXCallbackParams*> HVXCallbackChain_t;
/*
* The following functions are meant to be overridden in the platform-specific sub-class.
@@ -42,48 +47,48 @@
public:
/**
* Launch service discovery. Once launched, application callbacks will be
- * invoked for matching services/characteristics. isServiceDiscoveryActive()
- * 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 terminateServiceDiscovery().
+ * invoked for matching services or characteristics. isServiceDiscoveryActive()
+ * can be used to determine status, and a termination callback (if one was set up)
+ * will be invoked at the end. Service discovery can be terminated prematurely,
+ * if needed, using terminateServiceDiscovery().
*
* @param connectionHandle
* Handle for the connection with the peer.
* @param sc
- * This is the application callback for matching service. Taken as
+ * 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 local copy of the discoveredService and
+ * 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 matching characteristic.
+ * 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 local copy of the discoveredCharacteristic
+ * 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
+ * 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
+ * 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
+ * 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
+ * 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
@@ -99,36 +104,36 @@
ServiceDiscovery::CharacteristicCallback_t cc = NULL,
const UUID &matchingServiceUUID = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN),
const UUID &matchingCharacteristicUUIDIn = UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connectionHandle;
(void)sc;
(void)cc;
(void)matchingServiceUUID;
(void)matchingCharacteristicUUIDIn;
- 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. */
}
/**
* Launch service discovery for services. Once launched, service discovery will remain
* active with service-callbacks being issued back into the application for matching
* services. isServiceDiscoveryActive() 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
+ * determine status, and a termination callback (if set up) will be invoked
+ * at the end. Service discovery can be terminated prematurely, if needed,
* using terminateServiceDiscovery().
*
* @param connectionHandle
* Handle for the connection with the peer.
* @param sc
- * This is the application callback for matching service. Note: service discovery may still be active
+ * This is the application callback for a matching service. 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
+ * may be better to make a local copy of the discoveredService and
* wait for service discovery to terminate before operating on the
* service.
* @param matchingServiceUUID
- * UUID based filter for specifying a service in which the application is
+ * 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.
*
@@ -142,29 +147,29 @@
* that 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. Porter(s) are free to override this. */
+ * services. Porters are free to override this. */
}
/**
* Launch service discovery for services. Once launched, service discovery will remain
* active with service-callbacks being issued back into the application for matching
* services. isServiceDiscoveryActive() 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
+ * determine status, and a termination callback (if set up) will be invoked
+ * at the end. Service discovery can be terminated prematurely, if needed,
* using terminateServiceDiscovery().
*
* @param connectionHandle
* Handle for the connection with the peer.
* @param sc
- * This is the application callback for matching service. Note: service discovery may still be active
+ * This is the application callback for a matching service. 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
+ * may be better to make a local copy of the discoveredService and
* wait for service discovery to terminate before operating on the
* service.
* @param startHandle, endHandle
- * Handle range within which to limit the search
+ * Handle range within which to limit the search.
*
* @return
* BLE_ERROR_NONE if service discovery is launched successfully; else an appropriate error.
@@ -173,91 +178,115 @@
ServiceDiscovery::ServiceCallback_t callback,
GattAttribute::Handle_t startHandle,
GattAttribute::Handle_t endHandle) {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connectionHandle;
(void)callback;
(void)startHandle;
(void)endHandle;
- 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. */
}
/**
* Is service-discovery currently active?
*/
virtual bool isServiceDiscoveryActive(void) 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. */
}
/**
- * Terminate an ongoing service-discovery. This should result in an
- * invocation of the TerminationCallback if service-discovery is active.
+ * Terminate an ongoing service discovery. This should result in an
+ * invocation of TerminationCallback if service-discovery is active.
*/
virtual void terminateServiceDiscovery(void) {
- /* Requesting action from porter(s): override this API if this capability is supported. */
+ /* Requesting action from porters: override this API if this capability is supported. */
}
- /* Initiate a Gatt Client read procedure by attribute-handle. */
+ /* Initiate a GATT Client read procedure by attribute-handle. */
virtual ble_error_t read(Gap::Handle_t connHandle, GattAttribute::Handle_t attributeHandle, uint16_t offset) const {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)connHandle;
(void)attributeHandle;
(void)offset;
- 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. */
}
/**
* 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,
- * which doesn't require the connected peer to respond.
+ * 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.
* @param[in] attributeHandle
- * handle for the target attribtue on the remote GATT server.
+ * Handle for the target attribtue on the remote GATT server.
* @param[in] length
- * length of the new value.
+ * Length of the new value.
* @param[in] value
- * new value being written.
+ * New value being written.
*/
virtual ble_error_t write(GattClient::WriteOp_t cmd,
Gap::Handle_t connHandle,
GattAttribute::Handle_t attributeHandle,
size_t length,
const uint8_t *value) const {
- /* avoid compiler warnings about unused variables */
+ /* Avoid compiler warnings about unused variables. */
(void)cmd;
(void)connHandle;
(void)attributeHandle;
(void)length;
(void)value;
- 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. */
}
/* Event callback handlers. */
public:
/**
- * Setup a callback for read response events.
+ * Set up a callback for read response events.
+ * It is possible to remove registered callbacks using
+ * onDataRead().detach(callbackToRemove)
*/
void onDataRead(ReadCallback_t callback) {
- onDataReadCallback = callback;
+ onDataReadCallbackChain.add(callback);
+ }
+
+ /**
+ * @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)
+ * @return The read callbacks chain
+ */
+ ReadCallbackChain_t& onDataRead() {
+ return onDataReadCallbackChain;
}
/**
- * Setup a callback for write response events.
- * @Note: write commands (issued using writeWoResponse) don't generate a response.
+ * Set up a callback for write response events.
+ * It is possible to remove registered callbacks using
+ * onDataWritten().detach(callbackToRemove).
+ * @Note: Write commands (issued using writeWoResponse) don't generate a response.
*/
void onDataWritten(WriteCallback_t callback) {
- onDataWriteCallback = callback;
+ onDataWriteCallbackChain.add(callback);
}
/**
- * Setup a callback for write response events.
- * @Note: write commands (issued using writeWoResponse) don't generate a response.
+ * @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)
+ * @return The data written callbacks chain
+ */
+ WriteCallbackChain_t& onDataWritten() {
+ return onDataWriteCallbackChain;
+ }
+
+ /**
+ * Set up a callback for write response events.
+ * @Note: Write commands (issued using writeWoResponse) don't generate a response.
*
* @note: This API is now *deprecated* and will be dropped in the future.
* Please use onDataWritten() instead.
@@ -267,55 +296,63 @@
}
/**
- * Setup callback for when serviceDiscovery terminates.
+ * Set up a callback for when serviceDiscovery terminates.
*/
virtual void onServiceDiscoveryTermination(ServiceDiscovery::TerminationCallback_t callback) {
- (void)callback; /* avoid compiler warnings about ununsed variables */
+ (void)callback; /* Avoid compiler warnings about ununsed variables. */
- /* Requesting action from porter(s): override this API if this capability is supported. */
+ /* Requesting action from porters: override this API if this capability is supported. */
}
/**
- * Setup a callback for when GattClient receives an update event
- * corresponding to a change in value of a characteristic on the remote
- * GattServer.
+ * 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.
+ * It is possible to remove registered callbacks using onHVX().detach(callbackToRemove).
*/
void onHVX(HVXCallback_t callback) {
- onHVXCallback = callback;
+ onHVXCallbackChain.add(callback);
+ }
+
+
+ /**
+ * @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)
+ * @return The HVX callbacks chain
+ */
+ HVXCallbackChain_t& onHVX() {
+ return onHVXCallbackChain;
}
protected:
GattClient() {
- /* empty */
+ /* Empty */
}
/* Entry points for the underlying stack to report events back to the user. */
public:
void processReadResponse(const GattReadCallbackParams *params) {
- if (onDataReadCallback) {
- onDataReadCallback(params);
- }
+ onDataReadCallbackChain(params);
}
void processWriteResponse(const GattWriteCallbackParams *params) {
- if (onDataWriteCallback) {
- onDataWriteCallback(params);
- }
+ onDataWriteCallbackChain(params);
}
void processHVXEvent(const GattHVXCallbackParams *params) {
- if (onHVXCallback) {
- onHVXCallback(params);
+ if (onHVXCallbackChain) {
+ onHVXCallbackChain(params);
}
}
protected:
- ReadCallback_t onDataReadCallback;
- WriteCallback_t onDataWriteCallback;
- HVXCallback_t onHVXCallback;
+ ReadCallbackChain_t onDataReadCallbackChain;
+ WriteCallbackChain_t onDataWriteCallbackChain;
+ HVXCallbackChain_t onHVXCallbackChain;
private:
- /* disallow copy and assignment */
+ /* Disallow copy and assignment. */
GattClient(const GattClient &);
GattClient& operator=(const GattClient &);
};