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microbit: Additional callback to indicate to applications when System

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Attributes require initialisation from persistent storage.
This commit is contained in:
Joe Finney 2016-02-11 21:59:51 +00:00
parent 33935ace89
commit bbc2dc58f8
3 changed files with 45 additions and 1 deletions
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4
ble/GattCallbackParamTypes.h
View file

@ -44,6 +44,10 @@ struct GattReadCallbackParams {
const uint8_t *data; /* @note: Data might not persist beyond the callback; make a local copy if needed. */
};
struct GattSysAttrMissingCallbackParams {
Gap::Handle_t connHandle;
};
enum GattAuthCallbackReply_t {
AUTH_CALLBACK_REPLY_SUCCESS = 0x00, /**< Success. */
AUTH_CALLBACK_REPLY_ATTERR_INVALID_HANDLE = 0x0101, /**< ATT Error: Invalid attribute handle. */

40
ble/GattServer.h
View file

@ -39,6 +39,9 @@ public:
typedef FunctionPointerWithContext<const GattServer *> GattServerShutdownCallback_t;
typedef CallChainOfFunctionPointersWithContext<const GattServer *> GattServerShutdownCallbackChain_t;
typedef FunctionPointerWithContext<const GattSysAttrMissingCallbackParams*> SysAttrMissingCallback_t;
typedef CallChainOfFunctionPointersWithContext<const GattSysAttrMissingCallbackParams*> SysAttrMissingCallbackChain_t;
typedef FunctionPointerWithContext<GattAttribute::Handle_t> EventCallback_t;
protected:
@ -48,6 +51,7 @@ protected:
dataSentCallChain(),
dataWrittenCallChain(),
dataReadCallChain(),
sysAttrMissingCallChain(),
updatesEnabledCallback(NULL),
updatesDisabledCallback(NULL),
confirmationReceivedCallback(NULL) {
@ -316,6 +320,36 @@ public:
return dataWrittenCallChain;
}
/**
* Set up a callback for when asystem descriptor (CCCD) is missing.
* This may be raised in response to a BLE profile change om a bonded connection.
* This callback provides the opportunity for user applications to restore
* CCCD state at the appropriate time.
*
* @Note: It is possible to chain together multiple onSysAttrMissing callbacks
* (potentially from different modules of an application), although it is unlikely
* that this will be beneficial.
*
* @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 onSysAttrMissing().detach(callback)
*/
void onSysAttrMissing(const SysAttrMissingCallback_t& callback) {sysAttrMissingCallChain.add(callback);}
template <typename T>
void onSysAttrMissing(T *objPtr, void (T::*memberPtr)(const GattSysAttrMissingCallbackParams* connectionHandle)) {
sysAttrMissingCallChain.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
*/
SysAttrMissingCallbackChain_t& onSysAttrMissing() {
return sysAttrMissingCallChain;
}
/**
* Setup a callback to be invoked on the peripheral when an attribute is
* being read by a remote client.
@ -417,6 +451,10 @@ public:
/* Entry points for the underlying stack to report events back to the user. */
protected:
void handleSysAttrMissingEvent(const GattSysAttrMissingCallbackParams *params) {
sysAttrMissingCallChain.call(params);
}
void handleDataWrittenEvent(const GattWriteCallbackParams *params) {
dataWrittenCallChain.call(params);
}
@ -476,6 +514,7 @@ public:
dataSentCallChain.clear();
dataWrittenCallChain.clear();
dataReadCallChain.clear();
sysAttrMissingCallChain.clear();
updatesEnabledCallback = NULL;
updatesDisabledCallback = NULL;
confirmationReceivedCallback = NULL;
@ -491,6 +530,7 @@ private:
DataSentCallbackChain_t dataSentCallChain;
DataWrittenCallbackChain_t dataWrittenCallChain;
DataReadCallbackChain_t dataReadCallChain;
SysAttrMissingCallbackChain_t sysAttrMissingCallChain;
GattServerShutdownCallbackChain_t shutdownCallChain;
EventCallback_t updatesEnabledCallback;
EventCallback_t updatesDisabledCallback;

2
ble/GattServerEvents.h
View file

@ -32,7 +32,7 @@ public:
GATT_EVENT_UPDATES_DISABLED = 4, /**< Notify/Indicate disabled in CCCD. */
GATT_EVENT_CONFIRMATION_RECEIVED = 5, /**< Response received from Indicate message. */
GATT_EVENT_READ_AUTHORIZATION_REQ = 6, /**< Request application to authorize read. */
GATT_EVENT_WRITE_AUTHORIZATION_REQ = 7, /**< Request application to authorize write. */
GATT_EVENT_WRITE_AUTHORIZATION_REQ = 7 /**< Request application to authorize write. */
} gattEvent_t;
};