Merge pull request ARMmbed#14506 from noonfom/value-handle

Add GattUpdatesEnabledCallbackParams struct

Author: 0xc0170

connectivity/FEATURE_BLE/include/ble/gatt/GattCallbackParamTypes.h

@@ -443,9 +443,33 @@ struct GattDataSentCallbackParams {
 
 };
 
-using GattUpdatesEnabledCallbackParams        = GattDataSentCallbackParams;
-using GattUpdatesDisabledCallbackParams       = GattDataSentCallbackParams;
-using GattConfirmationReceivedCallbackParams  = GattDataSentCallbackParams;
+/**
+ * Gatt Updates Changed Attribute related events
+ *
+ * Used by `onUpdatesEnabled` and 'onUpdatesDisabled'
+ */
+struct GattUpdatesChangedCallbackParams {
+
+    /**
+     * The handle of the connection that triggered the event.
+     */
+    ble::connection_handle_t connHandle;
+
+    /**
+     * The handle of the CCCD producing the event
+     */
+    GattAttribute::Handle_t attHandle;
+
+    /**
+     * The value handle of the characteristic containing the CCCD  
+     */
+    GattAttribute::Handle_t charHandle;
+    
+};
+
+using GattUpdatesEnabledCallbackParams       = GattUpdatesChangedCallbackParams;
+using GattUpdatesDisabledCallbackParams      = GattUpdatesChangedCallbackParams;
+using GattConfirmationReceivedCallbackParams = GattDataSentCallbackParams;
 
 namespace ble {
 

connectivity/FEATURE_BLE/source/cordio/source/GattServerImpl.cpp

@@ -1542,6 +1542,15 @@ bool GattServer::get_cccd_index_by_value_handle(GattAttribute::Handle_t char_han
     return false;
 }
 
+bool GattServer::get_value_handle_by_cccd_handle(GattAttribute::Handle_t cccd_handle, GattAttribute::Handle_t &char_handle) const {
+    uint8_t idx;
+    if (!get_cccd_index_by_cccd_handle(cccd_handle, idx)) {
+        return false;
+    }
+    char_handle = cccd_handles[idx];
+    return true;
+}
+
 bool GattServer::is_update_authorized(
     connection_handle_t connection,
     GattAttribute::Handle_t value_handle
@@ -1720,13 +1729,18 @@ void GattServer::handleEvent(
     GattAttribute::Handle_t attributeHandle
 )
 {
+    // To be used in cases where the characteristic value handle differs from the attribute handle
+    GattAttribute::Handle_t charHandle;
+
     switch (type) {
         case GattServerEvents::GATT_EVENT_UPDATES_ENABLED:
             tr_info("Updates enabled for attribute %d on connection %d", attributeHandle, connHandle);
+            MBED_ASSERT(get_value_handle_by_cccd_handle(attributeHandle, charHandle));
             if(eventHandler) {
                 GattUpdatesEnabledCallbackParams params({
                     .connHandle = connHandle,
-                    .attHandle = attributeHandle
+                    .attHandle = attributeHandle,
+                    .charHandle = charHandle
                 });
                 eventHandler->onUpdatesEnabled(params);
             }
@@ -1738,10 +1752,12 @@ void GattServer::handleEvent(
             break;
         case GattServerEvents::GATT_EVENT_UPDATES_DISABLED:
             tr_info("Updates disabled for attribute %d on connection %d", attributeHandle, connHandle);
+            MBED_ASSERT(get_value_handle_by_cccd_handle(attributeHandle, charHandle));
             if(eventHandler) {
                 GattUpdatesDisabledCallbackParams params({
                     .connHandle = connHandle,
-                    .attHandle = attributeHandle
+                    .attHandle = attributeHandle,
+                    .charHandle = charHandle
                 });
                 eventHandler->onUpdatesDisabled(params);
             }

connectivity/FEATURE_BLE/source/cordio/source/GattServerImpl.h

@@ -293,6 +293,8 @@ class GattServer : public PalSigningMonitor {
 
     bool get_cccd_index_by_value_handle(GattAttribute::Handle_t char_handle, uint8_t &idx) const;
 
+    bool get_value_handle_by_cccd_handle(GattAttribute::Handle_t cccd_handle, GattAttribute::Handle_t &char_handle) const;
+
     bool is_update_authorized(connection_handle_t connection, GattAttribute::Handle_t value_handle);
 
     struct alloc_block_t {