Fixes BLE Server descriptor update (espressif#6919)

Description of Change

This PR fixes an issue related to BLE Server and Descriptors.

The issue:
If the BLE Server code changes its own descriptors, it is not reflected in the GATTS database.
BLE2902 CCCD also didn't reflect any changes to the GATTS database.
Because of this issue, the client could never read the real Descriptor values from the remote Server.

Tests scenarios

Tested with ESP32.

Related links

Fixes espressif#6863
Fixes espressif#6868

Author: SuGlider

libraries/BLE/src/BLE2902.cpp

@@ -46,6 +46,7 @@ void BLE2902::setIndications(bool flag) {
 	uint8_t *pValue = getValue();
 	if (flag) pValue[0] |= 1 << 1;
 	else pValue[0] &= ~(1 << 1);
+	setValue(pValue, 2);
 } // setIndications
 
 
@@ -57,6 +58,7 @@ void BLE2902::setNotifications(bool flag) {
 	uint8_t *pValue = getValue();
 	if (flag) pValue[0] |= 1 << 0;
 	else pValue[0] &= ~(1 << 0);
+	setValue(pValue, 2);
 } // setNotifications
 
 #endif

libraries/BLE/src/BLEDescriptor.cpp

@@ -32,7 +32,7 @@ BLEDescriptor::BLEDescriptor(const char* uuid, uint16_t len) : BLEDescriptor(BLE
 BLEDescriptor::BLEDescriptor(BLEUUID uuid, uint16_t max_len) {
 	m_bleUUID            = uuid;
 	m_value.attr_len     = 0;                                         // Initial length is 0.
-	m_value.attr_max_len = max_len;                     // Maximum length of the data.
+	m_value.attr_max_len = max_len;                     			  // Maximum length of the data.
 	m_handle             = NULL_HANDLE;                               // Handle is initially unknown.
 	m_pCharacteristic    = nullptr;                                   // No initial characteristic.
 	m_pCallback          = nullptr;                                   // No initial callback.
@@ -235,6 +235,10 @@ void BLEDescriptor::setValue(uint8_t* data, size_t length) {
 	}
 	m_value.attr_len = length;
 	memcpy(m_value.attr_value, data, length);
+	if (m_handle != NULL_HANDLE) {
+		esp_ble_gatts_set_attr_value(m_handle, length, (const uint8_t *)data);
+		log_d("Set the value in the GATTS database using handle 0x%x", m_handle);
+	}
 } // setValue
 
 

libraries/BLE/src/BLEDescriptor.h

@@ -51,7 +51,7 @@ class BLEDescriptor {
 	uint16_t                m_handle;
 	BLEDescriptorCallbacks* m_pCallback;
 	BLECharacteristic*      m_pCharacteristic;
-	esp_gatt_perm_t				  m_permissions = ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE;
+	esp_gatt_perm_t         m_permissions = ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE;
 	FreeRTOS::Semaphore     m_semaphoreCreateEvt = FreeRTOS::Semaphore("CreateEvt");
 	esp_attr_value_t        m_value;