Introduce 'gattlib_characteristic_free_value()' to release memory allocated after reading GATT characteristic

dbus/gattlib_char.c

@@ -439,3 +439,7 @@ int gattlib_write_without_response_char_by_handle(gatt_connection_t* connection,
 	g_object_unref(dbus_characteristic.gatt);
 	return ret;
 }
+
+void gattlib_characteristic_free_value(void *ptr) {
+	free(ptr);
+}

examples/gatttool/gatttool.c

@@ -266,7 +266,7 @@ static gboolean characteristics_read(gpointer user_data)
 			}
 			g_print("\n");
 
-			free(buffer);
+			gattlib_characteristic_free_value(buffer);
 			return TRUE;
 		}
 	}

examples/read_write/read_write.c

@@ -107,7 +107,7 @@ int main(int argc, char *argv[]) {
 		}
 		printf("\n");
 
-		free(buffer);
+		gattlib_characteristic_free_value(buffer);
 	} else {
 		ret = gattlib_write_char_by_uuid(connection, &g_uuid, &value_data, sizeof(value_data));
 		if (ret != GATTLIB_SUCCESS) {

examples/read_write_memory/read_write_memory.c

@@ -83,7 +83,7 @@ void *connect_ble(void *arg) {
 			}
 			printf("\n");
 
-			free(buffer);
+			gattlib_characteristic_free_value(buffer);
 		}
 	} else {
 		ret = gattlib_write_char_by_uuid(connection, &m_uuid, &params->value_data, sizeof(params->value_data));

gattlib-py/gattlib/__init__.py

@@ -116,6 +116,10 @@ gattlib_discover_char.argtypes = [c_void_p, POINTER(POINTER(GattlibCharacteristi
 gattlib_read_char_by_uuid = gattlib.gattlib_read_char_by_uuid
 gattlib_read_char_by_uuid.argtypes = [c_void_p, POINTER(GattlibUuid), POINTER(c_void_p), POINTER(c_size_t)]
 
+# void gattlib_characteristic_free_value(void* buffer);
+gattlib_characteristic_free_value = gattlib.gattlib_characteristic_free_value
+gattlib_characteristic_free_value.argtypes = [c_void_p]
+
 # int gattlib_write_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, const void* buffer, size_t buffer_len)
 gattlib_write_char_by_uuid = gattlib.gattlib_write_char_by_uuid
 gattlib_write_char_by_uuid.argtypes = [c_void_p, POINTER(GattlibUuid), c_void_p, c_size_t]

gattlib-py/gattlib/gatt.py

@@ -87,6 +87,7 @@ class GattCharacteristic():
             for i in range(_buffer_len.value):
                 value[i] = c_bytearray.contents[i]
 
+            gattlib_characteristic_free_value(_buffer)
             return value
 
     def write(self, data, without_response=False):

include/gattlib.h

@@ -464,6 +464,13 @@ int gattlib_read_char_by_uuid(gatt_connection_t* connection, uuid_t* uuid, void*
  */
 int gattlib_read_char_by_uuid_async(gatt_connection_t* connection, uuid_t* uuid, gatt_read_cb_t gatt_read_cb);
 
+/**
+ * @brief Free buffer allocated by the characteristic reading to store the value
+ *
+ * @param buffer Buffer to free
+ */
+void gattlib_characteristic_free_value(void *ptr);
+
 /**
  * @brief Function to write to the GATT characteristic UUID
  *