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This fixes two problems with the BTstack implementation of descriptor discovery: - The call to gatt_client_discover_characteristic_descriptors needs to have value_handle set to the starting handle (actually characteristic handle) to start the search from. - The BTstack event for a descriptor query result is GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT. With this change the test tests/multi_bluetooth/ble_subscribe.py now passes when BTstack is instance1 (for BTstack to pass as instance0 requires gatts_write to support sending an update on BTstack). Signed-off-by: Damien George <damien@micropython.org>