Hi, Luiz I am seeing a bluez gatt notification problem in gatt-database.c Here is scenario: 1. Assume server has one characteristic A that is subscribed by client and sending notification, 2. Then ble connection is disconnected by client directly or connection disappear without unsubscribing A. 3. Client tries to connect to ble successfully 4. Client fails to subscribe that characteristic A. 5. Another retry to make Ble connection and subscribe to A can work. It seems ble disconnect does not cleanup notify_io and stop notification in step 3 at code, https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/gatt-database.c It seems retry in step 5 would ccc_write_cb() External CCC write received with value: 0x0000 pipe_hup() 0x921290 closed gatt_ccc_write_cb() CCC write called for handle: 0x0037 -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html