Hello, I am running BlueZ 5.37 on Linux kernel 4.1.6 with an Atheros AR3012 adapter configured to advertise a service using the experimental D-Bus GATT API on a Freescale i.MX6 Quad (ARMv7l). The advertising is working fine (verified this via Nordic’s Android App 'nRF Master Control Panel‘). Connecting and discovering services/characteristics is also working without any issues. One of the characteristics has the property "flags" set to ["write-without-response“, "notify“]. Centrals should write their data quickly without the need to wait for a response (accepting the potential data loss) and get value changes only via notification. Explicit read is not supported. When a central sends multiple writes of 1-20 bytes in a row, only the first write succeeds. Any following writes fail in src/shared/gatt-server.c:786. As a result of this, only a few writes happen to be sent as a signal on the D-Bus. As an experiment I replaced the lines 786-789 with these: if (server->pending_write_op) { op = server->pending_write_op; } else { op = new0(struct async_write_op, 1); op->server = server; op->opcode = opcode; server->pending_write_op = op; } My intention is to make use of the pending writes queue, used in gatt-db.c::gatt_db_attribute_write(). Running the bluetoothd with the modified code as described above, all writes result in signals on the D-Bus. Due to my very limited knowledge of the BlueZ code, I kindly ask you to explain the reason behind current gatt-server::write_cb() behavior in this case. Note: - The same GATT service configuration works fine using Apple CoreBluetooth (no matter if iOS or OS X), therefore I assume a misusage on my side of the BlueZ D-Bus API. - Running a guest VM on a host Intel Core i7 does not show any issues. Using a ARMv7 machine (Freescale i.MX6 Quad) result in BT_ATT_ERROR_UNLIKELY as described. Thank you in advance! Best regards, Sven-- 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