https://devzone.nordicsemi.com/f/nordic-q-a/51508/how-can-i-know-how-many-queued-packets-i-loose-on-disconnection-when-connected-to-multiple-peripheralsHi, I&#180;m using nrf52840 with softdevice S132, SDK version 15.2 as ble central. I&#180;m using the write_cmt_tx_queue by setting ble_gattc_conn_cfg_t::write_cmd_tx_queue_size to larger than 1, and counting queued writes by increasing a counter when receivingen-USTelligent Community 13Tue, 03 Sep 2019 12:27:32 GMThttps://devzone.nordicsemi.com/thread/207680?ContentTypeID=1Tue, 03 Sep 2019 12:27:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dd6aa7d8-42cd-4c99-9106-19acd5cd8ba2mk2<p>I see, thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/206638?ContentTypeID=1Wed, 28 Aug 2019 13:16:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4bd57f57-ea41-4998-a823-2ff893d85d85Kenneth<p>Hi,</p> <p>Not really no (even ideal best case there would be an inaccuracy of 1 packet since the peer might always have receive a packet that is not ack&#39;ed yet on the link layer). I would instead consider using ack on the application layer, for instance send 10 packets (by regular write or notification), wait for a packet (by write or notification) in reverse direction, before transmitting the next 10 packets and so on. Upon (re-)connection you can always <span>inquire how many packets have been received and continue from there.</span></p> <p><span>Best regards,<br />Kenneth</span></p><div style="clear:both;"></div>