https://devzone.nordicsemi.com/f/nordic-q-a/64950/notification-packet-loss-ios-androidFrom my understanding, notifications have guaranteed in-order delivery at the lower levels. I&#39;m working on a small file transfer system out of an nrf52840, trying to decide if I can design the protocol for a lossless system. Is it possible for the BLEen-USTelligent Community 13Wed, 19 Aug 2020 12:53:23 GMThttps://devzone.nordicsemi.com/thread/265328?ContentTypeID=1Wed, 19 Aug 2020 12:53:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef3c1b0a-bd12-4711-9cac-7436d68cb309Aleksander Nowakowski<p>Hello,</p> <p>So far we didn&#39;t have problems with this. On Android, the value of a characteristic is a shared resource for writing and reading/notifications, so make sure you don&#39;t reuse the same characteristic for writing and getting values. Otherwise you may receive what you have just send. Also, try to avoid setting another handler in connectGatt. All notifications will be received on the BLE handler without another delay/copying to your thread. On iOS there seem to be no issues.</p><div style="clear:both;"></div>