we send a relatively large stream of data (~160 kb) from peripherals via GATT notifications, multiple times per hour. occasionally (about once an hour per peripheral) we loose sync of our protocol between the central and peripheral. this seems to happen only in a system with lower performance (iMX7d). we traced this to some GATT notifications that don't reach the application level, these are visible in `btmon`. we're using BlueZ 5.50 (also tried to apply patches since the release due to required bug fixes). it happens both with with start_notitfy and acquire_notify. we have another implementation of this transfer that is less stressful and streams 256 kb chunks with a pause for sending a command in the other direction for the next chunk and it has no issues. we also have an older implementation of the central application that uses HCI sockets and not bluetoothd/d-bus, which also has no issues. is it possible that in some occasions bluetoothd will skip notifications? how do I even start to debug/fix it ?
