Document notification retrying

fidesmo / apdu-over-ble

Specification of a protocol to transmit APDU commands and responses over Bluetooth Low Energy

MIT License

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Document notification retrying #13

Open Franzaine opened 5 years ago

Franzaine commented 5 years ago

When a peripheral is notifying the client that the APDU responses are ready it needs to retry the notification until it is received. Certain phones seem to miss the notification and then the transaction fails. A sensible retry mechanism seems to be retry every second in total 5 times.

martinpaljak commented 5 years ago

Things to consider:

use indications (with ACK) rather than notifications (no ACK) for increased reliability
define a recommended retry mechanism for a BLE server implementation, until the response is read (fully)