Handling the # TODO: Handle failure in the _IRQ_ENCRYPTION_UPDATE event

まず _security_irq と DeviceConnection._connected を追跡し、報告されたステータス値を bluetooth.h および既存の接続イベントとペアリングイベントの処理と比較します。暗号化エラー、切断、接続の欠落、ペアリングイベントについて期待される動作を特定します。各ケースについてアプリケーションが一貫性のある文書化された結果を受け取れば完了です。

I am using the btstack for the PICO_W. We have needed to do significant work to add pairing/encryption support from the BtStack but for the most part I think we have got the basics working. What I need to know is what to do with the aioble objects when errors occur. I have modified the code a little (slowly adding typing as I learn what things are) to look as follows:

pair_status: int = -1
def _security_irq(event: int, data: tuple[int, bool, bool, bool, int, int]):
    global _modified
    global pair_status

    if event == _IRQ_ENCRYPTION_UPDATE:
        pair_status = -1
        # Connection has updated (usually due to pairing).
        conn_handle, encrypted, authenticated, bonded, key_size, status = data
        pair_status = status
        logger.info("LNI: AIOBLE: encryption update") # type: ignore
        if connection := DeviceConnection._connected.get(conn_handle, None):
            logger.info(f'LNI: AIOBLE: Event triggered. Pairing status: {pair_status}') # type: ignore
            connection.encrypted = encrypted
            connection.authenticated = authenticated
            connection.bonded = bonded
            connection.key_size = key_size
            if pair_status == 19: #ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION (in Bt Stack code - not so in MP code)
                del DeviceConnection._connected[conn_handle]  # Signal as disconnected

            # TODO: Handle failure.
            #if encrypted and connection._pair_event:
            connection._pair_event.set()

I am assuming the status values are those defined in the btstack file bluetooth.h such that status value 0x13 is, for example, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION

What I dont know is exactly what to do in each case. Is the del DeviceConnection._connected[conn_handle] sufficient for the ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION case? Should I always set the event if the connection is not None?

What should be done if if connection := DeviceConnection._connected.get(conn_handle, None) gives None?

Are there certain exceptions I should raise to inform the application or do I need to create one?