ConnectionInfo

@classmethod
def from_connack(
    cls,
    connect_packet: Connect,
    connack: ConnAck,
    *,
    version: Literal["3.1.1", "5.0"],
    connection_id: int,
) -> Self:
    """Build a snapshot from a successful CONNECT/CONNACK exchange."""
    properties = connack.properties
    client_id = connect_packet.client_id
    keepalive = connect_packet.keepalive
    expiry = None
    if version == "5.0":
        expiry = 0
        if connect_packet.properties is not None and connect_packet.properties.session_expiry_interval is not None:
            expiry = connect_packet.properties.session_expiry_interval
    if properties is not None:
        if not client_id and properties.assigned_client_identifier is not None:
            client_id = properties.assigned_client_identifier
        if properties.server_keep_alive is not None:
            keepalive = properties.server_keep_alive
        if version == "5.0" and properties.session_expiry_interval is not None:
            expiry = properties.session_expiry_interval
    return cls(
        connection_id=connection_id,
        session_present=connack.session_present,
        return_code=connack.return_code,
        properties=properties,
        effective_client_id=client_id,
        effective_keepalive=keepalive,
        effective_session_expiry_interval=expiry,
    )