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_error.py
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_error.py
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# Copyright (c) 2019 OpenCyphal
# This software is distributed under the terms of the MIT License.
# Author: Pavel Kirienko <pavel@opencyphal.org>
import pycyphal.transport
class PortClosedError(pycyphal.transport.ResourceClosedError):
"""
Raised when an attempt is made to use a presentation-layer session instance that has been closed.
Observe that it is a specialization of the corresponding transport-layer error type.
Double-close is NOT an error, so closing the same instance twice will not result in this exception being raised.
"""
class RequestTransferIDVariabilityExhaustedError(pycyphal.transport.TransportError):
"""
Raised when an attempt is made to invoke more concurrent requests that supported by the transport layer.
For CAN, the number is 32; for some transports the number is unlimited (technically, there is always a limit,
but for some transports, such as the serial transport, it is unreachable in practice).
"""