Some unknown errors

[vstadnytskyi]

I would randomly get this error:

Ignoring late response with ioid=1 regarding PV named BEAMLINE:m39.VAL because it arrived 11.781 seconds after the deadline specified by the timeout.

or this

Server failed to process command: EventAddRequest(data_type=<ChannelType.TIME_ENUM: 17>, data_count=0, sid=33, subscriptionid=67, low=0.0, high=
0.0, to=0.0, mask=5)
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_data.py", line 367, in subscribe
    metadata, values = self._content[data_type]
KeyError: <ChannelType.TIME_ENUM: 17>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 114, in enum_to_int
    return enum_strings.index(v)
ValueError: tuple.index(x): x not in tuple

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 325, in convert_values
    enum_strings=enum_strings)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 123, in _preprocess_enum_values
    return [enum_to_int(v) for v in values]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 123, in <listcomp>
    return [enum_to_int(v) for v in values]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 116, in enum_to_int
    raise CaprotoConversionError(f'Invalid enum string: {v!r}')
caproto._utils.CaprotoConversionError: Invalid enum string: ''

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/server/common.py", line 182, in _command_queue_ite
ration
    response = await self._process_command(command)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/server/common.py", line 533, in _process_command
    sub)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_data.py", line 371, in subscribe
    metadata, values = await self._read(data_type)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_data.py", line 410, in _read
    direction=ConversionDirection.TO_WIRE)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/caproto/_backend.py", line 327, in convert_values
    raise CaprotoConversionError() from ex
caproto._utils.CaprotoConversionError

[danielballan]

I think we might have fixed this in https://caproto.github.io/caproto/release-notes.html#v0-5-0-2020-05-01. Still an issue?