Server traceback when reading a float about caproto

[kc64]

In verbose mode, I get this:

caproto-get -v A:CHILLER1:FLOW_RATE
[D 13:54:18.013       client:   59] Registering with the Channel Access repeater.
[D 13:54:18.014       client:   74] Searching for 'A:CHILLER1:FLOW_RATE'....
[D 13:54:18.015       client:  144] Found 'A:CHILLER1:FLOW_RATE' at 10.10.11.24:5064
[D 13:54:18.031       client:  198] 10.10.11.60:52565 <<<--- 10.10.11.24:5064 16B VersionResponse(version=13)
[D 13:54:18.072       client:  198] 10.10.11.60:52565 <<<--- 10.10.11.24:5064 16B AccessRightsResponse(cid=0, access_rights=<AccessRights.WRITE|READ: 3>)
[D 13:54:18.073       client:  198] 10.10.11.60:52565 <<<--- 10.10.11.24:5064 16B CreateChanResponse(data_type=<ChannelType.DOUBLE: 6>, data_count=1, cid=0, sid=0)
[I 13:54:18.073       client:  202] A:CHILLER1:FLOW_RATE Channel connected.
[D 13:54:18.073       client:  215] 10.10.11.24:5064 A:CHILLER1:FLOW_RATE Detected native data_type <ChannelType.DOUBLE: 6>.
[D 13:54:18.077       client:  239] 10.10.11.60:52565 <<<--- 10.10.11.24:5064 88B A:CHILLER1:FLOW_RATE ErrorResponse(original_request=MessageHeader(command=15, payload_size=0, data_type=6, data_count=0, parameter1=0, parameter2=0), cid=0, status=CAStatusCode(name='ECA_INTERNAL', code=17, code_with_severity=142, severity=<CASeverity.FATAL: 6>, success=0, defunct=False, description='Channel Access Internal Failure'), error_message=bytearray(b'Python exception: TypeError len() of unsized object\x00\x00\x00\x00\x00'))
Traceback (most recent call last):
  File "C:\python_v3.10.0\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\python_v3.10.0\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "c:\My Software\pype_dream2\.local\Scripts\caproto-get.exe\__main__.py", line 7, in <module>
  File "c:\My Software\pype_dream2\.local\lib\site-packages\caproto\commandline\get.py", line 172, in main
    response = read(pv_name=pv_name,
  File "c:\My Software\pype_dream2\.local\lib\site-packages\caproto\sync\client.py", line 353, in read
    return _read(chan, timeout, data_type=data_type, data_count=data_count,
  File "c:\My Software\pype_dream2\.local\lib\site-packages\caproto\sync\client.py", line 244, in _read
    raise ErrorResponseReceived(command)
caproto._utils.ErrorResponseReceived: ErrorResponse(original_request=MessageHeader(command=15, payload_size=0, data_type=6, data_count=0, parameter1=0, parameter2=0), cid=0, status=CAStatusCode(name='ECA_INTERNAL', code=17, code_with_severity=142, severity=<CASeverity.FATAL: 6>, success=0, defunct=False, description='Channel Access Internal Failure'), error_message=bytearray(b'Python exception: TypeError len() of unsized object\x00\x00\x00\x00\x00'))

[edited to fix markup]

[tacaswell]

Comparing to e.g.

caproto/caproto/ioc_examples/simple.py

Lines 20 to 23 in 46020e4

	A = pvproperty(
	value=1,
	doc='An integer',
	)

I would expect that to work.

Can you share a minimal copy-pasteable example of an IOC that shows this problem?

[kc64]

We just discovered the issue. The data was being pushed into the pvdb as '2.3' (a string) instead of 2.3 (a float). Embarrassing but a relief. Thanks for trying to help.