[Expectperl-discuss] Help with Ill-behaved Device Output

[Ivan t. P. <ru...@ve...>]

I'm using Expect to configure an ill-behaved network device and having
problems.
The device has the characteristic that is sends out 'lines' consisting of
'\n', or '\r\n' and nothing else.
This causes problems as '^$' will not match the later and will match
'nothing' which does not consume any of the input that's been accumulated.  
I used clear_accum when before() or after() matched the patterns in
question, but that does not seem to cause the accumulator to acquire more
content (and the expect times out).  I also tried something crude like
set_accum(' ') when either of the undesirable patterns matched, just so
something ended up in the accumulator.  (I was hoping to 'prime the pump'
and force another read for more input from the device.)  The device timed
out.  I even tried matching '^.*?\r(.*)$' and '^(?:.*?\r)?(.*)$' combined
with set_accum($1), but all that does is turn '\r\n' into '\n' which then
fails as I can't use '^$' to match.

Has anyone run into this 'empty line' problem before?
How did you work around it?
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