Am 09.06.2013 10:42, schrieb foster:
> Present is deprecated in actual version of owfs.
>
I doubt it will ever go away or change its semantics.
> Anyway I don't understand why I couldn't check if path exist. The whole
> problem is that if I remove ibutton, directory in owfs disappear,
>
Because the onewire is slow, owfs will not issue any command on the bus
if it can be avoided. You'll have to read a property of the chip from
the "uncached" directory to trigger actual bus action. Because the
ID-iButtons don't have a property, you'll have to check "present" for
these chips. Owfs will issue a "Match ROM" command for the chip then.
> but python still answer that directory exists.
>
That is because it *exists*. This is not limited to python or any other
binding to owfs
$ ls /tmp/ow/uncached/
81.9E982F000000 bus.0 settings statistics structure system
Connect 01.34F196150000
$ ls /tmp/ow/uncached/
01.34F196150000 81.9E982F000000 bus.0 settings statistics structure
system
Disconnect 01.34F196150000
$ ls /tmp/ow/uncached/01.34F196150000
address alias crc8 family id locator r_address r_id r_locator type
$ ls /tmp/ow/uncached/01.34F196150000/id
/tmp/ow/uncached/01.34F196150000/id
After a while, owfs will forget about these disconnected chips. This can
be tuned by the --timeout_presence option. This may be ok for simpler
applications, for a large network I'd still go for "present".
Kind regards
Jan
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