Hm, IIUC can't the remote script sleep-loop and send output
back asynchronously. (More reseach needed on async piece)..
$ssh->system('/path/to/remote_script arg, arg,...');
#!/bin/...
# remote_script
for (...); do get_temp_probe(); ..... ; sleep 300; done
On Tue, Apr 18, 2017 at 6:19 PM, lee <l...@yagibdah.de> wrote:
>
> Hi,
>
> I'm trying to repeatedly execute a command on a remote machine and
> to capture the output with a perl program.
>
> I have tried Net::OpenSSH and Net::SSH::Perl. Both log in, execute the
> command, capture the output --- and then log out. According to the log
> file of the remote machine, Net::OpenSSH logs out by closing the
> connection after running the command once despite being designed
> otherwise. Net::OpenSSH is designed to log out after each command.
>
>
> Since I want to execute the command repeatedly (over long periods of
> time in intervals of maybe 300 seconds), I do not want to close the
> connection to the remote machine until my perl program is finished.
>
> How could this be achieved?
>
>
> The purpose is to get room temperature readings which are stored in a
> table in a mysql database. I haven't found any device at a reasonable
> price that would reliably provide such readings.
>
> Using lmsensors works, but the readings are too much influenced by the
> temperature of the server. I have a switch that provides pretty stable
> temperature readings which I might be able to use instead, and to get
> those, I have to log in to the switch and issue a command that shows its
> temperature.
>
> Hence I don't want to log in and out all the time just to get a
> temperature reading.
>
>
> Suggestions for reliably getting a room temperature reading are also
> welcome. I do not want to use the serial port because I sometimes need
> it to connect to a console port on a switch or router, and there's only
> one serial port. I could use the parallel port or usb, though.
>
> I'm not really inclined to solder some sort of diy thingy myself as I'd
> probably overheat the parts and do more damage than anything else; it's
> just not my thing doing that kind of stuff.
>
> If anything fails, I could get away by hooking up a simple thermostat
> which opens and closes a contact depending on temperature, as long as I
> can get a reading whether the contact is opened or closed. It won't be
> a good solution, yet better than nothing.
>
> I'm aware that there are USB sticks ("temper") that /might/ work, but
> from what I've been reading, they seem rather unreliable even if you can
> get one to work.
>
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