[newbie] trying socket as a replacement for nc

[Jean Dubois]

Op maandag 16 december 2013 15:16:17 UTC+1 schreef Jean-Michel Pichavant:
> ----- Original Message -----
> > Op maandag 16 december 2013 13:05:41 UTC+1 schreef Jean-Michel
> > Pichavant:
> > > > Here is the code:
> > > > #!/usr/bin/env python
> > > > import telnetlib
> > > > host = '10.128.59.63'
> > > > port = 7000
> > > > t = Telnet(host, port)
> > > > t.write('*IDN?\n')
> > > > print t.read_until('Whateverprompt')
> > > > # you can use read_very_eager also
> > > > 
> > > > and this is the result of executing the code(from which I deduce
> > > > I
> > > > have to
> > > > install telnetlib, but how?)
> > > > Traceback (most recent call last):
> > > >   File "./nctelnet.py", line 5, in <module>
> > > >     t = Telnet(host, port)
> > > > NameError: name 'Telnet' is not defined
> > > > 
> > > > kind regards,
> > > > jean
> > > t = telnetlib.Telnet(host, port)
> > this helps, but I don't know what to do with
> > "print t.read_until('Whateverprompt')"
> > 
> > should I send CTRL-ALT-ALTGR-] after some time?
> > 
> > kind regards,
> > jean
> one way to approach the problem is to first make some monkey tests.
> 1/ connect to your equipment using telnet (from the linux shell)
> 2/ try typing some commands like *IDN?
> 3/ see how the equipment is answering
> 4/ you need to identify what is the prompt, and what EndOfLine sequence is used.
> 5/ then in a python shell, try to reproduce the behavior:
>   import telnetlib
>   t = telnetlib.Telnet(host, port)
>   t.read_very_eager() #flush
>   t.write('\n')
>   prompt = t.read_very_eager() #this is one way to get the prompt
>   print repr(prompt) #you may identify the EOL sequence with this one
> When you get a good feeling about how it works, write the code.
Running you code I get as response:
''


This is what I got using telnet:
[jean:~] $ telnet 10.128.59.63 7000
Trying 10.128.59.63...
Connected to 10.128.59.63.
Escape character is '^]'.
*IDN?
KEITHLEY INSTRUMENTS INC.,MODEL 2425,1078209,C32   Oct  4 2010
14:20:11/A02  /E/                                                         
                                                                 H

after pressing CTRL-ALT-ALTGR-] I get this:
^[^]
after which I get the telnet-prompt
>telnet
and I can quit telnet by entering quit


kind regards,
jean