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Groups > comp.lang.python > #61624 > unrolled thread

[newbie] trying socket as a replacement for nc

Started byJean Dubois <jeandubois314@gmail.com>
First post2013-12-11 15:08 -0800
Last post2013-12-13 00:43 +0100
Articles 6 on this page of 46 — 13 participants

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  [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-11 15:08 -0800
    Re: [newbie] trying socket as a replacement for nc Dan Stromberg <drsalists@gmail.com> - 2013-12-11 15:20 -0800
      Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-12 00:28 -0800
        Re: [newbie] trying socket as a replacement for nc Dan Stromberg <drsalists@gmail.com> - 2013-12-12 13:23 -0800
          Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-12 19:23 -0800
            Re: [newbie] trying socket as a replacement for nc Dan Stromberg <drsalists@gmail.com> - 2013-12-12 19:32 -0800
              Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-13 03:03 -0800
              Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-13 03:56 -0800
            Re: [newbie] trying socket as a replacement for nc Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-13 08:35 +0000
              Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-13 04:20 -0800
                Re: [newbie] trying socket as a replacement for nc rusi <rustompmody@gmail.com> - 2013-12-13 09:04 -0800
                Re: [newbie] trying socket as a replacement for nc rusi <rustompmody@gmail.com> - 2013-12-13 09:09 -0800
                  Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-14 05:11 -0800
              Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-14 05:14 -0800
                Re: [newbie] trying socket as a replacement for nc Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-14 13:29 +0000
          Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-16 01:40 -0800
            Re: [newbie] trying socket as a replacement for nc Ervin Hegedüs <airween@gmail.com> - 2013-12-16 11:04 +0100
      Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-12 14:16 +0000
        Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-13 01:23 +1100
        Re: [newbie] trying socket as a replacement for nc Dan Stromberg <drsalists@gmail.com> - 2013-12-12 13:27 -0800
          Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-13 16:06 +0000
            Re: [newbie] trying socket as a replacement for nc Dan Stromberg <drsalists@gmail.com> - 2013-12-14 17:24 -0800
              Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-15 15:15 +0000
                Re: [newbie] trying socket as a replacement for nc Roy Smith <roy@panix.com> - 2013-12-15 10:51 -0500
                  Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-16 03:04 +1100
                    Re: [newbie] trying socket as a replacement for nc Roy Smith <roy@panix.com> - 2013-12-15 12:44 -0500
                  Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-15 22:42 +0000
                    Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-16 09:48 +1100
        Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-13 08:58 +1100
          Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-13 16:10 +0000
            Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-14 03:19 +1100
              Re: [newbie] trying socket as a replacement for nc Grant Edwards <invalid@invalid.invalid> - 2013-12-13 16:57 +0000
                Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-14 04:05 +1100
          Re: [newbie] trying socket as a replacement for nc 88888 Dihedral <dihedral88888@gmail.com> - 2013-12-16 04:38 -0800
            Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-16 23:59 +1100
            Re: [newbie] trying socket as a replacement for nc Roy Smith <roy@panix.com> - 2013-12-16 09:03 -0500
              Re: [newbie] trying socket as a replacement for nc 88888 Dihedral <dihedral88888@gmail.com> - 2013-12-18 23:20 -0800
        Re: [newbie] trying socket as a replacement for nc Dave Angel <davea@davea.name> - 2013-12-12 19:52 -0500
    Re: [newbie] trying socket as a replacement for nc Conor Hughes <conorh@conorh.net> - 2013-12-11 15:38 -0800
      Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-12 00:08 -0800
        Re: [newbie] trying socket as a replacement for nc Chris Angelico <rosuav@gmail.com> - 2013-12-12 19:21 +1100
          Re: [newbie] trying socket as a replacement for nc Jean Dubois <jeandubois314@gmail.com> - 2013-12-12 01:21 -0800
            Re: [newbie] trying socket as a replacement for nc Alister <alister.ware@ntlworld.com> - 2013-12-12 14:05 +0000
            Re: [newbie] trying socket as a replacement for nc Alister <alister.ware@ntlworld.com> - 2013-12-12 14:05 +0000
              Re: [newbie] trying socket as a replacement for nc Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-12 14:34 +0000
    Re: [newbie] trying socket as a replacement for nc Christian Gollwitzer <auriocus@gmx.de> - 2013-12-13 00:43 +0100

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#61679

FromChris Angelico <rosuav@gmail.com>
Date2013-12-12 19:21 +1100
Message-ID<mailman.3970.1386836496.18130.python-list@python.org>
In reply to#61677
On Thu, Dec 12, 2013 at 7:08 PM, Jean Dubois <jeandubois314@gmail.com> wrote:
> Thanks for the reply, I changed the line you mentioned to
> s.send('*IDN?\n')

See if there's a newline issue - you might need \r\n here.

ChrisA

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#61690

FromJean Dubois <jeandubois314@gmail.com>
Date2013-12-12 01:21 -0800
Message-ID<d92123da-f4c1-45a0-ad64-4ec4f881d388@googlegroups.com>
In reply to#61679
On Thursday, December 12, 2013 9:21:32 AM UTC+1, Chris Angelico wrote:
> On Thu, Dec 12, 2013 at 7:08 PM, Jean Dubois <jeandubois314@gmail.com> wrote:
> 
> > Thanks for the reply, I changed the line you mentioned to
> 
> > s.send('*IDN?\n')
> 
> 
> 
> See if there's a newline issue - you might need \r\n here.
> 
> 
> 
> ChrisA

I changed it as you suggested to:

 s.send('*IDN?\r\n')

unfortunately this doesn't change the result, first run give as response:
Received: 
second run makes the program hang and the adapter needs rebooting

kind regards,
jean

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#61712

FromAlister <alister.ware@ntlworld.com>
Date2013-12-12 14:05 +0000
Message-ID<2pjqu.23361$lc4.20507@fx26.am4>
In reply to#61690
On Thu, 12 Dec 2013 01:21:27 -0800, Jean Dubois wrote:

> On Thursday, December 12, 2013 9:21:32 AM UTC+1, Chris Angelico wrote:
>> On Thu, Dec 12, 2013 at 7:08 PM, Jean Dubois <jeandubois314@gmail.com>
>> wrote:
>> 
>> > Thanks for the reply, I changed the line you mentioned to
>> 
>> > s.send('*IDN?\n')
>> 
>> 
>> 
>> See if there's a newline issue - you might need \r\n here.
>> 
>> 
>> 
>> ChrisA
> 
> I changed it as you suggested to:
> 
>  s.send('*IDN?\r\n')
> 
> unfortunately this doesn't change the result, first run give as
> response:
> Received:
> second run makes the program hang and the adapter needs rebooting
> 
> kind regards,
> jean

you probably need to use something like wireshark to see what is actually 
happening and compare it to a good connection in the normal way.




-- 
Save energy:  Drive a smaller shell.

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#61714

FromAlister <alister.ware@ntlworld.com>
Date2013-12-12 14:05 +0000
Message-ID<Aojqu.22$kI.14@fx01.am4>
In reply to#61690
On Thu, 12 Dec 2013 01:21:27 -0800, Jean Dubois wrote:

> On Thursday, December 12, 2013 9:21:32 AM UTC+1, Chris Angelico wrote:
>> On Thu, Dec 12, 2013 at 7:08 PM, Jean Dubois <jeandubois314@gmail.com>
>> wrote:
>> 
>> > Thanks for the reply, I changed the line you mentioned to
>> 
>> > s.send('*IDN?\n')
>> 
>> 
>> 
>> See if there's a newline issue - you might need \r\n here.
>> 
>> 
>> 
>> ChrisA
> 
> I changed it as you suggested to:
> 
>  s.send('*IDN?\r\n')
> 
> unfortunately this doesn't change the result, first run give as
> response:
> Received:
> second run makes the program hang and the adapter needs rebooting
> 
> kind regards,
> jean

you probably need to use something like wireshark to see what is actually 
happening and compare it to a good connection in the normal way.




-- 
Save energy:  Drive a smaller shell.

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#61719

FromMark Lawrence <breamoreboy@yahoo.co.uk>
Date2013-12-12 14:34 +0000
Message-ID<mailman.3994.1386858905.18130.python-list@python.org>
In reply to#61714
On 12/12/2013 14:05, Alister wrote:
>
> you probably need to use something like wireshark to see what is actually
> happening and compare it to a good connection in the normal way.
>

You've sent this twice old chap, you've a configuration issue somewhere 
I'd guess :)

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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#61775

FromChristian Gollwitzer <auriocus@gmx.de>
Date2013-12-13 00:43 +0100
Message-ID<l8dhmv$qk4$1@dont-email.me>
In reply to#61624
Am 12.12.13 00:08, schrieb Jean Dubois:
> I have an ethernet-rs232 adapter which allows me to connect to a measurement instrument by means of netcat on a linux system.
> e.g. entering nc 10.128.59.63 7000
> allows me to enter e.g.
> *IDN?
> after which I get an identification string of the measurement instrument back.
> I thought I could accomplish the same using the python module "socket"
> and tried out the sample program below which doesn't work however:

> import socket
> host = '10.128.59.63'
> port = 7000
> size = 10

The socket library advises to use a small power of two like 1024; 10 
seems very small.

> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> s.connect((host,port))
> s.send('*IDN?')
\n or \r\n is missing, you found this by yourself - look into the device 
manual, which one is correct

> data = s.recv(size)

It may be, that you simply need to wait for some time after the write, 
before you read. And then before the device is ready, you close the 
connection. If this is the case, try waiting a short time in between and 
use socket.sendall() instead of socket.send()

> s.close()

Maybe you need to read twice?

> Can anyone here tell me how to do it properly?

The most proper way is to use asynchronous IO; never done this in python 
before, check this:

http://docs.python.org/2/library/asyncore.html#asyncore-example-basic-http-client

	Christian

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