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Subject: Re: Accessing DataSocket Server with Python
From: William Ray Wing <wrw@mac.com>
In-reply-to: <CAGGBd_pEf0E6skDgzVuWLsPEX73OvpTkQ=CwgjKF6Yz+fC6bsw@mail.gmail.com>
Date: Fri, 29 May 2015 09:37:15 -0400
Cc: python-list@python.org, "William R. Wing" <wrw@mac.com>
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To: Dan Stromberg <drsalists@gmail.com>
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> On May 28, 2015, at 6:17 PM, Dan Stromberg <drsalists@gmail.com> =
wrote:
>=20
> I have no idea about the protocol used by NI DataSockets, but you
> might be able to reverse engineer the protocol by using the official
> client with a sniffer.
>=20
> Also, be aware that TCP/IP guarantees that you get the correct data in
> the correct order, but it doesn't guarantee anything about the sizes
> of the chunks in which that data arrives.  So you could send 100
> bytes, 100 bytes, 100 bytes, but on the other end receive 100 bytes,
> 50 bytes, 75 bytes, 75 bytes.  When you catenate them all together,
> it's still the same data though.
>=20
> HTH.
>=20
> On Wed, May 27, 2015 at 4:30 AM, Garrone, Corrado

While that=E2=80=99s certainly possible in a routed network (and even =
then can be overridden with the =E2=80=9Cdo not fragment=E2=80=9D bit), =
it won=E2=80=99t happen in a LAN or self-contained instrument set-up.  =
These days, even routed networks tend to deliver anything less than a =
1500 byte packet as a single entity.  With fiber backbones and =
high-speed LANs, it is more work for a router to fragment a packet then =
to simply pass it on.  The days of 480 byte packets pretty much went =
away with dial-up modems.

Bill



> <corrado.garrone@roche.com> wrote:
>> Dear Python Team,
>>=20
>> currently I am working on a research project for my bachelor degree. =
A
>> LabVIEW application is used for current and power measurements, =
whereas the
>> measured data are sent to DataSocket Server, a technology by National
>> Instruments used for data exchange between computers and =
applications.
>> DataSocket is based on TCP/IP and thus requesting data from =
DataSocket
>> should be similar to an internet request.
>> I know with the socket library in Python it is possible with to =
establish
>> sockets, send internet requests and communicate between clients and =
servers.
>> Is there a possibility to access NI DataSocket and get measurement =
data with
>> Python on the same computer where Python is installed and the codes =
are
>> executed? Can you maybe send me an example code where such a =
connection with
>> DataSocket is established?
>>=20
>> If you got any queries, please do not hesitate to contact me.
>>=20
>> Thank you very much for your efforts.
>>=20
>> Kind regards,
>>=20
>> Corrado Garrone
>> DH-Student Fachrichtung Elektrotechnik / Co-op Student B.Eng. =
Electrical
>> Engineering
>>=20
>> Roche Diagnostics GmbH
>> DFGHMV8Y6164
>> Sandhofer Strasse 116
>> 68305 Mannheim / Germany
>>=20
>> Phone: apprentice
>> mailto:corrado.garrone@roche.com
>>=20
>> Roche Diagnostics GmbH
>> Sandhofer Stra=C3=9Fe 116; D=E2=80=9168305 Mannheim; Telefon =
+49=E2=80=91621=E2=80=91759=E2=80=910; Telefax
>> +49=E2=80=91621=E2=80=91759=E2=80=912890
>> Sitz der Gesellschaft: Mannheim - Registergericht: AG Mannheim HRB =
3962 -
>> Gesch=C3=A4ftsf=C3=BChrung: Dr. Ursula Redeker, Sprecherin; Edgar =
Vieth -
>> Aufsichtsratsvorsitzender: Dr. Severin Schwan
>>=20
>> Confidentiality Note
>> This message is intended only for the use of the named recipient(s) =
and may
>> contain confidential and/or privileged information. If you are not =
the
>> intended recipient, please contact the sender and delete the message. =
Any
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prohibited.
>>=20
>>=20
>> --
>> https://mail.python.org/mailman/listinfo/python-list
>>=20
> --=20
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