> On May 28, 2015, at 6:17 PM, Dan Stromberg <drsali...@gmail.com> wrote: > > 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. > > 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. > > HTH. > > On Wed, May 27, 2015 at 4:30 AM, Garrone, Corrado
While that’s certainly possible in a routed network (and even then can be overridden with the “do not fragment” bit), it won’t 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.garr...@roche.com> wrote: >> Dear Python Team, >> >> 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? >> >> If you got any queries, please do not hesitate to contact me. >> >> Thank you very much for your efforts. >> >> Kind regards, >> >> Corrado Garrone >> DH-Student Fachrichtung Elektrotechnik / Co-op Student B.Eng. Electrical >> Engineering >> >> Roche Diagnostics GmbH >> DFGHMV8Y6164 >> Sandhofer Strasse 116 >> 68305 Mannheim / Germany >> >> Phone: apprentice >> mailto:corrado.garr...@roche.com >> >> Roche Diagnostics GmbH >> Sandhofer Straße 116; D‑68305 Mannheim; Telefon +49‑621‑759‑0; Telefax >> +49‑621‑759‑2890 >> Sitz der Gesellschaft: Mannheim - Registergericht: AG Mannheim HRB 3962 - >> Geschäftsführung: Dr. Ursula Redeker, Sprecherin; Edgar Vieth - >> Aufsichtsratsvorsitzender: Dr. Severin Schwan >> >> 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 >> unauthorized use of the information contained in this message is prohibited. >> >> >> -- >> https://mail.python.org/mailman/listinfo/python-list >> > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
