On Thursday, December 12, 2013 12:20:36 AM UTC+1, Dan Stromberg wrote: > On Wed, Dec 11, 2013 at 3:08 PM, Jean Dubois <jeandu...@gmail.com> wrote: > > 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: > > > > Sockets reserve the right to split one socket.send() into multiple > socket.recv()'s on the other end of the communication, or to aggregate > multiple socket.send()'s into a single socket.recv() - pretty much any way > the relevant IP stacks and communications equipment feel like for the sake of > performance or reliability. > > > The confusing thing about this is, it won't be done on every transmission - > in fact, it'll probably happen rather seldom unless you're on a heavy loaded > network or have some MTU issues (see Path MTU Discovery, and bear in mind > that paths can change during a TCP session). But writing your code assuming > it will never happen is a bad idea. > > > > For this reason, I wrote http://stromberg.dnsalias.org/~strombrg/bufsock.html > , which abstracts away these complications, and actually makes things pretty > simple. There are examples on the web page. > > > > HTH
Dear Dan, Could you copy paste here the code for your function I have to add to my "program"? thanks in advance jean -- https://mail.python.org/mailman/listinfo/python-list
