jkn wrote: > Hi all > This is a little bit OT for this newsgroup, but I intend to use python > for prototyping at least, and I know there are a lot of knowledgeable > people using Python in a Network context here... > > I have a use case of a single 'master' machine which will need to > periodically 'push' data to a variety of 'slave' devices on a small local > subnet, over Ethernet. We are talking perhaps a dozen devices in all with > comms occurring perhaps once very few seconds, to much less often - once > per half an hour, or less. There is probably an upper bound of 64KB or so > of data that is likely to be sent on each occasion. > > Previous similar systems have attempted to do this by maintaining multiple > long-term TCP connections from the master to all the slave devices. The > Master is the server and the slaves periodically check the master to see > what has changed. Although this ... works ..., we have had trouble > maintaining the connection, for reasons ... I am not yet fully aware of. > > We are now considering an alternative approach where the master maintains > a list of slave devices and acts as a client. Each device is a server from > the point of view of data transfer. We would then use a short-lived TCP > connection when data is available; the Master would connect to each slave > which needed the data, send it, and close the connection. > > I should also add that we desire our system to be 'robust' in the face of > situations such as cable unplugging, device power cycles, etc. > > Although this might get round some of our current problems, I can see that > we might end up with new problems to deal with. I am wondering if this > scenario rings bells with anyone, and seeking pointers to what has been > done elsewhere. As I say, I am expecting to prototype it in Python so any > specifics also welcome! > > (suggestions as to a better forum to ask for previous experience also > gratefully received) > > Thanks al lot for any thoughts/suggestions
You said *any* suggestions, so: I know nothing about them, but would a messaging infrastructure like RabbitMQ or ZeroMQ be useful? -- https://mail.python.org/mailman/listinfo/python-list
