Hi Folks .. I'm not entirely a newbie a python and twisted, but I have come to the point where I need a bit more expertise on this topic, so I am hoping that I have come to the right place .. What I'm hoping, that you folks can help out with a minor problem that I am having with the twistd reactor class and/or the callLater function I have been using a reactor.callLater function to schedule an event that happens in the reactor to send out a heartbeat type message at regular intervals .. This works great ! However, it appears to me that the self.sendLine(msg) and or the self.transport.write(msg) writing functions are blocked functions waiting for a reactor event to occur at a future scheduled time before acutally flushing out the internal write buffers .. I am currently using the twistd protocol factory to create a custom protocol to communicate between a server and client, which up until now has not been a real concern, but I am trying to improve the preformance and turn around time between the client and server and this blocking operation is a major source of unneeded delay .. My problem is that I have scheduled heartbeat events that I want to send to the server .. as well as the non scheduled events that I want to go to the server imediately .. I have been scouring the various python/twistd document sites, but to no avial, on all of the sites that I have seen, the method used have all done the same thing , by re-scheduling something into the future with a reactor.callLater () function, which causes a delayed write to occur .. not a problem for something that is 1 or 2 second s in the furture, but it is a serious problem when the next event is 120 seconds away .. I have tried using a self.transport.write(msg) function, but the actual communication still seems to be buffered and stuck waiting for the scheduled reactor event .. What I think I need is something similar to self.transport.flush() which would flush out the write buffers on demand, but does not seen to exist .. I am hoping that someone has faced the same/similar stituation and give me some guidance and/or to point me in the correct direction .. Thanks for any help you can offer .. Cheers Dave Watson