clarify on window size

[komuw]

window size, ie how many requests can be pending before they are responded to.

as far as I know, the SMPP spec does not mandate anyone(client or server), to put a cap on the max number of un-responded requests they can allow.

[komuw]

since naz responds to requests from SMSC as soon as it gets them, I do not foresee naz getting into situations where it is lagging behind any SMSC that happens to have window size limits.

if naz ever finds itself in such a situation; then it is probably because it has some perfomance bottlenecks(say for example if naz is waiting for a network request etc).
if that were to be the case; we should fix those perfomance bugs

[komuw]

I'm going to defer on this until such a bug is actually reported.