Hello, koandrew, you wrote: SK>> Here, in my opinion, the question costs so - if it is individual need 1-3 copies I would not become and did by hinged mounting on the adapters marked above. And if it is a least series 10 + that will do already intelligently the high-grade device. K> a problem that these decisions are absolutely nonequivalent. While the decision on COTTON VELVET allows to reach speeds, comparable with speed of a network (as slowest link), in your decision it is so much time delays and potential that I even find it difficult to tell straight off that there will be the slowest link. Certainly, making of the decision, it is necessary to weigh all pluses and minuses of each variant. K> at least, one problem sees that is SPI Master, that is the date transmission direction will be reverse "" to a control flow that forces it permanently to interrogate port (or to hang on interruption), Most likely you are right. But, well and let hangs. That does not hinder to write SPI slave using not SPI and GPIo the interface. I doubt that turns out more slowly SPI. K> plus the fact of presence of OS in it also very negatively affects latency (to the decision on OS COTTON VELVET it is not necessary absolutely). Here from "that side" in a network who is not known, it is not known as, will be host/server AoE. How concerns that that host will be occupied (than that important) and another does not answer ten packets? At there is a gigabyte , for caching of network operations. K> that is the offered system of crutches at least on orders is worse than the normal decision. Yes.