imho, Capnproto is too heavy even for successor, dual core ESP32
i can suggest use more lightweight binary flat-serialization protocol, or 
don't invent bicycle and use JSON (with RapidJSON library) + JSONRPC 2.0. 
and as transport trivial http+WebSocket is enough.

четверг, 5 октября 2017 г., 22:06:45 UTC+3 пользователь David Ondrušek 
написал:
>
> Hi Kenton,
>
> I'm developing an IoT device using the ESP8266 wifi-enabled 
> microcontroller. When connected to wifi it has 48kB free RAM.
> Cap'n'proto is useful for my project since message building/reading is a 
> static process. So it's easy to check if there is enough free memory to 
> process the message. That's important because while modern microcontroller 
> toolchains do compile C++ code. C++ exceptions aren't really supported.
>
> What i'm unsure about is if i should also port over the two party RPC 
> implementation. It would make communication a lot easier. But i don't know 
> if that's even feasible given the low memory available.
>

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