on-the-wire format should be portable

[sehe]

Currently the on-the-wire format is endianness agnositc.

Meaning, we don't know what byte ordering is used to represent multi-byte entities (like integers).

This is fine as long as we don't want to communicate between processes on different machines/architectures/...

Changing this is in principle a brealing change that creates a new wire-format version. If we know who our users are, we could try to make the preferred wire format the same as it was in the majority of use-cases.

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Implementation note: I'd suggest using the corresponding types from Boost Endian

    using wire_u16 = boost::endian::big_uint16_t;

    struct headers_t {
        wire_u16	topiclen;
        wire_u16	bodylen;
        action		msgaction;
        wire_u16	magic;
    };