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All messages, request and response, except handshake, start with unsigned integerint message length (excluding the length itself).

• Any MsgPack unsigned integer int type can be used , so that shorter messages use smaller type to encode length(see varint above). Empty message will be single 0 byte.
• Maximum message length is 2147483647 (Integer.MAX_VALUE and maximum byte array length in Java)

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Clients should expect notification messages at any moment after the successful handshake.

Operation codes and request ids are omitted everywhere below for brevity.

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