nx_rpc.nx

nx_rpc.nx -- typed RPC over nx_net_chan_blob. Builds on nx_net_chan_blob's variable-length frames to give a request/response pattern: caller sends (method_id, request_blob), server dispatches to a registered handler indexed by method_id, returns (response_blob). Wire format per exchange: client -> server: 8 bytes: method_id (i64 big-endian via nx_net_chan_send) N bytes: request blob (length-prefix framed via nx_net_chan_send_blob) server -> client: N bytes: response blob (length-prefix framed) Sentinel method_id NX_RPC_SHUTDOWN signals server to exit cleanly. Handler table: a fixed-size array indexed by method_id. Each entry is a typed fn-ptr: func(*u8, n_req, *u8, max_resp) -> n_resp. Unregistered methods get a -1 response. Composes against: [[nx_net_chan_tcp_i64]] (method_id transport), [[nx_net_chan_blob_framing]] (request/response payload), [[fn_ptr_indirect_call]] (typed dispatch).