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-# Migrating from NNG 1.x
-
-There are some incompatibities from NNG 1.x.
-This guide should help in migrating applications to use NNG 2.0.
-
-## Nanomsg Compatibility
-
-Applications using the legacy `libnanomsg` API will have to be updated to native NNG interfaces.
-See the [Migration Guide for libnanomsg](nanomsg.md) for details.
-
-## Transport Specific Functions
-
-Transports have not needed to be registered for a long time now,
-and the functions for doing so have been removed. These functions
-can be simply removed from your application:
-
-- `nng_inproc_register`
-- `nng_ipc_register`
-- `nng_tls_register`
-- `nng_tcp_register`
-- `nng_ws_register`
-- `nng_wss_register`
-- `nng_zt_register`
-
-Additionally, the header files containing these functions have been removed, such as
-`nng/transport/ipc/ipc.h`. Simply remove `#include` references to those files.
-
-(Special exception: The options for ZeroTier are still located in the
-`nng/transport/zerotier/zerotier.h`.)
-
-The `NNG_OPT_WSS_REQUEST_HEADERS` and `NNG_OPT_WSS_RESPONSE_HEADERS` aliases for
-`NNG_OPT_WS_OPT_WS_REQUEST_HEADERS` and `NNG_OPT_WS_RESPONSE_HEADERS` have been removed.
-Just convert any use of them to `NNG_OPT_WS_REQUST_HEADERS` or
-`NNG_OPT_WS_RESPOSNE_HEADERS` as appropriate.
-
-## Option Functions
-
-The previously deprecated `nng_pipe_getopt_xxx` family of functions is removed.
-Applications should use `nng_pipe_get` and related functions instead.
-
-The socket option function families for `nng_getopt` and `nng_setopt` have been removed as well.
-In this case, use the `nng_socket_get` and `nng_socket_set` functions as appropriate.
-
-## Transport Options
-
-A number of transport options can no longer be set on the socket. Instead these
-options must be set on the endpoint (dialer or listener) using the appropriate
-`nng_dialer_set` or `nng_listener_set` option. This likely means that it is necessary
-to allocate and configure the endpoint before attaching it to the socket. This will
-also afford a much more fine-grained level of control over transport options.
-
-## Statistics Use Constified Pointers
-
-A number of the statistics functions take, or return, `const nng_stat *` instead
-of plain `nng_stat *`. The ABI has not changed, but it may be necessary to declare
-certain methods variables `const` to avoid warnings about misuse of `const`.