[pull] master from jquast:master #7
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2.2.0
* bugfix: workaround for Microsoft Telnet client crash on
``SB NEW_ENVIRON SEND``, #24. Server now defers ``DO
NEW_ENVIRON`` until TTYPE cycling identifies the client, skipping it
entirely for MS Telnet (ANSI/VT100).
* bugfix: in handling of LINEMODE FORWARDMASK command bytes.
* bugfix: SLC fingerprinting byte handling.
* bugfix: send IAC GA (Go-Ahead) after prompts when SGA is not negotiated.
Fixes hanging for MUD clients like Mudlet. PTY shell uses a 500ms idle
timer. Use ``--never-send-ga`` to suppress like old behavior.
* performance: with 'smarter' negotiation, default ``connect_maxwait``
reduced from 4.0s to 1.5s.
* performance: both client and server protocol data_received methods
have approximately ~50x throughput improvement in bulk data transfers.
* new: ``Server`` class returned by ``create_server()`` with
``wait_for_client()`` method and ``clients`` property for tracking
connected clients.
* new: ``TelnetWriter.wait_for()`` and ``wait_for_condition()``
methods for waiting on telnet option negotiation state.
* new: ``telnetlib3.sync`` module with blocking (non-asyncio) APIs:
``TelnetConnection`` for clients, ``BlockingTelnetServer`` for servers.
* new: ``pty_shell`` module and demonstrating ``telnetlib3-server --pty-exec`` CLI argument
and related ``--pty-raw`` server CLI option for raw PTY mode, used by most
programs that handle their own terminal I/O.
* new: ``guard_shells`` module with ``--robot-check`` and ``--pty-fork-limit``
CLI arguments for connection limiting and bot detection.
* new: ``fingerprinting`` module for telnet client identification and
capability probing.
* new: ``--send-environ`` client CLI option to control which environment
variables are sent via NEW_ENVIRON. Default no longer includes HOME or
SHELL.
* --connect-timeout, closes #30 * threw in typing fixes, too!
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