Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

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util:sexyz [2020/12/05 11:57] – [Credits] SMBLIB not part of SEXYZ any longer digital manutil:sexyz [2023/12/22 12:16] (current) – [Overview] clarify native means 32-bit or 64-bit digital man
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 ===== Overview ===== ===== Overview =====
  
-SEXYZ was developed as a native (32-bit) TCP/socket-based replacement for the+SEXYZ was developed as a native (32-bit or 64-bit) TCP/socket-based replacement for the
 16-bit DOS file transfer drivers (e.g. FDSZ, CE-XYZ, etc.) that we've been 16-bit DOS file transfer drivers (e.g. FDSZ, CE-XYZ, etc.) that we've been
 stuck with on 32-bit BBSes for FAR too long. stuck with on 32-bit BBSes for FAR too long.
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 <code ini> <code ini>
 Telnet=TRUE                 ; set to FALSE to change the default mode Telnet=TRUE                 ; set to FALSE to change the default mode
-TCP_NoDelay=TRUE            ; disable the TCP Nagle algorithm 
 LogLevel=INFO               ; set display/log output level LogLevel=INFO               ; set display/log output level
 +SysLog=FALSE                ; log to syslog (*nix only)
 Debug=FALSE                 ; enable debug logging (overrides LogLevel) Debug=FALSE                 ; enable debug logging (overrides LogLevel)
 DebugTx=FALSE               ; debug transmitted characters DebugTx=FALSE               ; debug transmitted characters
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 OutbufDrainTimeout=10       ; milliseconds before auto-flush OutbufDrainTimeout=10       ; milliseconds before auto-flush
 ProgressInterval=1          ; interval (in seconds) of progress display ProgressInterval=1          ; interval (in seconds) of progress display
-MaxFileSize=0               ; maximum receive file size in bytes (0=unlimited)   +MaxFileSize=0               ; maximum receive file size in bytes (0=unlimited)
    
 [XMODEM] [XMODEM]
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 MaxBlockSize=1024   ; 1024 is "true" ZMODEM, 8192 for ZMODEM-8K (ZedZap) MaxBlockSize=1024   ; 1024 is "true" ZMODEM, 8192 for ZMODEM-8K (ZedZap)
 MaxErrors=9         ; maximum number of consecutive errors MaxErrors=9         ; maximum number of consecutive errors
-RecvBufSize=0       ; specify non-zero for partial streaming receives +RecvBufSize=0       ; specify non-zero for segmented receives 
-Streaming=TRUE      ; set to FALSE to disable streaming (block-at-a-time)+Streaming=TRUE      ; set to FALSE to disable streaming (segmented receives)
 CRC32=TRUE          ; set to FALSE to force CRC-16 instead CRC32=TRUE          ; set to FALSE to force CRC-16 instead
 +FullDuplex=TRUE     ; set to FALSE to disable window support (on receive)
 EscapeTelnetIAC=TRUE    ; send ZDLE/ZRUB1 instead of 0xff with -telnet EscapeTelnetIAC=TRUE    ; send ZDLE/ZRUB1 instead of 0xff with -telnet
 Escape8thBit=FALSE      ; ZDLE-escape all bytes with bit-7 set Escape8thBit=FALSE      ; ZDLE-escape all bytes with bit-7 set
 EscapeCtrlChars=FALSE   ; ZDLE-escape all control characters (< 20h) EscapeCtrlChars=FALSE   ; ZDLE-escape all control characters (< 20h)
 +MaxWindowSize=0         ; Set to non-zero number of bytes to use window management
 +TargetWindowSize=0      ; Set to a duration (e.g. in seconds) to enable auto-adjusting window size
  
 [DSZLOG] [DSZLOG]
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 Short=false         ; use Micros~1 short path/filename in log (Windows) Short=false         ; use Micros~1 short path/filename in log (Windows)
 Quotes=false        ; enclose filename in "quotes" (for EleBBS) Quotes=false        ; enclose filename in "quotes" (for EleBBS)
 +
 +[SOCKOPTS]
 </code> </code>
  
-**Note:**\\ +**Notes:**\\ 
-Older versions of SEXYZ did not support comments on some of the ''sexy.ini'' lines shown above.+  * The defaults and ''sexyz.ini'' specified values can be over-ridden via command-line options. 
 +  * Older versions of SEXYZ did not support comments on some of the ''sexy.ini'' lines shown above. 
 +  * See ''[[dir:ctrl]]/[[config:sockopts.ini]]'' for the Socket Options that can be set in the ''[SOCKOPTS]'' section. 
 +  * Versions of SEXYZ prior to 3.0 recognized a global ''TCP_NODELAY'' key. Now that key, if it is to be set, must be in the optional ''[SOCKOPTS]'' section (for advanced uses only).
  
 ===== Compatibility ===== ===== Compatibility =====
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   * Failed: none   * Failed: none
  
 +
 +===== ZMODEM Streaming =====
 +The ZMODEM protocol supports multiple methods of data streaming and error recovery. SEXYZ supports the following ZMODEM streaming modes, in order of decreasing successful data transfer assurance:
 +
 +  * **Segmented**: a "block at a time" mode, each data subpacket acknowledged by the receiver (whom can request this mode). Can be enabled when sending via the ''-s'' option or by setting ''Streaming=false'' in ''sexyz.ini''.
 +  * **Window Management**: limiting the amount of data "in-flight" between the sender and receiver using asynchronous status reporting by the receiver. Can be controlled when sending via the ''-w'' option or by setting ''MaxWindowSize'' (and optionally ''TargetWindowSize'') in ''sexyz.ini''.
 +  * **Full Streaming**: the default, subject to large send-buffering on the sending side potentially resulting in failed error-recovery or completion-acknowledgment timeouts.
 +
 +//Window Management// mode was added in SEXYZ v3.0 to support very asymmetric send-operations where the sender is a modern system, potentially with multiple-megabyte send-buffers, sending to a receiver that can only consume data at a rate of 115200bps (about 10KBytes/second) or less.
  
 ===== Support ===== ===== Support =====

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