--- lbbs/src/bbs_net.c	2025/10/20 01:55:50	1.71
+++ lbbs/src/bbs_net.c	2025/11/05 01:04:06	1.78
@@ -1,18 +1,10 @@
-/***************************************************************************
-						  bbs_net.c  -  description
-							 -------------------
-	Copyright            : (C) 2004-2025 by Leaflet
-	Email                : leaflet@leafok.com
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 3 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * bbs_net
+ *   - user interactive feature of site shuttle
+ *
+ * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
+ */
 
 #include "bbs.h"
 #include "common.h"
@@ -56,9 +48,9 @@ struct _bbsnet_conf
 	char charset[20];
 } bbsnet_conf[MAXSTATION];
 
-MENU_SET bbsnet_menu;
+static MENU_SET bbsnet_menu;
 
-int load_bbsnet_conf(const char *file_config)
+static int load_bbsnet_conf(const char *file_config)
 {
 	FILE *fp;
 	MENU *p_menu;
@@ -153,7 +145,7 @@ int load_bbsnet_conf(const char *file_co
 	return 0;
 }
 
-void unload_bbsnet_conf(void)
+static void unload_bbsnet_conf(void)
 {
 	bbsnet_menu.menu_count = 0;
 	bbsnet_menu.menu_item_count = 0;
@@ -164,7 +156,7 @@ void unload_bbsnet_conf(void)
 	bbsnet_menu.p_menu_item_pool = NULL;
 }
 
-void process_bar(int n, int len)
+static void process_bar(int n, int len)
 {
 	char buf[LINE_BUFFER_LEN];
 	char buf2[LINE_BUFFER_LEN];
@@ -185,14 +177,14 @@ void process_bar(int n, int len)
 	moveto(4, 0);
 	prints(" ------------------------------ \r\n");
 	snprintf(buf, sizeof(buf), "            %3d%%              ", n * 100 / len);
-	strncpy(buf2, buf, (size_t)n);
+	memcpy(buf2, buf, (size_t)n);
 	buf2[n] = '\0';
 	prints("|\033[46m%s\033[44m%s\033[m|\r\n", buf2, buf + n);
 	prints(" ------------------------------ \r\n");
 	iflush();
 }
 
-int bbsnet_connect(int n)
+static int bbsnet_connect(int n)
 {
 	int sock, ret, loop, error;
 	int sock_connected = 0;
@@ -484,7 +476,7 @@ int bbsnet_connect(int n)
 		}
 		else if (nfds == 0) // timeout
 		{
-			if (time(NULL) - BBS_last_access_tm >= MAX_DELAY_TIME)
+			if (time(NULL) - BBS_last_access_tm >= BBS_max_user_idle_time)
 			{
 				break;
 			}
@@ -536,6 +528,11 @@ int bbsnet_connect(int n)
 					}
 					else if (ret == 0)
 					{
+						// Send NO-OP to remote server
+						input_buf[input_buf_len] = '\0';
+						input_buf_len++;
+						BBS_last_access_tm = time(NULL);
+
 						stdin_read_wait = 0;
 						break; // Check whether channel is still open
 					}
@@ -591,12 +588,28 @@ int bbsnet_connect(int n)
 		{
 			if (input_buf_offset < input_buf_len)
 			{
+				// For debug
+#ifdef _DEBUG
+				for (int j = input_buf_offset; j < input_buf_len; j++)
+				{
+					log_error("Debug input: <--[%u]\n", (input_buf[j] + 256) % 256);
+				}
+#endif
+
 				ret = io_buf_conv(input_cd, input_buf, &input_buf_len, &input_buf_offset, input_conv, sizeof(input_conv), &input_conv_len);
 				if (ret < 0)
 				{
 					log_error("io_buf_conv(input, %d, %d, %d) error\n", input_buf_len, input_buf_offset, input_conv_len);
 					input_buf_len = input_buf_offset; // Discard invalid sequence
 				}
+
+				// For debug
+#ifdef _DEBUG
+				for (int j = input_conv_offset; j < input_conv_len; j++)
+				{
+					log_error("Debug input_conv: <--[%u]\n", (input_conv[j] + 256) % 256);
+				}
+#endif
 			}
 
 			while (input_conv_offset < input_conv_len && !SYS_server_exit)
@@ -781,11 +794,12 @@ cleanup:
 			   tm_used->tm_mday - 1, tm_used->tm_hour, tm_used->tm_min,
 			   tm_used->tm_sec);
 
+	BBS_last_access_tm = time(NULL);
+
 	return 0;
 }
 
-static int
-bbsnet_refresh()
+static int bbsnet_refresh()
 {
 	clearscr();
 	moveto(1, 0);
@@ -809,7 +823,7 @@ bbsnet_refresh()
 	return 0;
 }
 
-int bbsnet_selchange()
+static int bbsnet_selchange()
 {
 	int i = bbsnet_menu.menu_item_pos[0];
 
@@ -834,7 +848,7 @@ int bbsnet_selchange()
 	return 0;
 }
 
-int bbs_net()
+extern int bbs_net()
 {
 	int ch, i;
 
@@ -860,7 +874,7 @@ int bbs_net()
 			log_error("KEY_NULL\n");
 			goto cleanup;
 		case KEY_TIMEOUT:
-			if (time(NULL) - BBS_last_access_tm >= MAX_DELAY_TIME)
+			if (time(NULL) - BBS_last_access_tm >= BBS_max_user_idle_time)
 			{
 				log_error("User input timeout\n");
 				goto cleanup;