Implement long polling for terminal data to reduce server load

wssshd2/html_pages/terminal_page.h

@@ -486,7 +486,7 @@ static const char *terminal_page_html =
 "            }\n"
 "            // Schedule next poll\n"
 "            if (pollInterval) {\n"
-"                pollInterval = setTimeout(pollData, 100);\n"
+"                pollInterval = setTimeout(pollData, 300);\n"
 "            }\n"
 "        }\n"
 "    })\n"
@@ -494,7 +494,7 @@ static const char *terminal_page_html =
 "        console.error('Polling error:', error);\n"
 "        // Continue polling even on error\n"
 "        if (pollInterval) {\n"
-"            pollInterval = setTimeout(pollData, 100);\n"
+"            pollInterval = setTimeout(pollData, 300);\n"
 "        }\n"
 "    });\n"
 "}\n"

wssshd2/image_data.h

@@ -8,7 +8,7 @@ unsigned char image_jpg[] = {
   0x70, 0x9c, 0xba, 0x51, 0x3c, 0x00, 0x00, 0x00, 0x06, 0x62, 0x4b, 0x47,
   0x44, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0xa0, 0xbd, 0xa7, 0x93, 0x00,
   0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 0x45, 0x07, 0xe9, 0x09, 0x16, 0x0f,
-  0x29, 0x29, 0x88, 0x55, 0xca, 0x62, 0x00, 0x00, 0x05, 0xd4, 0x7a, 0x54,
+  0x2d, 0x23, 0x0c, 0xec, 0xe6, 0x78, 0x00, 0x00, 0x05, 0xd4, 0x7a, 0x54,
   0x58, 0x74, 0x52, 0x61, 0x77, 0x20, 0x70, 0x72, 0x6f, 0x66, 0x69, 0x6c,
   0x65, 0x20, 0x74, 0x79, 0x70, 0x65, 0x20, 0x61, 0x70, 0x70, 0x31, 0x00,
   0x00, 0x48, 0x89, 0x85, 0x96, 0x59, 0x92, 0xdc, 0x38, 0x10, 0x43, 0xff,

wssshd2/templates/terminal.html

@@ -460,9 +460,9 @@ function pollData() {
                     term.write(data);
                 }
             }
-            // Schedule next poll
+            // Schedule next poll immediately for long polling
             if (pollInterval) {
-                pollInterval = setTimeout(pollData, 300);
+                pollInterval = setTimeout(pollData, 0);
             }
         }
     })
@@ -470,7 +470,7 @@ function pollData() {
         console.error('Polling error:', error);
         // Continue polling even on error
         if (pollInterval) {
-            pollInterval = setTimeout(pollData, 300);
+            pollInterval = setTimeout(pollData, 0);
         }
     });
 }

wssshd2/web.c

@@ -1332,6 +1332,14 @@ static void handle_request(int client_fd, const http_request_t *req) {
                                 session_ended = true;
                             } else {
                                 output = terminal_get_output(active_terminals[i], &output_len);
+                                // Long polling: if no data, wait up to 5 seconds for data
+                                if (output_len == 0) {
+                                    for (int wait = 0; wait < 5; wait++) {
+                                        sleep(1);
+                                        output = terminal_get_output(active_terminals[i], &output_len);
+                                        if (output_len > 0) break;
+                                    }
+                                }
                             }
                             break;
                         }