Add reboot command and late terminal activation

src/console_completion.c

@@ -5,6 +5,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "esp_console.h"
 #include "linenoise/linenoise.h"
@@ -109,6 +110,22 @@ static const char *const s_completion_candidates[] = {
     "wifi traceroute",
 };
 
+static ssize_t console_read_with_late_terminal_upgrade(int file_descriptor,
+                                                       void *buffer,
+                                                       size_t size)
+{
+    ssize_t received = read(file_descriptor, buffer, size);
+    if (received > 0 && linenoiseIsDumbMode()) {
+        /*
+         * The current line remains in the safe dumb reader. The next call to
+         * linenoise() starts enhanced mode only after a terminal has proven it
+         * can send data, so its cursor-position query cannot block unattended.
+         */
+        linenoiseSetDumbMode(0);
+    }
+    return received;
+}
+
 static void console_completion_callback(const char *buffer, linenoiseCompletions *completions)
 {
     /* Preserve ESP-IDF completion for registered root command names. */
@@ -134,5 +151,7 @@ static void console_completion_callback(const char *buffer, linenoiseCompletions
 
 void console_completion_install(void)
 {
+    /* Preserve ESP-IDF's safe boot-time mode until actual UART input arrives. */
+    linenoiseSetReadFunction(&console_read_with_late_terminal_upgrade);
     linenoiseSetCompletionCallback(&console_completion_callback);
 }