Add reboot command and late terminal activation

src/system_console.c

@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+/* Root-level system lifecycle commands for the physical administration console. */
+
+#include "system_console.h"
+
+#include <stdio.h>
+
+#include "esp_console.h"
+#include "esp_system.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+static int command_reboot(int argc, char **argv)
+{
+    (void)argv;
+    if (argc != 1) {
+        printf("Usage: reboot\n");
+        return 1;
+    }
+
+    printf("Rebooting now; unsaved RAM-only configuration changes will be lost.\n");
+    fflush(stdout);
+    /* Give the UART driver time to transmit the acknowledgement before reset. */
+    vTaskDelay(pdMS_TO_TICKS(100U));
+    esp_restart();
+    return 0;
+}
+
+esp_err_t system_console_register_commands(void)
+{
+    const esp_console_cmd_t command = {
+        .command = "reboot",
+        .help = "Restart the ESP32; unsaved RAM-only configuration is lost",
+        .hint = NULL,
+        .func = &command_reboot,
+        .argtable = NULL,
+    };
+    return esp_console_cmd_register(&command);
+}