diff --git a/main/main.c b/main/main.c
index f6a9eb9..b770382 100755
--- a/main/main.c
+++ b/main/main.c
@@ -46,14 +46,14 @@ void app_main(void)
     esp_chip_info_t chip_info;
     uint32_t        flash_size;
     esp_chip_info(&chip_info);
-    // printf("This is %s chip with %d CPU core(s), %s%s%s%s, ", CONFIG_IDF_TARGET,
-    //        chip_info.cores,
-    //        (chip_info.features & CHIP_FEATURE_WIFI_BGN) ? "WiFi/" : "",
-    //        (chip_info.features & CHIP_FEATURE_BT) ? "BT" : "",
-    //        (chip_info.features & CHIP_FEATURE_BLE) ? "BLE" : "",
-    //        (chip_info.features & CHIP_FEATURE_IEEE802154)
-    //            ? ", 802.15.4 (Zigbee/Thread)"
-    //            : "");
+    printf("This is %s chip with %d CPU core(s), %s%s%s%s, ", CONFIG_IDF_TARGET,
+           chip_info.cores,
+           (chip_info.features & CHIP_FEATURE_WIFI_BGN) ? "WiFi/" : "",
+           (chip_info.features & CHIP_FEATURE_BT) ? "BT" : "",
+           (chip_info.features & CHIP_FEATURE_BLE) ? "BLE" : "",
+           (chip_info.features & CHIP_FEATURE_IEEE802154)
+               ? ", 802.15.4 (Zigbee/Thread)"
+               : "");
 
     unsigned major_rev = chip_info.revision / 100;
     unsigned minor_rev = chip_info.revision % 100;
@@ -72,11 +72,13 @@ void app_main(void)
 
     // for (int i = 10; i >= 0; i--) {
     //     printf("Restarting in %d seconds...\n", i);
-        // vTaskDelay(1000 / portTICK_PERIOD_MS);
+    // vTaskDelay(1000 / portTICK_PERIOD_MS);
     // }
     cdc_printf("start run app:\r\n");
+
     xTaskCreate(imp_main_app_task, "main", 2048, NULL, 10, NULL);
-    while(1) {
+
+    while (1) {
         // cdc_printf("start run app:\r\n");
         vTaskDelay(1000 / portTICK_PERIOD_MS);
     }
@@ -85,3 +87,20 @@ void app_main(void)
     fflush(stdout);
     esp_restart();
 }
+
+static void _show_build_time(int argc, char** argv)
+{
+    cdc_printf("build at %s %s\n", __DATE__, __TIME__);
+}
+
+static uint8_t imp_restart_esp()
+{
+    cdc_printf("Restarting now.\n");
+    vTaskDelay(10);
+    esp_restart();
+}
+
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN),
+                 reboot, imp_restart_esp, restart esp);
+SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN),
+                 show_build_time, _show_build_time, show the build time);