diff --git a/zephyr/iut_test/include/iut_zephyr.h b/zephyr/iut_test/include/iut_zephyr.h
new file mode 100644
index 0000000..5b35e2b
--- /dev/null
+++ b/zephyr/iut_test/include/iut_zephyr.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* IUT help functions for Zephyr */
+
+#include <zephyr/kernel.h>
+
+#ifndef _IUT_ZEPHYR_H_
+#define _IUT_ZEPHYR_H_
+
+#ifndef CONFIG_SHELL_BACKEND_SERIAL_INTERRUPT_DRIVEN
+void iut_shell_suspend(void);
+void iut_shell_resume(void);
+#else
+static inline void iut_shell_suspend(void)
+{
+}
+
+static inline void iut_shell_resume(void)
+{
+}
+#endif
+
+#endif /* _IUT_ZEPHYR_H_ */
diff --git a/zephyr/iut_test/src/shell_iut.c b/zephyr/iut_test/src/shell_iut.c
index 55a0bc8..6ceec82 100644
--- a/zephyr/iut_test/src/shell_iut.c
+++ b/zephyr/iut_test/src/shell_iut.c
@@ -56,8 +56,11 @@ SHELL_STATIC_SUBCMD_SET_CREATE(sub_iut,
 
 SHELL_CMD_REGISTER(iut, &sub_iut, "IUT commands", NULL);
 
-#ifdef _CONFIG_PM
-static const struct shell_uart *sh_uart;
+
+#ifndef CONFIG_SHELL_BACKEND_SERIAL_INTERRUPT_DRIVEN
+/* The following code could only work when the shell backend is not interrupt-driven. */
+
+static struct shell_uart_polling *sh_uart;
 
 void iut_shell_suspend(void)
 {
@@ -71,7 +74,7 @@ void iut_shell_suspend(void)
 		}
 
 		/*get shell uart backend*/
-		sh_uart = (const struct shell_uart *)shell_ptr->iface->ctx;
+		sh_uart = (struct shell_uart_polling *)shell_ptr->iface->ctx;
 
 		if (sh_uart == NULL) {
 			iut_print("get shell UART pointer error!!!\n");
@@ -79,14 +82,15 @@ void iut_shell_suspend(void)
 		}
 	}
 
-	k_timer_stop(sh_uart->timer);
+	k_timer_stop(&sh_uart->rx_timer);
 }
 
 void iut_shell_resume(void)
 {
 	if (sh_uart) {
-		k_timer_start(sh_uart->timer, K_NO_WAIT,
+		k_timer_start(&sh_uart->rx_timer, K_NO_WAIT,
 			K_MSEC(CONFIG_SHELL_BACKEND_SERIAL_RX_POLL_PERIOD));
 	}
 }
+
 #endif