diff --git a/examples/stm32/Core/Src/main.c b/examples/stm32/Core/Src/main.c
index bb88f94..1e9c66b 100644
--- a/examples/stm32/Core/Src/main.c
+++ b/examples/stm32/Core/Src/main.c
@@ -31,7 +31,8 @@
 
 /* Private define ------------------------------------------------------------*/
 /* USER CODE BEGIN PD */
-
+#define TEST_SERVER 1
+#define TEST_CLIENT 0
 /* USER CODE END PD */
 
 /* Private macro -------------------------------------------------------------*/
@@ -101,7 +102,15 @@ int main(void)
   MX_USART1_UART_Init();
   /* USER CODE BEGIN 2 */
 
+#if TEST_SERVER
   nmbs_server_init(&nmbs, &nmbs_server);
+#endif
+
+#if TEST_CLIENT
+  uint8_t coils_test[32];
+  uint16_t regs_test[32];
+  nmbs_client_init(&nmbs);
+#endif
 
   /* USER CODE END 2 */
 
@@ -114,7 +123,19 @@ int main(void)
     /* USER CODE BEGIN 3 */
 
     // If you use rtos, this polling can processed in a task
+    #if TEST_SERVER
     nmbs_server_poll(&nmbs);
+    #endif
+
+    #if TEST_CLIENT
+    nmbs_set_destination_rtu_address(&nmbs, 0x01);
+    nmbs_error status = nmbs_read_holding_registers(&nmbs, 0, 32, regs_test);
+    status = nmbs_write_multiple_registers(&nmbs, 0, 32, regs_test);
+    if(status != NMBS_ERROR_NONE)
+    {
+      while(true){}
+    }
+    #endif
   }
   /* USER CODE END 3 */
 }
diff --git a/examples/stm32/nanomodbus_port.c b/examples/stm32/nanomodbus_port.c
index d855f33..4b37a2b 100644
--- a/examples/stm32/nanomodbus_port.c
+++ b/examples/stm32/nanomodbus_port.c
@@ -66,6 +66,31 @@ nmbs_error nmbs_server_init(nmbs_t* nmbs, nmbs_server_t* _server)
     return NMBS_ERROR_NONE;
 }
 
+nmbs_error nmbs_client_init(nmbs_t* nmbs)
+{
+    ringbuf_init(&rb, ringbuf_overflow_error);
+
+    nmbs_platform_conf conf;
+
+    nmbs_platform_conf_create(&conf);
+    conf.transport = NMBS_TRANSPORT_RTU; 
+    conf.read = read_serial;   
+    conf.write = write_serial;
+
+    nmbs_error status = nmbs_client_create(nmbs, &conf);
+    if(status != NMBS_ERROR_NONE)
+    {
+        return status;
+    }
+    
+    nmbs_set_byte_timeout(nmbs, 100);
+    nmbs_set_read_timeout(nmbs, 1000);
+
+    HAL_UARTEx_ReceiveToIdle_DMA(&NANOMB_UART, rx_dma_buf, RX_BUF_SIZE);
+    return NMBS_ERROR_NONE;
+}
+
+
 static nmbs_server_t* get_server(uint8_t id)
 {
     if(id == server->id)
diff --git a/examples/stm32/nanomodbus_port.h b/examples/stm32/nanomodbus_port.h
index eda24a0..83bd957 100644
--- a/examples/stm32/nanomodbus_port.h
+++ b/examples/stm32/nanomodbus_port.h
@@ -26,6 +26,7 @@ typedef struct tNmbsServer{
 }nmbs_server_t;
 
 nmbs_error nmbs_server_init(nmbs_t* nmbs, nmbs_server_t* server);
+nmbs_error nmbs_client_init(nmbs_t* nmbs);
 
 extern UART_HandleTypeDef NANOMB_UART;