diff --git a/platform/os/freertos/HAL_Timer_freertos.c b/platform/os/freertos/HAL_Timer_freertos.c
index 326ca63..9263c93 100644
--- a/platform/os/freertos/HAL_Timer_freertos.c
+++ b/platform/os/freertos/HAL_Timer_freertos.c
@@ -27,13 +27,13 @@ bool HAL_Timer_Expired(Timer *timer) {
     return timer->end_time < now;
 }
 
-void HAL_Timer_Countdown_ms(Timer *timer, unsigned int timeout_ms) {
+void HAL_Timer_Countdown_ms(Timer *timer, uint32_t timeout_ms) {
     TickType_t now;
     now = xTaskGetTickCount();
     timer->end_time = now + (timeout_ms / portTICK_RATE_MS);
 }
 
-void HAL_Timer_Countdown(Timer *timer, unsigned int timeout) {
+void HAL_Timer_Countdown(Timer *timer, uint32_t timeout) {
     TickType_t now;
     now = xTaskGetTickCount();
     timer->end_time = now + (timeout * 1000 / portTICK_RATE_MS);
diff --git a/platform/os/linux/HAL_Timer_linux.c b/platform/os/linux/HAL_Timer_linux.c
index 0119329..61aaf12 100644
--- a/platform/os/linux/HAL_Timer_linux.c
+++ b/platform/os/linux/HAL_Timer_linux.c
@@ -29,7 +29,7 @@ bool HAL_Timer_Expired(Timer *timer) {
     return res.tv_sec < 0 || (res.tv_sec == 0 && res.tv_usec <= 0);
 }
 
-void HAL_Timer_Countdown_ms(Timer *timer, unsigned int timeout_ms) {
+void HAL_Timer_Countdown_ms(Timer *timer, uint32_t timeout_ms) {
     struct timeval now;
     gettimeofday(&now, NULL);
 #ifdef __cplusplus
@@ -40,7 +40,7 @@ void HAL_Timer_Countdown_ms(Timer *timer, unsigned int timeout_ms) {
     timeradd(&now, &interval, &timer->end_time);
 }
 
-void HAL_Timer_Countdown(Timer *timer, unsigned int timeout) {
+void HAL_Timer_Countdown(Timer *timer, uint32_t timeout) {
     struct timeval now;
     gettimeofday(&now, NULL);
     struct timeval interval = {timeout, 0};
diff --git a/src/mqtt/src/mqtt_client_common.c b/src/mqtt/src/mqtt_client_common.c
index 52897a7..d14eb22 100644
--- a/src/mqtt/src/mqtt_client_common.c
+++ b/src/mqtt/src/mqtt_client_common.c
@@ -1272,7 +1272,6 @@ int cycle_for_read(UIoT_Client *pClient, Timer *timer, uint8_t *packet_type, QoS
              * Should not happen */
              
             return ERR_MQTT_RX_MESSAGE_PACKET_TYPE_INVALID;
-            break;
         }
     }
 
diff --git a/src/sdk-impl/uiot_export.h b/src/sdk-impl/uiot_export.h
index a228198..4c5634c 100644
--- a/src/sdk-impl/uiot_export.h
+++ b/src/sdk-impl/uiot_export.h
@@ -20,9 +20,6 @@
 extern "C" {
 #endif
 
-/* IoT C-SDK version info */
-#define UIOT_DEVICE_SDK_VERSION                                     "1.0.0"
-
 /* MQTT心跳消息发送周期, 单位:s */
 #define UIOT_MQTT_KEEP_ALIVE_INTERNAL                               (240)