Finished to implement the millis api? It uses the FreeRTOS tick hook function to keep track of running time.

src/W800_SDK_v1.00.10/app/app_utils/app_utils.c

@@ -3,6 +3,12 @@
 
 static uint32_t _elapsed_ms = 0;
 
+void vApplicationTickHook(void)
+{
+    /* One tick is 2 ms because configTICK_RATE_HZ = 500. */
+    _elapsed_ms += 2;
+}
+
 void us_delay(uint32_t us)
 {
     struct tls_timer_cfg timer_config = 
@@ -55,6 +61,11 @@ void ms_delay(uint32_t ms)
     tls_timer_destroy(timer_id);
 }
 
+void ms_increment(uint32_t increment)
+{
+    _elapsed_ms += increment;
+}
+
 uint32_t elapsed_ms(void)
 {
     return _elapsed_ms;

src/W800_SDK_v1.00.10/app/app_utils/app_utils.h

@@ -18,7 +18,14 @@ void us_delay(uint32_t us);
 void ms_delay(uint32_t ms);
 
 /**
- * @brief Returns the current milli seconds count elapsed since the start of the program. 
+ * @brief Manually increment the millisecond counter.
+ * 
+ * @param increment amount of milliseconds to add to the current @ref elapsed_ms count. 
+ */
+void ms_increment(uint32_t increment);
+
+/**
+ * @brief Returns the current milliseconds count elapsed since the start of the program. 
  * 
  * @return uint32_t the elapsed time in ms
  */