diff --git a/cube/User/Src/networkAbstractionLayer_lan.c b/cube/User/Src/networkAbstractionLayer_lan.c
index d82ddd6..cc55d56 100644
--- a/cube/User/Src/networkAbstractionLayer_lan.c
+++ b/cube/User/Src/networkAbstractionLayer_lan.c
@@ -17,39 +17,66 @@ static uint8_t sntpBuffer[MAX_SNTP_BUF_SIZE];
 static const uint64_t UNIX_NTP_EPOCH_DIFF = 2208988800;
 extern const uint8_t SNTP_SOCK;
 static uint64_t seconds;
+static enum {
+    SNTP_STATE_IDLE,
+    SNTP_STATE_SEND,
+    SNTP_STATE_DONE,
+    SNTP_STATE_ERROR
+} sntpState = SNTP_STATE_IDLE;
+
 
 void networkSntpEngine(void *handle) {
     if (isNetworkAvailable()) {
-        coloredMsg(LOG_BLUE, "wizsq, about to call SNTP");
+        switch (sntpState) {
+        case SNTP_STATE_SEND:
+            coloredMsg(LOG_BLUE, "nes, about to call SNTP");
 
-        uint8_t ntpServer[4];
-        if (wizDnsQuery(config->ntpServer, ntpServer)) {
-            SNTP_init(SNTP_SOCK, ntpServer, 0, sntpBuffer);
-            uint16_t cycles = 0;
-            uint32_t startTime = HAL_GetTick();
-            while (1) {
-                cycles += 1;
-                datetime curTime;
-                if (1 == SNTP_run(&curTime)) {
-                    seconds = curTime.seconds - UNIX_NTP_EPOCH_DIFF;
-                    coloredMsg(LOG_BLUE, "wizsq, cycles: %u, curTime: %lu", cycles, seconds);
-                    uint32_t stopTime = HAL_GetTick();
-                    coloredMsg(LOG_BLUE, "wizsq, duration: %u ms", stopTime - startTime);
-                    break;
+            uint8_t ntpServer[4];
+            if (wizDnsQuery(config->ntpServer, ntpServer)) {
+                SNTP_init(SNTP_SOCK, ntpServer, 0, sntpBuffer);
+                uint16_t cycles = 0;
+                uint32_t startTime = HAL_GetTick();
+                while (1) {
+                    cycles += 1;
+                    datetime curTime;
+                    if (1 == SNTP_run(&curTime)) {
+                        seconds = curTime.seconds - UNIX_NTP_EPOCH_DIFF;
+                        coloredMsg(LOG_BLUE, "nes, cycles: %u, curTime: %lu", cycles, seconds);
+                        uint32_t stopTime = HAL_GetTick();
+                        coloredMsg(LOG_BLUE, "nes, duration: %u ms", stopTime - startTime);
+                        sntpState = SNTP_STATE_DONE;
+                        break;
+                    }
                 }
-            }
             
-            if (seconds == 0) {
-                coloredMsg(LOG_BLUE, "wizsq, time update failed");
+                if (seconds == 0) {
+                    coloredMsg(LOG_BLUE, "nes, time update failed");
+                        sntpState = SNTP_STATE_ERROR;
+                }
+            } else {
+                coloredMsg(LOG_BLUE, "nes, error when querying ntp server name");
+                sntpState = SNTP_STATE_ERROR;
             }
-        } else {
-            coloredMsg(LOG_BLUE, "wizsq, error when querying ntp server name");
         }
     }
 }
 
 uint64_t networkSntpQuery() {
-    networkSntpEngine(NULL);
+    uint64_t res = 0;
+
+    if (sntpState == SNTP_STATE_IDLE) {
+        coloredMsg(LOG_BLUE, "nsq, start sntp request");
+        sntpState = SNTP_STATE_SEND;
+        schAdd(networkSntpEngine, NULL, 1, 0);
+    } else if (sntpState == SNTP_STATE_DONE) {
+        coloredMsg(LOG_BLUE, "nsq, start sntp done");
+        res = seconds;
+        sntpState = SNTP_STATE_IDLE;
+    } else if (sntpState == SNTP_STATE_ERROR) {
+        coloredMsg(LOG_BLUE, "nsq, start sntp failed");
+        sntpState = SNTP_STATE_IDLE;
+    }
+
     return seconds;
 }