修复 1. AGS10的TVOC 数据为准备就绪问题

2. ntp支持多次获取时间
     3. mini的同步讯飞function

boards/default_src/micropython/origin/build/lib/ntptime.py

@@ -6,21 +6,27 @@ import ustruct as struct
 # NTP_DELTA (date(2000, 1, 1) - date(1900, 1, 1)).days * 24*60*60
 NTP_DELTA=3155673600
 
-def time(host="pool.ntp.org", utc=28800):
-    NTP_QUERY = bytearray(48)
-    NTP_QUERY[0] = 0x1B
-    addr = socket.getaddrinfo(host, 123)[0][-1]
-    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-    try:
-        s.settimeout(1)
-        res = s.sendto(NTP_QUERY, addr)
-        msg = s.recv(48)
-    finally:
-        del addr
-        s.close()
-    gc.collect()
-    val = struct.unpack("!I", msg[40:44])[0]
-    return utime.gmtime(val - NTP_DELTA + utc)
+def time(host="pool.ntp.org", utc=28800, times=5):
+    for _ in range(times):
+        try:
+            NTP_QUERY = bytearray(48)
+            NTP_QUERY[0] = 0x1B
+            addr = socket.getaddrinfo(host, 123)[0][-1]
+            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+            try:
+                s.settimeout(1)
+                res = s.sendto(NTP_QUERY, addr)
+                msg = s.recv(48)
+            finally:
+                del addr
+                s.close()
+            gc.collect()
+            val = struct.unpack("!I", msg[40:44])[0]
+            return utime.gmtime(val - NTP_DELTA + utc)
+        except Exception as e:
+            error = e
+            utime.sleep(0.1)
+    raise OSError('Error fetching network time', error)
 
 # There's currently no timezone support in MicroPython, and the RTC is set in UTC time.
 def settime(times):