Operational status of the SNTP sub-system.
The value is a bit mask:
0 SNTP disabled
1 local system clock synchronized
2 SNTP loop detected
4 generic error
8 once synced, client disabled
100 server 1 not synchronized
200 server 1 bad protocol version
400 server 1 not responding
10000 server 2 not synchronized
20000 server 2 bad protocol version
40000 server 2 not responding
(Note that all values are hexadecimal.)