| lwIP
    2.1.2
    Lightweight IP stack | 
| Macros | |
| #define | SNTP_SET_SYSTEM_TIME(sec) LWIP_UNUSED_ARG(sec) | 
| #define | SNTP_MAX_SERVERS LWIP_DHCP_MAX_NTP_SERVERS | 
| #define | SNTP_GET_SERVERS_FROM_DHCP LWIP_DHCP_GET_NTP_SRV | 
| #define | SNTP_SERVER_DNS 0 | 
| #define | SNTP_DEBUG LWIP_DBG_OFF | 
| #define | SNTP_PORT LWIP_IANA_PORT_SNTP | 
| #define | SNTP_CHECK_RESPONSE 0 | 
| #define | SNTP_COMP_ROUNDTRIP 0 | 
| #define | SNTP_STARTUP_DELAY 1 | 
| #define | SNTP_STARTUP_DELAY_FUNC (LWIP_RAND() % 5000) | 
| #define | SNTP_RECV_TIMEOUT 15000 | 
| #define | SNTP_UPDATE_DELAY 3600000 | 
| #define | SNTP_GET_SYSTEM_TIME(sec, us) do { (sec) = 0; (us) = 0; } while(0) | 
| #define | SNTP_RETRY_TIMEOUT SNTP_RECV_TIMEOUT | 
| #define | SNTP_RETRY_TIMEOUT_MAX (SNTP_RETRY_TIMEOUT * 10) | 
| #define | SNTP_RETRY_TIMEOUT_EXP 1 | 
| #define | SNTP_MONITOR_SERVER_REACHABILITY 1 | 
SNTP client options list