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SNTP
Applications

## Topics

| Options

## Functions

void | sntp_init (void)
void | sntp_stop (void)
u8_t | sntp_enabled (void)
void | sntp_setoperatingmode (u8_t operating_mode)
u8_t | sntp_getoperatingmode (void)
u8_t | sntp_getreachability (u8_t idx)
void | sntp_setserver (u8_t idx, const ip_addr_t *server)
const ip_addr_t * | sntp_getserver (u8_t idx)
u8_t | sntp_getkodreceived (u8_t idx)

## Detailed Description

This is simple "SNTP" client for the lwIP raw API. It is a minimal implementation of SNTPv4 as specified in RFC 4330.

You need to increase MEMP_NUM_SYS_TIMEOUT by one if you use SNTP!

For a list of some public NTP servers, see this link: http://support.ntp.org/bin/view/Servers/NTPPoolServers

## Function Documentation

## sntp_enabled()

u8_t sntp_enabled | ( | void |  | ) |

Get enabled state.

## sntp_getkodreceived()

u8_t sntp_getkodreceived | ( | u8_t | idx | ) |

Check if a Kiss-of-Death has been received from this server (only valid for SNTP_MAX_SERVERS > 1).

Parameters

  idx | the index of the NTP server

Returns
  1 if a KoD has been received, 0 if not.

## sntp_getoperatingmode()

u8_t sntp_getoperatingmode | ( | void |  | ) |

Gets the operating mode.

## sntp_getreachability()

u8_t sntp_getreachability | ( | u8_t | idx | ) |

Gets the server reachability shift register as described in RFC 5905.

Parameters

  idx | the index of the NTP server

## sntp_getserver()

const ip_addr_t * sntp_getserver | ( | u8_t | idx | ) |

Obtain one of the currently configured by IP address (or DHCP) NTP servers

Parameters

  idx | the index of the NTP server

Returns
  IP address of the indexed NTP server or "ip_addr_any" if the NTP server has not been configured by address (or at all).

## sntp_init()

void sntp_init | ( | void |  | ) |

Initialize this module. Send out request instantly or after SNTP_STARTUP_DELAY(_FUNC).

## sntp_setoperatingmode()

void sntp_setoperatingmode | ( | u8_t | operating_mode | ) |

Sets the operating mode.

Parameters

  operating_mode | one of the available operating modes

## sntp_setserver()

void sntp_setserver | ( | u8_t | idx,
|  | const ip_addr_t * | server )

Initialize one of the NTP servers by IP address

Parameters

  idx | the index of the NTP server to set must be < SNTP_MAX_SERVERS
  server | IP address of the NTP server to set

## sntp_stop()

void sntp_stop | ( | void |  | ) |

Stop this module.