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To retrieve the time from a ntp server, SNTPc_ReqRemoteTime must be call first. This will return a SNTP packet that can be computed by the function SNTPc_GetRemoteTime to retrieve the correct timecorrected time. This packet can be also use to find the round trip delay with the function SNTPc_GetRoundTripDly_us. Since the SNTP packet is only use to know the offset between the local and the server NTP time, there is no time requierement for critical time requirements to call SNTPc_GetRemoteTime or SNTPc_GetRoundTripDly_us.
Function name | Description |
|---|---|
| SNTPc_ReqRemoteTime() | Transmit a SNTP request to a NTP server and receive the answer. Return the SNTP packet received. |
| SNTPc_GetRemoteTime() | From a SNTP packet, compute the time in NTP format. |
| SNTPc_GetRoundTripDly_us() | From a SNTP packet, compute round trip delay in us. |
Shell reference
Prerequisite
µC/TCP-IP command module.
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Command | Description | Argument | Usage example |
|---|---|---|---|
| sntp_get | Request time from a SNTP server. | -4 <ipv4_address> (use IPv4 server address) -6 <ipv6_address> (use IPv6 server address) -d <domain_name> (use Domain name to get server address) | sntp_get -d sntp.server.com |
| sntp_help | Print help | none | sntp_help |
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