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RL-ARM User's Guide (MDK v4)

RL-RTX RL-FlashFS RL-TCPnet TCP Socket Opening TCP Connection TCP Active Open TCP Passive Open Sending TCP Data Example for Sending Data Multiple TCP Connections UDP Socket Opening UDP Connection Sending UDP Data When DHCP Enabled When ARP Cache Empty Example for Sending Data IP Multicasting Multiple UDP Connections Configuring RL-TCPnet Static Configuration System Definitions Ethernet Network Interface PPP Network Interface SLIP Network Interface UDP Socket TCP Socket BSD Socket HTTP Server Telnet Server TFTP Server TFTP Client FTP Server FTP Client DNS Client SMTP Client SNMP Agent SNTP Client Error Function Runtime Configuration Library Files Using RL-TCPnet Stand Alone With RTX Kernel Event Driven Operation IP Address Assignment Ethernet Interface PPP Interface SLIP Interface Localhost Applications HTTP Server Script Language CGI Functions Ajax Support Using XML XML Example How it works SOAP Support SOAP Interface Large POST Messages Web Pages Default Page Error Pages Web on SD Card Web Update File System Interface Http Caching How it works Internal Web External Web Multi-user Authentication Using RAM File System FCARM File Converter PRINT Directive NOPRINT Directive PAGEWIDTH Directive PAGELENGTH Directive ROOT Directive Telnet Server Command Line Interface Multi-user Authentication Sending Reply Message Short Reply Long Reply Continuous Screen Update TFTP Server File System Interface TFTP Client File System Interface FTP Server File System Interface Multi-user Authentication Supported Commands FTP Client File System Interface SMTP Client SNMP Agent MIB Database MIB Interface MIB Entry MIB Table DNS Resolver Starting DNS Device Drivers Ethernet Driver Interrupt Mode Modem Driver Serial Driver Using Serial Link Cable Connection Modem Connection Windows Dial-up Add Direct Serial Link New Dial-up Connection Configure PPP Dial-up Configure SLIP Dial-up Debugging Enabling Debug Debug Level Redirecting Output Function Overview BSD Routines CGI Routines Ethernet Routines FTP Routines HTTP Routines IGMP Routines Miscellaneous Routines Modem Routines PPP Routines Serial Routines SLIP Routines SMTP Routines SNMP Routines System Functions TCP Routines Telnet Routines TFTP Routines UDP Routines RL-CAN RL-USB Example Programs Library Reference Appendix

SNTP Client

The SNTP Client allows you to get the current time from NTP server.

The following SNTP Client options are configurable from the Net_Config.c configuration file:

  • SNTP Client switch enables or disables the SNTP Client service in your application. It is enabled when this value is set to 1. It should be set to 0 when the SNTP Client is not used in your application.
    #define SNTP_ENABLE     1
  • Broadcast Mode enables or disabled the broadcast mode of SNTP Client service. In broadcast mode, SNTP Client opens UDP port for receiving broadcasted NTP messages in local network. This option should be disabled to access a public NTP server located on internet.
    #define SNTP_BCMODE     0
  • NTP Server specifies the IP address of the NTP Server which:
    • receives get time requests in unicast mode
      (usually a public NTP server on internet)
    • broadcasts NTP messages in broadcast mode
      (local NTP server in local network).
    This IP address is used when the NTP Server IP is not specified in snmp_get_time() function parameter.
    #define SNTP_SRVIP1    217
    #define SNTP_SRVIP2    79
    #define SNTP_SRVIP3    179
    #define SNTP_SRVIP4    106


  • When the SNTP client is not enabled, the ARM linker does not link the SNTP support modules to your application and thus reduces the code size and memory usage.
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