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Technical Support
On-Line Manuals
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
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TFTP Client
FTP Server
FTP Client
DNS Client
SMTP Client
SNMP Agent
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Error Function
Runtime Configuration
Library Files
Using RL-TCPnet
Stand Alone
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Event Driven Operation
IP Address Assignment
Ethernet Interface
PPP Interface
SLIP Interface
Localhost
Applications
HTTP Server
Script Language
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XML Example
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Web on SD Card
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Multi-user Authentication
Using RAM File System
FCARM File Converter
PRINT Directive
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PAGEWIDTH Directive
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Telnet Server
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Multi-user Authentication
Sending Reply Message
Short Reply
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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
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DNS Resolver
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Device Drivers
Ethernet Driver
Interrupt Mode
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Windows Dial-up
Add Direct Serial Link
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Debugging
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Function Overview
BSD Routines
CGI Routines
Ethernet Routines
FTP Routines
HTTP Routines
IGMP Routines
Miscellaneous Routines
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PPP Routines
Serial Routines
SLIP Routines
SMTP Routines
SNMP Routines
System Functions
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Telnet Routines
TFTP Routines
UDP Routines
RL-CAN
RL-USB
Example Programs
Library Reference
Appendix
Opening TCP Connection
RL-TCPnet is based on the client/server model of operation, and the TCP connection setup is based on these roles as well. Both, the client and the server, prepare for the connection by performing an open operation. However, there are two different kinds of open:
- Active Open: A client process using TCP takes the "active role" and initiates the connection by actually sending a TCP message to start the connection (a SYN message).
- Passive Open: A server process, designed to use TCP, takes a more relaxed approach. It performs a passive Open by contacting the TCP, which is like saying "I am here, and I am waiting for clients that may wish to talk to me to send me a message on the following port number". The Open is called passive because aside from indicating that the process is listening, the server process does nothing.
A passive Open can, in fact, specify that the server is waiting for an Active Open from a specific client. However, not all RL-TCPnet APIs support this capability.
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