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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
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
Debug Level
The system is built from several modules that output debug messages. It is possible to configure the debug output for each module separately. There are three debug levels available:
| Level | Description |
|---|---|
| Off | The debug messages for the selected module are disabled. |
| Errors Only | Only error messages are output. This mode is useful for error tracking. |
| Full Debug | In this mode, all debug messages are output. |
The following debug options are available:
- Print Time Stamp switch enables or disables printing the time information with debug messages. If this switch is not enabled, the timing information is not printed.
- Debug level for each module defines what kind of debug messages are printed.
The owner module of the displayed debug message is identified by the message prefix. The following system and application modules are configurable for debugging:
| ID | Module | Description |
|---|---|---|
| MEM | Dynamic Memory Management | Allocates and releases frame buffers. |
| ETH | Ethernet Protocol | Handles ethernet link. |
| PPP | Point to Point Protocol | Handles serial line direct or modem connection PPP link. |
| SLIP | Serial Line Internet Protocol | Handles serial line direct or modem connection SLIP link. |
| ARP | Address Resolution Protocol | Handles ethernet MAC address resolution and caching. |
| IP | Internet Protocol | Processes the IP network layer. |
| ICMP | Internet Control Message Protocol | Processes ICMP messages. Best known example is the ping. |
| IGMP | Internet Group Management Protocol | Processes IGMP messages, Hosts groups and IP Multicasting. |
| UDP | User Datagram Protocol | Processes UDP frames. |
| TCP | Transmission Control Protocol | Processes TCP frames. |
| NBNS | NetBIOS Name Service | Maintains name access to your hardware. |
| DHCP | Dynamic Host Configuration Protocol | Handles automatic configuration of IP address, Net mask, Default Gateway, and Primary and Secondary DNS servers. |
| DNS | Domain Name Service | Handles the resolution of the IP address from a host name. |
| SNMP | Simple Network Management Protocol | Manages devices on IP network. |
| BSD | Berkeley Socket Interface | Processes TCP and UDP frames via standard BSD Sockets API. |
| HTTP | Web server | Delivers web pages on the request to web clients. |
| FTP | FTP server | Manages the files stored on the server and serves the file requests received from the clients. |
| FTPC | FTP client | Connects to FTP server to transfer files on the server, and to manage files stored on the server. |
| TNET | Telnet server | Allows remote clients to control the system using the command line interface. |
| TFTP | TFTP server | A simple service which allows to send files to or read files from the server. |
| TFTPC | TFTP client | Connects to TFTP server to send or receive files. |
| SMTP | SMTP client | Connects to SMTP server to send emails. |
An example of the debug output is:
015.0 ETH:*** Processing frame *** 015.0 ETH: Dest.MAC: 1E:30:6C:A2:45:4E 015.0 ETH: Src. MAC: 00:11:43:A4:FE:40 015.0 ETH: Protocol: IP 015.0 ETH: Length : 66 bytes 015.0 IP :*** Processing frame *** 015.0 IP : Src. IP : 192.168.1.1 015.0 IP : Dest.IP : 192.168.1.5 015.0 IP : Protocol: TCP 015.0 IP : Identif.: 0xBC73 015.0 IP : Length : 52 bytes 015.0 IP : Frame valid, IP version 4 OK 015.0 TCP:*** Processing frame *** 015.0 TCP: Src. Port: 4568 015.0 TCP: Dest.Port: 80 015.0 TCP: Seq. Num.: 4132762560 015.0 TCP: Ack. Num.: 0 015.0 TCP: Flags : SYN 015.0 TCP: Win. Size: 65535 015.0 TCP: Checksum : 0xEF81 015.0 TCP: Frame len: 32 bytes 015.0 TCP: Allocated Socket 2, port 80 015.0 TCP: Socket 2, State LISTEN 015.0 TCP: Process Options, 12 bytes 015.0 TCP: Remote MSS: 1460 015.0 TCP: Next state SYN_REC
In the above example, Ethernet, IP and TCP debug messages are enabled:
- Received ethernet packets are processed by the Ethernet layer and a debug message containing Ethernet header information is printed out. Ethernet debug information contains source and destination MAC address, ethernet frame length and ethernet protocol type.
- The packet is then passed to the IP layer. IP layer prints out IP debug messages containing the IP header information such as source and destination IP address, frame length, protocol type etc.
- When the IP layer has processed the packet, the packet is passed to the upper TCP layer. TCP layer prints out TCP debug messages containing the TCP header information such as source and destination ports, sequence and acknowledge numbers, checksum value, frame length etc.
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