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  1.   Trademarks
  2. 1 Introduction
    1. 1.1 License
    2. 1.2 IwIP Version
    3. 1.3 lwIP Customization
    4. 1.4 IwIP API
      1. 1.4.1 TCP RAW APIs
      2. 1.4.2 UDP RAW APIs
    5. 1.5 lwIP Development Home Page and Support
  3. 2 Application Examples
  4. 3 Application Setup
    1. 3.1 Hardware Setup
    2. 3.2 Software Tools
  5. 4 Download and Import the Ethernet examples
  6. 5 Enet_tcpecho_server_lwip Example Overview
    1. 5.1 Build and Flash the Program
    2. 5.2 Check and Program the MAC Address
      1. 5.2.1 Using The LM Flash Programmer
      2. 5.2.2 Using the CCS
      3. 5.2.3 Using Uniflash
    3. 5.3 Configure the Terminal Window
    4. 5.4 Run the enet_tcpecho_server_lwip Example
  7. 6 Enet_tcpecho_server_static_ip_lwip Example Overview
    1. 6.1 How to Configure lwIP for Static Address
    2. 6.2 Run the enet_tcpecho_server_static_ip_lwip Example
  8. 7 Enet_udpecho_server_lwip Example Overview
    1. 7.1 Run the enet_udpecho_server_lwip Example
  9. 8 Enet_dns_lwip Example Overview
    1. 8.1 How to Configure lwIP for DNS
    2. 8.2 How to View the DNS Traffic on Wireshark
    3. 8.3 Run the enet_dns_lwip Example
  10. 9 Enet_sntp_lwip Example Overview
    1. 9.1 Run the enet_sntp_lwip Example
  11. 10Enet_tcpecho_client_lwip Example Overview
    1. 10.1 Configure the Server IP Address
    2. 10.2 Configure the SocketTest Server and Run the enet_tcpecho_client_lwip Example
    3. 10.3 Wireshark Capture for enet_tcpecho_client_lwip Example
  12. 11Enet_adcsensor_client_lwip Example Overview
    1. 11.1 Run the adcsensor_client_lwip Example
  13. 12Enet_udpecho_client_lwip Example Overview
    1. 12.1 Run the enet_udpecho_client_lwip Example
  14. 13References

10.3 Wireshark Capture for enet_tcpecho_client_lwip Example

Figure 10-3 shows the Wireshank capture.

  1. Wireshark provides various filtering capabilities. In this example, transactions are filtered that uses tcp port 8000, which is the port number configured for the SocketTest server.
  2. As discussed previously, the TCP is a connection-based protocol. Here, you see the SYN segment sent by the client 192.168.254.85 to the server 192.168.254.75 to establish a connection and the ACK segment from the server to accept the connection.
  3. After the connection is accepted, the client sends the “Hello World!\n\r” message. See box 3 at both the top and bottom on the capture. Notice the length of the message is 16 bytes which matches the total number characters in the message.
  4. The server sends the message “This is a tcp echo example\n\r” for a total length of 28 bytes.
  5. The client echoes back the message “Client: This is a tcp echo example\n\r” for a total length of 36 bytes.
GUID-20210301-CA0I-DWPN-BNRF-1DWDDZZJTGG9-low.png Figure 10-3 Client Server Wireshark Capture for Enet_tcpecho_client_lwip