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STM32F107_LK LWIP User Guide

1. User Guide Sf STM32F107 LWIP Demos user guide Introduction STM32F107xx connectivity line microcontrollers feature a complete 10 100 Ethernet MAC supporting MII and RMII with hardware support for the IEEE1588 precise time protocol enabling Ethernet connectivity for real time applications The objective of this application note is to introduce the different demos included in the LWIP TCP IP package for the STM32F107_LK board e Inthe first part you will find information on the hardware and software required and how to configure it e The second part explains how to run these demos Note You will find additional information on LWIP package for STM32 in the Application note AN3102 available here http www st com stonline products literature an 16620 paf You will find the link to the STM3210C EVAL LWIP demo firmware here http www st com stonline products support micro files an3102 zip STM32F107 LWIP Demos user guide Content 1 EVER elteno n MONE E EEE 1 1 What do you need ccsscccccccceeseeeeeseeseeessseeeeseeeas 1 2 How to configure the STM32F107 Learning Kit 1 3 Demo applications liSt ccceecececeessseeeesseeeeeeeeeeees 1 4 Modules per Demo cccccccseeeeeeeeeeeenseeeeeeeeeeeaneeeees 2 Demos User Guide secorra eeir 2 1 Simple Application ccceeeeeceeeeceeeseeeeeeeaeeeseeeeeeeenees 2 2 2 3 2 4 2 9 2 1 1 How to compile and download the demos 2 1 2 How
2. 0 0 8 roman pproximate round trip times in milli seconds og 3c 14 fO 00 00 80 a2 7b c0 a8 01 03 cO ag a N E E le ay Be Minimum Ams Maximum Gms Average Ams 01 02 08 00 e6 5b 03 64 00 61 62 63 64 65 66 zs fda 67 68 69 6a 6b amp c 6d 6f 70 71 72 73 74 75 76 ghijkimn opg 77 61 62 63 64 65 66 68 69 wabcdefq hi Broadcom Netxtreme Gigabit Ethernet Driver lt li Packets 621 Displayed 8 Marked 0 Profile Default Note Wireshark can only monitor the traffic sent or received by the PC you won t be able to monitor the traffic between 2 boards 9 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 2 Telnet Application follow the procedure described in the Simple Application chapter on how to start the application This demo implement a simple telnet application Once the telnet connection is open between the PC and the Board a simple helloword communication takes place To run this demo you need to open a telnet connections as follow 1 You can first check the connection between your PC and the board using a PING command once done you can run the Microsoft telnet client from the command line window using the command telnet oa f WINDOWS Syg LET A LCMmd exe _ oj x C gt ping 192 168 1 2 Pinging 192 168 1 2 with 32 bytes of data p Reply from 192 168 1 2 bytes 32 timetims TIL 255 Reply from 192 168 1 2 bytes 32 timetims TIL 255 Reply from 192 1
3. 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 1 2 How to configure the STM32F107 Learning Kit Here is the required configuration of the demoboard JP1 amp JP2 set to UserFlash position 0 X or jumper position 2 3 JP3 amp JP4 set JP5 amp JP6 set to Ethernet position jumper position 2 3 On the back of the demoboard MII must be selected To do so you need to solder the 3 jumpers on the lower right side f f PNE PT Letia PA y s f By 7 F 7 lt 4 S Q9 A Y A N m x 4 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 1 3 Demo applications list Simple Demo The TCP IP Stack without application modules Telnet Demo A simple helloword application using the Telnet protocol UDP TCP Client Demo A set of 2 demos to be loaded on different boards at least one client one server UDP amp TCP Packets are exchanged between the 2 boards to control some LED ems re aang a ne SnsieTs ST your browser TFTP Demo A TFTP demo to get files from the demo board or put file into an SD card inserted in the board card reader 1 4 Modules per Demo The LWIP TCP IP stack already contains many modules not all the modules provided are used in each demos The table below shows which modules are compiled or not in each example TCP IP Key Modules PP ication U w Demo Name Demos Application lt O Q Cc
4. Hel Start Stop Buttons ek L oOeFZ S 8 QQQAN BERK DB ip host 192 168 1 2 View Go Expression Clear Apply Filter to display only the packets form or to the target board Filter No Time Source Destination Protocol Info mai 7 Na a 192 168 3 192 168 2 553 152 634208 558 153 623773 559 153 623923 562 154 639831 563 154 639968 569 155 655550 570 155 655688 ICMP Echo ping request selected Frame Echo ping reply Echo ping request Echo Cping reply Echo ping request Echo ping reply Echo ping request Echo Cping reply PEPPER Eels WNW WN Wo A bea rae Saks a OF oe pas a Ls Protocol type PING is using ICMP Source Destination PING Requests amp Replies ICMP requests sent by the PC 192 168 1 3 ICMP requests sent to the Target board 192 168 1 2 ICMP Replies sent by the Target board 192 168 1 2 ICMP Replies sent to the PC 192 168 1 3 bytes captured Ethernet II Src Foxconn_2b e7 a0 00 15 58 2b e7 a0 Dst 00 00 00_00 00 01 00 00 00 00 00 01 Internet Protocol Src 192 168 1 3 192 168 1 3 Dst 192 168 1 2 192 168 1 2 Internet Control Message Protocol ct C WINDOWS system32 cmd exe Raw data of the selected frame Details of the selected Frame Reply from 192 168 1 2 bytes 32 time lt ims TTL 255 Ping statistics for 192 168 1 2 Packets Sent 4 Received 4 Lost z los oo 00 00 00 00 01 00 E7 AV 3080045300 c 0 0 0 0
5. M E General Options C C Compiler Ha B stm32f107 c x ERRA a i i stm32f1 Ox_itc Output Converter tup Do nload Extra Options Plugins cue Custom Build Build Actions Dri MV Runto Linker ST Link Simulator iF Angel NR Server For Keil RVMDK users E File Edit View Project Debug Flash Peripherals Tools SYCS Window Help ajz asung RO os ee ssa m aal ala wj Ee A Re A STM32F107_LK Je _ aa Ss ak WS Check that the debugger settings Debug your application l al 045 int mainivoic match your confiquratio 046 Options for Target STM32F107_LK x w E stm32f10x t c 047 bad netconf c 048 Device Target Output Listing User C C Asm Linker Debug Utilities rt main_Simple c 049 P Bit ydar a stm32_eth h o50 C Use Simulator Settings Use ST Link Debugger Settings Project stm32F10x h 051 I Limit Speed to Real Time ix Core_cm3 h 052 L stdint h 053 sa system_stm32F10x h 054 f stm32F10x_conf h 055 wr Device Target Output Listing User C C Asm Linker Debug Utilities Ll Tie Us ade a 056 i i Configure Flash Menu Command a stm32f10x_exti h 057 i stm32f10x_flash h I 058 Use Target Driver for Flash Programming x stm32F10x_gpio h 059 ST Link Debugger Settings V Update Target before Debugging a stm32F10x_i2c h O60 it File i a stm32f10x_rcc h 061 Ini
6. TFTP GET transfer Server interfaces 192 1687 Titp Server Tftp Client Log viewer Host 192 168 1 2 Port 69 name of the file to copy on the PC Local File C TEMPSLK2PC aA uc y of the file to get from the Target Peak Ee Remote File Block Size Default v Frame 83 64 bytes on wire 64 bytes capture Ethernet II fsrc Foxconn_2b e7 a0 00 15 56 amp Internet Profocol Src 192 168 1 3 192 168 User Datagram Protocol Src Port tappi box 5 Trivial File Transfer Protocol Opcode Read Request 1 Source File PC2LK 0 block retransmitted i 1 block transferred in 0 second MDS 69ba530Fc75e848e17790e96cd89a942 Type octet Option tsize ood 0000 0000 00 00 00 OO 00 01 00 15 58 2b e7 a0 08 0045 00 Mteaee s Ee 0010 QQ 32 36 49 00 00 80 11 81 1c cO a8 O1 03 cO ag PRETa Kan 0020 01 02 09 02 0045 00 le da cc OO 01 50 43 32 4C a PC2L 0030 4b 00 6f 63 74 65 74 00 74 73 69 7a 65 00 30 00 k octet tsize 0 Broadcom Netxtreme Gigabit Ethernet Driver lt li Packets 208 Displayed 3 Marked 0 Profile Default 16 16 S7 STM32F107 LWIP Demos user guide
7. to run the simple demo 2 1 3 Using Wireshark to monitor the network traffic Telnet APplication ccccccessccecssesseeeeeessseeeeesaeseeees UDP TCP Client Server G MOS ccceeeeeeeeeeeee sees 2 3 1 UDP TCP Client Demo 2 3 2 UDP TCP Server Demo Web Server Dem c ccccccececcecececceccecuccececcacaeceeees IFIF O ONO acces cee cee ceenaeesesonass EET 2 5 1 How to run the TFTP demo 2 9 2 How to use tftpd32 and wireshark software lt STM32F107 LWIP Demos user guide 2 16 STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 1 Introduction This first chapter gives an introduction on how to use the different demos provided It explains what are the hardware amp software required how to configure it It also includes a simple description of the different demos purpose and content 1 1 What do you need Here is the hardware required to run these demos The STM32F107_LK Demo board some demos require at least 2 boards A JTAG debugger supported by IAR Workbench or RVMDK A 5V power supply An Ethernet cable to connect the board to your PC or to your Network STAG be ai ta Bk Note the RS232 link to PC is not used in the current LwIP Package Here are the softwares required IAR Workbench 5 x or RVMDK a TFTP Client like tftpd32 available here http tftpd32 jounin net a Network analyzer like WireShark available here http Awww wireshark org 3
8. 1 3 192 168 ser Datagram Protocol Sre Port x25 svc pc Get Put Bieak Trivial File Transfer Protocol eee eee Opcode Data Packet 3 Block 1 Data 11 bytes HH amp amp 00 00 00 00 00 01 00 15 58 2b e7 ad 08 00 45 00 OO 2b 2d 26 00 00 80 11 8a 46 cO ag O1 03 cO ag 4 HelloWord 01 02 07 ce 10 00 0017 62 cf 00 03 00 01 48 65 6c 6c GF 77 GF 72 64 Od Oa File C DOCUME 1 STEPHA 1 LOCALS 1 Te Packets 233 Displayed 4 Marked 0 Dropped 0 Profile Default Once the PUT transfer is completed you can see that the file PC2LK was copied in the SD card Removable Disk E Ae Edit View Favorites Took Help pa Bi E PC2LK Notepad Q ik x amp wi J Search E gt ler She File Edit Search View Format Language Settings Macro Run ls TERE ee ee a Go ea Re saw im DC me fpe 4 Folders Ej Desktop i G My Documents i My Computer See Local Disk ici 4 DYDICD RW Drive D Removable Disk Es Ln 1 Col 1 Sel 0 15 16 S7 STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide Now that there is one file into the SD Card can perform a GET operation to copy it back to the PC Here is a GET transfer Broadcom NetXtreme Gigabit Ethernet Driver Capturing Wireshark O X File Edit View Go Capture Analyze Statistics Help Seas SAXTA e aF 2 88 A9QH SUax es Etter ip host 192 e 408 L v Expression Clear Apply Illl
9. 68 1 2 bytes 2 timetims TIL 255 Reply from 192 168 1 2 bytes 32 timetims TIL 2455 Ping statistics for 192 168 1 2 Packets Sent 4 Received 4 Lost Az loss gt Approximate round trip times in milli seconds Minimum Bms Maximum Bms Average Pms Ge Sete lnet a 2 Then you need to connect the client to the board by using the command open X X X X where x x x x is the IP address of the board ex 0 NDOWS ystem3 cmi Exe eime o xi TEP to Microsoft Telnet Client scape Character is CTRL il Microsoft Telnet gt 7 Commands may be abbreviated Supported commands are close close current connection display display operating parameters open hostname port connect to hostname default port 23 gt quit exit telnet set set options type set 7 for a list gt send send strings to server status print status information unset unset options type unset 7 for a list he lp print help information Microsoft Telnet open 192 168 1 2_ 3 Then you should see the following Helloword communication ay 1LE2lhne 5 J 166 1 2 oO x Hello What is your name TH32F167_LK Hello STMH32F107_LE 10 16 STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 3 UDP TCP Client Server demos Theses demos implement a simple client server communication protocol data exchange 1 byte data length One server board and one or more client boards are required to run this exa
10. D a SN uoieoddy dO1l ddn Simple Dero Teretbeno voP ToP Ghent UOP TOP Sener Web server Demo TFTP Demo S x ie e Spe omoirer x lt x y yfsistsis sma ROCECCL S fe Syys fue x x oe 5 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 Demos User Guide The LWIP package for STM32F107xx connectivity line microcontrollers comes with a rich set of demos A simple application implementing the LwiIPTCP IP stack DHCP Client and PING application once the STM32F107_LK board is connected to a DHCP server it gets its IP address and displays it on the LCD the Ping application is available to check that the STM32F107_LK board is responding to ping requests A simple Telnet demo allow the PC to open a telnet connection with the board This example is a simple Helloword over telnet kind of application UDP TCP Client Server this is a simple example based on a minimum of two STM32F107_LK Boards One board is Server and all others are Clients It provides source code examples for UDP and TCP connections Webserver Demo it displays an html page once the STM32F107_LK board IP address given by the DHCP is typed in the web browser This introduction page includes a presentation of the embedded protocols in LWIP Another page shows a status bar displaying instantaneously the potentiometer RV1 analog input conversion available on STM32F107_LK board The user ca
11. TL 255 Reply from 192 168 1 2 hytes 32 timetims TTL 255 Ping statistics for 192 168 1 2 Packets Sent 4 Received 4 Lost 4 CH loss gt Approximate round trip times in milli seconds Minimum Ams Maximum ms Average fms 2 1 3 Using Wireshark to monitor the network traffic Wireshark Network analyzer is a freeware that allows you to see the packets exchanged between the PC and the Board To do so you need to run Wireshark and in the menu Capture Interfaces select the network interface you want to log The Wireshark Network Analyzer File Edit Statistics Help 8 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide Wireshark Capture Interfaces Description IP Packets Packets s al Adapter For generic dialup and VPN capture E Broadcom Metxtreme Gigabit Ethernet Driver 192 ig l3 Gl E Intel R PRO Wireless 220066 Metwork Connection unknow E Mortel IPFSECSHM Adapter Eacfilt Miniport 0 0 0 0 Click here to start the Packet Log Make sure to use the appropriate filter to display only the relevant part of the network traffic Then you will get the following log In the Screen capture below you will find an IP address filter ip host 192 168 1 2 the packets sent or received by this IP address for a PING command The details of one frame Broadcom NetXtreme Gigabit Ethernet Driver Capturing Wireshark File Edit Capture Analyze Statistics
12. bed in the client demo example 2 4 Web Server Demo follow the procedure described in the Simple Application chapter on how to start the application In this demo a simple webserver application is loaded into the board and accessed using your webbrowser In this example the board and the computer are connected on the same network each of the devices getting its IP address from the DHCP server gt STM32F107 Windows Internet Explorer provided by Corporate PackageFabric ST BHA OQ E rpnsz161 21 l es Bel gt lt econ mi lt We k stmszr107 A BG me Page E Tools STMicroelectronics IST STM32F107 Webserver Demo Based on the IwIP TCP IP stack The STM32 connectivity line is new STM32 line from ST It is 32 bit microcontroller with USB OTG Ethernet with IEEE 1588 dual CAN audio class PS The STM32 connectivity line is intended for applications where connectivity and real time performance are required industrial control control panels for security applications UPS car home The family includes devices with 64 to 256 Kbytes of on chip Flash memory up to 64 Kbytes of SRAM and 14 commmnniation interfaces LQF64 LQFP100 and BGA100 packages are available The STM32 connectivity line home page About this demonstration This webserver is a part of a demonstration package developed on the top level of the IwIP TCP IP stack The package contains five a
13. e client broadcasts a UDP Packet on the network on the same port The server answers a UDP Packet to the client on a different port 0x4 in this demo Now both the client and the server know each other s IP address Part 2 TCP Transfer The server listen for TCP Data on a dedicated port 0x4 in this demo Now that the client knows the server s IP address it setup a TCP connection on this port Each time a is pressed the client send a simple TCP packet to the server to turn on or off the LED NOTE It is mandatory to first run the server board and then turn on the client board otherwise the boards may not find each others 11 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 3 2 UDP TCP Server Demo follow the procedure described in the Simple Application chapter on how to start the application This demo requires to have at least one other board configured as a client Make sure that your starts the server board firsts then the client board Once connected you should see the following The s x x x x is the server IP address in this example 192 168 1 2 is the board IP address Once connected to the client c x x x x will be displayed on the screen giving the client s IP address In this example 192 168 1 4 is the IP address of the remote client Once you see this screen the server s depending on the TCP packets received from the client The workflow is the same as the one descri
14. e interface Mtpd3 by Ph Jounin Curent Directory CATEMP Browse server interfaces 192 1 6814 Tito Server Tftp Client Log viewer PO Address q arget Address TFTP server Port ee used TFTP default 6 Remote File EN se Da cre of the file on the PC ae Default a Mame of the file on the Targ TFTP PUT and TFTP GET commands ee PUT the client put a file on the server from PC to target GET the client get a file from the server from target to PC Settings ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide WireShark is also used to see the TFTP packets exchanged between the PC and the board Here is a PUT Tranfer Untitled Wireshark File Edit View Go Capture Analyze Statistics Help TAAA SExXx2ZSi ie aF Raan FARK Filter Jip host 192 168 1 2 0 Expression Clear Apply Protocol Info Destination Tftpd32 by Ph Jounin E x Current Direct lesee o B TFTP PUT Transfer of the file PC2LK 11 bytes ms Neen rowse ever interfaces 19216813 Show Dir Titp Server Pant Log viewer Host 192 168 1 2 Pal _ a Tftpd32 Local File C TEMP PC2LK 7 1 block transferred in 1 second Remote File PC2LK2 J 0 block retransmitted peek Default MDS 69ba530Fc75e848e17790e96cd89a942 ize Ml rame 5 57 bytes on wire 57 bytes capturec thernet II Src Foxconn_2b e7 a0 00 15 56 Internet Protocol src 192 168
15. el 14 analog input converted value This ADC Channel is connected to the STM3210C EVAL board s potentiometer This status bar is updated automatically each 1s with the last converted ADC Channel 14 value You could check this by changing the potentiometer position and check that the status bar is updated by an automatic refresh of this page with the new converted value STM32 Webserver ADC Conversion Status Bar Input Channel 14 Potentiometer RV1 13 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 5 TFTP Demo 2 5 1 How to run the TFTP demo Follow the procedure described in the Simple Application chapter on how to start the application load the TFTP project in the STM32F107_LK board and run it In this example the server is the demo board and the PC is the client the GET command of the Client the PC will request a file from the server and transfer it from the board to the PC the PUT command of the Client the PC will send a file to the server transfering it from the PC to the board In this example the files transferred from the PC to the board are stored in the SD card connected on the STM32F107_LK So you need to make sure that a properly formatted SD Card is inserted into the card reader Nv vp NL SOV GStONS du MVSOCOOYNSNS OvIG O YN 2 5 2 How to use tftpd32 and wireshark software The following example tftpd32 is used as a tftp client on the PC Here is th
16. mple Both can be directly connected with a crossover cable or plugged to a network with straight cables If a DHCP server is available both boards get dynamic IP addresses Once connected to the server the board sends a TCP frame with 1 bytes of data on an opened connection asking to set reset the LED1 when the Key B3 Is pressed If the Key B2 is pressed the application sends a TCP frame with 1 bytes of data on an opened connection asking to set reset the LED2 Depending on the byte value it requests the Server application to set or reset the corresponding LED 2 3 1 UDP TCP Client Demo follow the procedure described in the Simple Application chapter on how to start the application This demo requires having one other board configured as a server Make sure that your Starts the server board firsts then the client board Once the 2 boards are connected you should see the following The c x x x x is the client IP address in this example 192 168 1 4 is the board IP address Once connected to the server s X x x x will be displayed on the screen giving the servers IP address In this example 192 168 1 2 is the IP address of the remote server Once you see this screen you are able to control the server s LEDs using the 2 buttons of the board Here is the detailed communication flow between the client and server Part 1 UDP Transfer The server listen for UDP Data on a dedicated port 0x7 in this demo Th
17. n modify the potentiometer position and the status bar shape is updated accordingly Another LED control page allows the user to turn ON OFF the LEDs of the board TFTP Server this lets the user PUT and GET files from the remote PC client to the STM32F107_LK board Server The files are read from or written into the SD Card inserted in the SD Card reader of the STM32F107 board 6 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide 2 1 Simple Application This simple example provides an application template see below the procedure to run this example In this example the board is connected on a network with a DHCP server it automatically get this IP address You may PING the board from your PC to check it is properly connected on the network 2 1 1 How to compile and download the demos Once you opened the project with your IDE IAR workbench or Keil follow the steps describes in the screen capture below to compile and run the demo For IAR Workbench users AR Embedded Workbench IDE Edit he ct Tools N 1 Build your project _____ sao S ivy suns sasiup FFE pE e a a Project STM32F1 file main c 3 Debug your application i anthor vli Lon Tear ef eo a La G Libraries m BS Options for node Project Ha G LwiP aG User Ha A STM32F1 07_LK e Factor Settings Lae main Simple c 2 Check your debugger Settings _Factoyy Settings La
18. pplications ADHCP client lt gt Done Ca Internet 100 v 12 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide Clicking the led control link will bring you to a simple form allowing you to control the LED on the board Please note that only 3 LEDs are available on the STM32F107_LK gt STM32F107LED Windows Internet Explorer provided by Corporate PackageFabric ST er J http 192 168 1 2 STM32F107LED html 4 c ez We de stszrio7e A D k gi fh irp Page C Tools STM32F107 Leds control This page allows you to control the four LEDs LED1 LED2 LED3 and LED4 located in the STM3210C EVAL board To put on off a LED you have to check uncheck its corresponding checkbox Then you have to click on Send button to submit the new LEDs configuration Finally check in the STM3210C EVAL board that you get the desired LEDs are putted on off LED way CILED2 ae LEDS OLED OLED4 The ADC input displayed on the webpage is controlled by the potentiometer on the lower left corner of the STM32F107_LK demo board STM32F107ADC Windows Internet Explorer provided by Corporate PackageFabric ST er yy E http 192 168 1 2 5TM32F107ADC html itel X Google Pir pa i s w k sm32F107ADC r fp GE mh Pag i Toos STM32F107 ADC status bar This page allows you to get continuously the ADC Chann
19. t File Edt tm32F10 wh ees ae h me Use External Tool for Flash Programming ls stm32F10x_usart h 064 Bonm SS E sa misc h O65 Arguments ix netconf h v 066 Ba lgi ih ai 4 F Aun Independent gt 0 I B man Simp Dialog DLL Parameter Dialog DLL Parameter IRamiurtia mil Doe tianarinnic aminti Mil aOTLHAAIA NA S n 7 16 Ky STM32F107 LWIP Demos user guide STM32F107 LWIP Demos user guide Note The IAR projects are build using IAR Embedded Workbench version 5 4 If these workspaces are opened with older version of IAR Embedded Workbench an error message will be displayed and some of the project configuration will be lost One way to overcome this incompatibility is to get the newest version of IAR Embedded Workbench and open the project Then you can use this new version of IAR or recopy the project settings and complete the part of the configuration that was lost in your older IDE 2 1 2 How to run the simple demo When running this demo on a network with a DHCP server you should see the following Lookt ns tor DHCP server bd niaana majit PstCaeo WAAL us ips 1 Warr rrerrreererett i 2 4 1213 EH Then you will be able to send a Ping command to the board Pinging 192 168 1 2 with 32 bytes of data Reply from 192 168 1 2 bytes 32 time lt ims TTL 255 Reply from 192 168 1 2 bytes 32 time lt ims TTL 255 Reply from 192 168 1 2 bhytes 32 time lt ims T

STM32F107_LK LWIP User Guide

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