STM32 ETHERNET #4. TCP SERVER

[@СергейАвдеев-м3й]

Thanks to the author! I found a problem in that after several messages sent, the connection was interrupted and not restored. Everything was solved by fixing the function tcp_server_handle. static void tcp_server_handle (struct tcp_pcb *tpcb, struct tcp_server_struct *es) { struct tcp_server_struct *esTx; char buf[100]; strcpy(buf, es->p->payload); esTx = es; strcpy(buf,"+ Hello from TCP SERVER "); esTx->p->payload = (void *)buf; esTx->p->tot_len = strlen (buf); esTx->p->len = strlen (buf); tcp_server_send(tpcb, esTx); }

[@ezrakrause9343]

BOSS MAN!

[@ezrakrause9343]

MY MAN!

[@ebzadeh]

Thanks a lot! I am using STM32F767ZI and STM32CubeIDE. In this case I found HardFault error after calling "tcp_server_handle()". that was about memmory allocation for "struct tcp_server_struct *esTx;". I've added solved it "esTx = (struct tcp_server_struct *)mem_malloc(sizeof(struct tcp_server_struct));" before using "esTx" and solved it.

[@linassturys7746]

Thanks. I work with stm32f769i-disco. Couldn't get data back to client and after your fix all stated to work well.

[@linassturys7746]

in function "tcp_server_accept" is allocated dinamic variable "es = (struct tcp_server_struct *)mem_malloc(sizeof(struct tcp_server_struct));", but didn't see mem_free() on the end of function. It looks like potential memory leakage, or I am not right?

[@bobby9568]

Sir, you are the King of the world!

[@dymastro788]

Agree

[@mohammadkianibeyragh5173]

hello sir. i implement tcp server for stm32f407vet6. and with client connect to tcp server and send data and press close connection. but this only can repeat for nine times. after nine times of connect to tcp server, i cant connect to that again and i must to reset the MCU. can you know the solution?

[@vovanbuong6716]

Hi Sir, I see one issue here: In the tcp_server_handle(), the esTx is the NULL pointer.

[@prashanttandale1807]

Hi, Thanks for such a informative video on TCP server. I am trying to implement the TCP server for stm32f4 device. I followed the same steps as given in the video. I am able to get response for ping command but I am not able to connect to TCP server. Can you help me in this? I am getting "TCP connection error :10061". Anyone facing same issue?

[@PoroHard]

Hello Please tell me how I can transfer data after establishing a connection with the client, without a request from the client. Please provide a code example.

[@amir.chavoshi]

Hi, I have a problem with payload size. tot_len is working correctly with increase or decrease of client's packet but in every condition only 5 bytes of packet are stored in payload. Could you hep me please?

[@hongquanphan5582]

i'm have problem when i sended hex message through hercules, the program received it however it stop read the message at 0x00 byte, i dont know why. Can you help me with this problem?

[@mustafayasar893]

Did you find a solution?

[@controllers_knowledge]

how to handle the data if data is got corrupted?

[@controllers_knowledge]

i am getting the connection refused by the host? what could be the cause?

[@rafacostantinos5143]

hello Sir, thanks for you helpful videos. I am trying your solution on nucleoh743zi2, it seems that when I call tcp_server_init() in the main code, my board stops responding, and the ping stops and it is unreachable any more. just when I comment this line (tcp_server_init()) the pinging is restored. what would be the problem? I just added the RAW files as you recommended, then changed the ip to my board's ip, and the port to 10 as you did exactly, but my board is not responding. can you give some hands please?

[@venkyembedded]

hello sir in stm32f7 server want to send the data when server press the user button can u tell me how to implement

[@GvrVenky369]

Hello sir after server sending data to client how to clear the buffer because sometimes client is not receiving the data with out clearing that buffer

[@ControllersTech]

Just fill the buffer with NULL ('\0') characters

[@controllers_knowledge]

@@ControllersTech how to handle the data if data is got corrupted?

[@amir.chavoshi]

Hi Sir, I want to ping server with any client( other computers ). This is a problem for me and I don't know how MCU is only connecting with one computer that I runed the code on. Help me please.

[@ControllersTech]

Connect the other computers to the same network. Then you can ping

[@EasyElectronics2412]

Sir where were you i was really helpless with lwip server and client 😭😭😭

[@amorftor]

Should I plug the card's ethernet port into the computer or the router?

[@ControllersTech]

Router is preferred.

[@davenirkohlrausch2784]

Hi How can I send one message to client without one echo message?

[@ControllersTech]

Instead of sending back the echo, you can send some other message..

[@gvrvenky418]

@@ControllersTech can u tell me sir how to remove the echo part and how to send the data to client

[@controllers_knowledge]

@@ControllersTech how to handle the data if data is got corrupted?

[@fahrettinokur3003]

hi, I tried your code with stm32f4 board But send "12" return 12 . what do you think i did wrong?

[@Duster393]

Did you find a solution?

[@vivekkumarsharma7732]

Did you find a solution to this ?

[@coders01]

What to do when we use FreeRTOS?

[@ControllersTech]

Check the Playlist.. it's already covered

[@coders01]

@@ControllersTech Hello, I have seen several problems in the tcp_server_handle() function, which causes receiving from the network with errors and micro crashes. Did you manage to fix this problem? At first I thought it was because of FreeRTOS but later I realized it was because of that function.

[@andrii_harashchak]

Thanks for your great work. Really helpful video

[@noobody138]

I'm grateful, thank you for your efforts. 🥰😇

[@marcometzger7719]

Hello erveryone, with the newest CubeMX in the main function it is only "MX_LWIP_Process();" which is called. I wonder, because I have to comment out the call "pbuf_free(es->p);" line from tcp_server_handle function and don't know why. But this way all is working perfect. If the message received is longer than 100 chars the message has to be limited otherwise the program crashes.

[@controllers_knowledge]

how to handle the data if data is got corrupted?

[@maccabita1]

Thanks can you publish the full code?

[@ControllersTech]

Check description..

[@Ramachandran_S]

hi sir, your explanation was soo... good... I am using this example in NUCLEO-F439ZI EVM, I found the problem when I sent the data above 5 character, up to 5 character it came correct, If I add 6th character and above buf come with some garbage value. for your reference my result will be " hkd34 hkd34 + Hello from TCPServer techntechn techntechnW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~ŠmW~Šm + Hello from TCPServer". I try different types of memory allocation, but it cannot work, I don't know where I did the mistake. thank you

[@DarkKnight-de7np]

Thank you very much, sir.

[@iluhgasie]

I've got only one echo. After that the TCP freezes

[@Duster393]

Did you find a solution?

[@iluhgasie]

Yes

[@iluhgasie]

Delete pbuf_free at the end of handle should work.

[@Duster393]

@@iluhgasie Ty now its echoing my input but will not let me append or alter my input. Do you experience the same behaviour?

[@sunilzode2199]

@@Duster393 Maybe you have found solution coz its been 5 months, if not, use this code in your tcp_server_handle function. struct tcp_server_struct *esTx; char buf[100]; strcpy(buf, es->p->payload); // keep this if you want do processing on received data //like below I just set an LED on for particular data if((buf[0] == 0xAA) && (buf[1] == 0x55)) HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_SET); esTx = es; // This copies everything to your local variable strcpy(buf, "Hello from Sunil's TCP Server "); esTx->p->payload = (void*) buf; // This just changes the pointer to payload esTx->p->tot_len = strlen (buf); // This sets payload length esTx->p->len = strlen(buf); // This sets payload length tcp_server_send(tpcb, esTx);

[@YouTube.pr1]

Hy... I have tried this code in 439ZI. Got Ping-OK, Connected-OK, but it's stuck after one time

[@Duster393]

Did you find a solution?

[@kevingai370]

what a clear voice

[@chrislamb4723]

Using an STM32F7-144 nucleo... upon executing line 488 (esTx->p->payload = (void *)buf;) in tcpServerRAW.c I go to HardFault_Handler in stm32f7xx_it.c . I commented out the unused "get the Remote IP" and "Extract the IP" sections to make tcp_server_handle as lean as possible ... I was able to get the app working with that change. I am not sure why that worked, but I plan investigate the TCP Protocol Control Block structure in depth for clues.

[@illikkal]

struct tcp_server_struct esTx = {0}; create a variable instead of a pointer

[@controllers_knowledge]

how to handle the data if data is got corrupted?