Thank you WiFive for your response.
I looked at the link you mentioned and decided not to use loop-back but send information to my gateway.
My gateway is returning the data back again then.
Please find below my program. I don't receive anything at my gateway and nothing is returned.
Any clues what ...

Hello,

I have the below program.
Function recvfrom(...) in receive_UDP(...) returns -1 with error-code 11.
I believe this is caused by a time-out but I should receive the "Hello world!"-text instead ?
Is there someone who could help me finding what is wrong ?

Best regards,

Wamor

/* HTTP GET ...

Hello kolban,

Thank you for you explanation.

I use the following code:
char *data = "Hello world";
r = send(socketnumber, data, strlen(data), 0);
ESP_LOGI(TAG, "... done sending to socket. Last read return=%d errno=%d", r, errno);

My socketnumber is obtanined like this and seems to be 0 ...

Hello,

I am using the following line in my code: r = send(socket, data, strlen(data), 0);
r is -1 and the errno is: 22.
is there a list of errornumbers with their explanation?

Thank you and regards,

Wamor

Hello kolban,

Thank you for your response.
I will get me some good books about TCPIP and sockets.

Regards,

Wamor

Hello Angus,

What I basically want to do is receiving UDP-packages from a remote computer and send them out as analog values through the DAC of the ESP32. I hope this make sense to you.

Regards,

Wamor

Hello,

I wrote a small program which once connected to wifi should receive TCPIP packages.
My program is listed below:
nvs_flash_init();
tcpip_adapter_init();
ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
ESP_ERROR_CHECK( esp_wifi_get_mac(WIFI ...

Ok,

Solved my problem.
esp_wifi_reg_rxcb was renamed to esp_wifi_internal_reg_rxcb and was moved to esp_wifi_internal.h.
esp_wifi.rst was not updated for this.

Regards,

Wamor

Hello,

I'm busy writing an application which read TCPIP-data over Wifi.
I learned that this should be done with a callback-function called: esp_wifi_reg_rxcb but this function is missing in esp_wifi.h.
It is described in esp_wifi.rst. Should this still be added or do I need to download the latest ...