ESP32 Forum

Hi,

I am trying to port a esp8266 project to ESP32, but i am facing issues with one command:
It does so iPhones can still surf the internet while being connected to the AP.

It seems like the functionality is inside "apps/dhcpserver.h", but I cannot really figure out how to use the dhcps_set_option_info.

Any idea how to do this now? I have been trying and failing for hours, so any help would be greatly appreciated.


/Søren

Try

The code you posted works perfect, thank you so much!

If anybody else is trying this, remember to stop, apply line, start the dhcp server for it to work

Elsewhere on the web people say to disable dhcp option 3 and option 6.
https://superuser.com/questions/596053/ ... in-openwrt

But you say to use ROUTER_SOLICITATION_ADDRESS which is option 32.

So is it option 3 or 32?
I'm going to also disable option 3 and 6 just to be sure.

Where is the documentation for this?
I only found:
https://www.esp8266.com/viewtopic.php?t=1798

Nevermind, this IDF code is a mess...

It looks like it actually prevents sending ROUTER option 3, even though the API incorrectly uses ROUTER_SOLICITATION_ADDRESS (32) as a flag for that functionality.

But should we not send option 3, or send it with an invalid IP of 0.0.0.0?

Also, by setting
uint8_t opt_val = 0; // don't supply a dns server via dhcps
ESP_ERROR_CHECK(tcpip_adapter_dhcps_option(TCPIP_ADAPTER_OP_SET, TCPIP_ADAPTER_DOMAIN_NAME_SERVER, &opt_val, 1));

It is still sending option 6 - dns server. But it is just sending it's own IP. See
https://github.com/espressif/esp-idf/bl ... ver.c#L344

But shouldn't we be able to prevent sending the option 6 entirely?