Access DHCP options in STA mode?

[penfold42]

Can I access the additional DHCP options that my DHCP server is supplying to client ?

Things like sys log server can be provided to the clients and I'd really like to be able to access them.

Thanks !

[igrr]

Whatever is implemented in LwIP, we have access to.
You can check dhcp client source code here: https://github.com/kadamski/esp-lwip/blob/esp8266-1.4.1/src/core/dhcp.c, or a slightly more up-to-date version at bbs.espressif.com (look for "open source LwIP for SDK 1.5").

[penfold42]

Thanks - looks like it only parses DHCP options it really needs.

If anyone else is interested, I'm looking to extend it to over things like syslog, ntp and so forth.

[miky2k]

I m interested

[sauttefk]

I would like to have access to DHCP option 42 (NTP server). Unfortunately LWIP discards this option currently.

But as the code in /tools/sdk/lwip/src/ is apparently not being compiled in the Arduino IDE.

• How can I make changes to /tools/sdk/lwip/src/core/dhcp.c so they are being used in my projects?
• or even make them available to other people?

[idolpx]

I'm interested as well. I'd like to be able to set the The Captive-Portal DHCPv4 option (160).

[samacumen]

Can esp8266 be used to automatically connect to a router. The router is a dhcp server and I want esp8266 to act as a dhcp client.

Any suggestions on how to do this and if this is possible?

Thanks in advance.

[devyte]

Yes, it's standard usage. Study the examples included with the core, they are accessible from the arduino ide menu. Please close this issue, this is an issue tracker, not a support forum.

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On Aug 10, 2017 4:11 PM, "Shyam Balasubramanian" ***@***.***> wrote: Can esp8266 be used to automatically connect to a router. The router is a dhcp server and I want esp8266 to act as a dhcp client. Any suggestions on how to do this and if this is possible? Thanks in advance. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1263 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AQC6BoQF-Zq5bYoE397_3knJfvnnH8kXks5sW2QJgaJpZM4G46ZP> .

[samacumen]

@devyte, was that a response to my query? What is accessible from arduino ide menu, could you clarify? This issue is already closed. Thanks.

[devyte]

@samacumen ah yes, I was responding via email, so I couldn't tell the issue is already closed.
In the arduino ide there is an Examples item, where you can browse all included examples. When you click on one, it opens another instance of the ide, with the example opened. Just look through them, you'll find what you're looking for.

[xuanduc611]

@samacumen Did you find the way to change between DHCP and StaticIP in Station mode?

[devyte]

The examples are available from the Arduino IDE.
0.0.0.0 makes STA do dhcpc, anything else is interpreted as a static IP.
Please stop using this for questions that should be asked at a forum.

[NarinLab]

Is there any clue on how to change DHCP Server default IP range from 192.168.244.x or 192.168.4.x to other custom range such as 192.168.43.x?

I can not find any documentation on this, I need to change the default DHCP Server options on AP Mode.

Please help..

[NiKiZe]

I would like to see this reopened (unless there is some other issue or implementation for this already)
This cold be handled by for example by having a callback function that could handle all options in user code.