topic Re: LWIP DHCP support in MCUXpresso SDK

LWIP DHCP support

dshettig — Wed, 05 Feb 2025 09:53:12 GMT

I am using MCU IDE v11.7.1 with SDK 2.13. the lwipots.h file has the following code:

/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
turning this on does currently not work. */

The lwipopts.h file in SDK 2.13 indicates that DHCP is not implemented in lwIP 0.5.1. Despite enabling the LWIP_DHCP macro, DHCP remains non-functional on the device, confirming the limitation. To support DHCP, an update to a newer SDK version that includes a more recent lwIP release with DHCP support is required. How should i approcah with this? which SDK version would help me out here? or is there any other way to enable DHCP?

Re: LWIP DHCP support

EdwinHz — Wed, 05 Feb 2025 21:25:45 GMT

Hi @dshettig,

Yes. Please upgrade the SDK to the latest release (version 24.12.00). Do note that in order to be able to use the latest SDK, you also require the latest version of MCUXpresso (v24.12.148).

BR,
Edwin.

Re: LWIP DHCP support

dshettig — Thu, 13 Feb 2025 10:51:35 GMT

Thanks for the reply.

Kindly confirm that I can use the suggested IDE and SDK versions with the LPC54608xx MCU.

Re: LWIP DHCP support

EdwinHz — Thu, 13 Feb 2025 21:39:02 GMT

Hi @dshettig,

Unfortunately, the LPC54608 only supports up to SDK v2.7.0. You can use this SDK with the newest version of the IDE, but the SDK itself will not be updated further in the future. In other words, a newer version of LWIP DHCP support is not available.

I apologize for the inconvenience this may cause.

Re: LWIP DHCP support

dshettig — Fri, 14 Feb 2025 05:40:47 GMT

Requesting for your support to please help me understand better by answering the below questions.

Why does the NXP MCUXpresso SDK Builder allow me to build a new SDK using the latest version (v24.12.00) for the LPC54608J512 when this MCU is only supported up to SDK v2.7.0?
Could you please elaborate a little more on the statement "LPC54608 only supports up to SDK v2.7.0"? Any web references shall be appreciated, which can be useful to me and my team.

Re: LWIP DHCP support

EdwinHz — Fri, 14 Feb 2025 20:29:30 GMT

Hi @dshettig,

I apologize for the confusion, The LPCXpresso54608 (as in the EVB) is the one that only supports up to SDK 2.7.0. As you mentioned, you can use the SDK for the MCU itself, which does support the latest SDK release (v24.12.00). Please use that SDK alongside with the newest IDE in order to have the latest LWIP release.