Describe problem solved by the proposed feature
The lwip version that RT-Thread support now is 2.1.2, which has been discontinued since 2018. lwip component itself have move it's mainline to 2.2.x, and the newest version now is 2.2.1 which released at 2025, this version provide obvious improvements in functionality, stability, and security.
We need to update this component for RT-Thread.
Describe your preferred solution
No response
Describe possible alternatives
No response
Describe problem solved by the proposed feature
The lwip version that RT-Thread support now is 2.1.2, which has been discontinued since 2018. lwip component itself have move it's mainline to 2.2.x, and the newest version now is 2.2.1 which released at 2025, this version provide obvious improvements in functionality, stability, and security.
We need to update this component for RT-Thread.
Describe your preferred solution
No response
Describe possible alternatives
No response