aws-archit wrote on February 19, 2020:
The lwIP support for Espressif was added only in the 201912.00 release (https://github.com/aws/amazon-freertos/tree/201912.00), and thus, the build does not recognize the flag in the 201908.00 release.
Is it possible for you to upgrade the version and try re-building with the AFR_ENABLE_LWIP flag?