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That is interesting. You were able to work around the limitation by swapping the TLS identity. Regarding the issue of WICED defaulting to secp256r1 key size, did you change the values of macros uECC_CURVE and uECC_BYTES in configuration.h?
#define uECC_CURVE uECC_secp224r1
#define uECC_BYTES uECC_secp224r1_size
Also which APIs did you use for this elliptic curve secp224r1? Can you share a small sample where you used those APIs?