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As per upgrade notes of lwIP v2.1.0: socket API: according to the standard, SO_ERROR now only returns asynchronous errors. All other/normal/synchronous errors are (and always were) available via 'errno'. LWIP_SOCKET_SET_ERRNO has been removed - 'errno' is always set - and required! Refer: https://www.nongnu.org/lwip/2_1_x/upgrading.html Fixes https://github.com/espressif/esp-azure/issues/51