2.1.0

Support TLS via new altcp_api connection API (https, smtps, mqtt over TLS)
Switch to cmake as the main build system (Makefile file lists are still maintained for now)
Improve IPv6 support: support address scopes, support stateless DHCPv6, bugfixes
Add debug helper asserts to ensure threading/locking requirements are met
Add sys_mbox_trypost_fromisr() and tcpip_callbackmsg_trycallback_fromisr() (for FreeRTOS, mainly)
socket API: support poll(), sendmsg() and recvmsg(); fix problems on close

Detailed Changelog