* Reference lwip-2.1.3-REL vanilla lwip version
* Use inherent NETIF callbacks instead of dhcp/ipv6/autoip
* Original commit: espressif/esp-idf@5b471a1848
Implement asio-ssl layer with three classes in asio::ssl::mbedtls:
* context -- replaces SSL_CTX, used mainly as a container to options,
certs, keys
* engine -- replaces SSL, implements the actual mbedtls operations
* bio -- implements openssl BIO specifically tailered to mbedtls and
its asio usage
Further updates:
* asio: Used shared_ptr<> for bio pairs
* asio: Add error checks to mbedtls-bio
* asio: Address potential ssl-context ownership issue
* asio: Address potential bio-engine ownership issue
* Original commit: espressif/esp-idf@d823106aa6
OpenSSL component will be discontinued in ESP-IDF v5.x. The only official TLS API will be esp-tls
Add docs warning about deprecation in v5.x
Removed all examples demonstrating usage of openssl in IDF
* Original commit: espressif/esp-idf@cfc001870c
Plus other minor update, make openssl aware of current modes (SSL_set_mode)
Update coding style in examples and tests, including copyright notices
* Original commit: espressif/esp-idf@1c8171c3e8
