You are viewing documentation for version:3.4.2 (latest)TLS Option Value#Macros##defineTLS "tls"Option value for default TLS version. #defineTLS_1_0 "tls_1_0"Option value for TLS 1.0. #defineTLS_1_1 "tls_1_1"Option value for TLS 1.1. #defineTLS_1_2 "tls_1_2"Option value for TLS 1.2. #defineTLS_1_3 "tls_1_3"Option value for TLS 1.3.