I implement mbedTLS to the Particle environment community library, TlsTcpClient and MQTT-TLS. This 2 library could connect to AWS/Azure…etc IoT cloud platform with certificate/private key. Now cipher suite is here. TLS_RSA_WITH_AES_128_GCM_SHA1 TLS_RSA_WITH_AES_128_GCM_SHA256 TLS_RSA_WITH_AES_128_GCM_SHA512 TLS_RSA_WITH_AES_256_GCM_SHA1 TLS_RSA_WITH_AES_256_GCM_SHA256 TLS_RSA_WITH_AES_256_GCM_SHA5