paho mqtt c 指定tls加密算法安全套件

通过指定enabledCipherSuites字段即可： https://eclipse.dev/paho/files/mqttdoc/MQTTClient/html/struct_m_q_t_t_client___s_s_l_options.html

基本原理：

在 Paho MQTT C 客户端中指定 TLS 算法套件（安全套件），核心是通过 SSL_CTX_set_cipher_list() 接口配置。（enabledCipherSuites 的字符串会原封不动传给 SSL_CTX_set_cipher_list() 接口）

https://github.com/eclipse-paho/paho.mqtt.c/blob/c4381a707a36967708deabb0c55179dd61075eac/src/SSLSocket.c#L661

	if (opts->enabledCipherSuites){if ((rc = SSL_CTX_set_cipher_list(net->ctx, opts->enabledCipherSuites)) != 1){if (opts->struct_version >= 3)SSLSocket_error("SSL_CTX_set_cipher_list", NULL, net->socket, rc, opts->ssl_error_cb, opts->ssl_error_context);elseSSLSocket_error("SSL_CTX_set_cipher_list", NULL, net->socket, rc, NULL, NULL);goto free_ctx;}}

https://www.ibm.com/docs/en/clearcase/11.0.0?topic=deploying-tls-ciphers

https://gitee.com/google_5/boringssl/blob/master/ssl/ssl_cipher.cc

https://docs.openssl.org/3.1/man1/openssl-ciphers/

https://docs.openssl.org/3.1/man3/SSL_CTX_set_cipher_list/#name