M2Mqtt + SSL

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            MqttClient client = new MqttClient(mqttServerIp, mqttServerSslPort, true, null, null, MqttSslProtocols.TLSv1_2, base.CheckValidationResult);
            client.ProtocolVersion = MqttProtocolVersion.Version_3_1;
            client.MqttMsgPublishReceived += client_MqttMsgPublishReceived;
            client.MqttMsgSubscribed += client_MqttMsgSubscribed;
            client.Connect(loginInfo.mqttClientId, bindInfo.deviceId, bindInfo.secret);