private void connectToIoT()

in amazonfreertossdk/src/main/java/software/amazon/freertos/amazonfreertossdk/AmazonFreeRTOSDevice.java [800:854]
50 lines of code
10 McCabe index (conditional complexity)

    private void connectToIoT(final Connect connect) {
        if (mMqttConnectionState == AmazonFreeRTOSConstants.MqttConnectionState.MQTT_Connected) {
            Log.w(TAG, "Already connected to IOT, sending connack to device again.");
            sendConnAck();
            return;
        }
        if (mMqttConnectionState != AmazonFreeRTOSConstants.MqttConnectionState.MQTT_Disconnected) {
            Log.w(TAG, "Previous connection is active, please retry or disconnect mqtt first.");
            return;
        }
        mIotMqttManager = new AWSIotMqttManager(connect.clientID, connect.brokerEndpoint);

        Map<String, String> userMetaData = new HashMap<>();
        userMetaData.put("AFRSDK", "Android");
        //userMetaData.put("AFRSDKVersion", AMAZONFREERTOS_SDK_VERSION);
        userMetaData.put("AFRLibVersion", mAmazonFreeRTOSLibVersion);
        userMetaData.put("Platform", mAmazonFreeRTOSDeviceType);
        userMetaData.put("AFRDevID", mAmazonFreeRTOSDeviceId);
        mIotMqttManager.updateUserMetaData(userMetaData);

        AWSIotMqttClientStatusCallback mqttClientStatusCallback = new AWSIotMqttClientStatusCallback() {
            @Override
            public void onStatusChanged(AWSIotMqttClientStatus status, Throwable throwable) {
                Log.i(TAG, "mqtt connection status changed to: " + status);
                switch (status) {
                    case Connected:
                        mMqttConnectionState = AmazonFreeRTOSConstants.MqttConnectionState.MQTT_Connected;
                        //sending connack
                        if (isBLEConnected() && mBluetoothGatt != null) {
                            sendConnAck();
                        } else {
                            Log.e(TAG, "Cannot send CONNACK because BLE connection is: " + mBleConnectionState);
                        }
                        break;
                    case Connecting:
                    case Reconnecting:
                        mMqttConnectionState = AmazonFreeRTOSConstants.MqttConnectionState.MQTT_Connecting;
                        break;
                    case ConnectionLost:
                        mMqttConnectionState = AmazonFreeRTOSConstants.MqttConnectionState.MQTT_Disconnected;
                        break;
                    default:
                        Log.e(TAG, "Unknown mqtt connection state: " + status);
                }
            }
        };

        if (mKeystore != null) {
            Log.i(TAG, "Connecting to IoT using KeyStore: " + connect.brokerEndpoint);
            mIotMqttManager.connect(mKeystore, mqttClientStatusCallback);
        } else {
            Log.i(TAG, "Connecting to IoT using AWS credential: " + connect.brokerEndpoint);
            mIotMqttManager.connect(mAWSCredential, mqttClientStatusCallback);
        }
    }