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By bboyho
The RedBoard can work as a serial bridge by making the UART pins inputs so they do not contend with the lines on the serial UART as explained in the tutorial you linked. I discovered this from another engineer ... -debugging. While slower, you can also use the ATmega328P as a software serial passthrough. Both examples are illustrated here with a GPS receiver => ... e#examples.

As a quick note, I adjusted the software serial library for the LS20031 GPS receiver based on a customer's comment. Most of the time you will not need to adjust the buffer in the SoftwareSerial.h.