I just want to make sure to understand the documentation about the serial I/O support for the Sodaq ONE as well as the Autonomo with a LoRaBee. To my opinion the serial I/O support is the same for both as is described at the Autonomo support site:
The SODAQ Autonomo has two hardware serial connections Serial & Serial1 and one virtual serial port SerialUSB which is used for communicating with a connected PC via the native USB port. Serial is available on pins D0 (RX) & D1 (TX). Serial1 is connected to the Bee socket.
For the Sodaq ONE, the above applies too, but Tx is on D12/A13 and Rx is on pin D13/A13. The onboard RN2483 is connected to Serial1 in both situations.