Hi Todd
According to documents, If you enable hardware flow control (D7 command), the CTS pin asserts (low) when the device wakes.
There are two figures. Figure 1 shows where the CTS port is, and figure 2 shows the schematic of Stalker. You can see it’s not connected to ATmega328P MCU. You need a jumper.
figure 1
figure 2
If you have any other questions, please give feedback to us.
Thanks sincerely,
JL