The Software has a in-built Rigctld server allowing remote programs like Gpredict to control doppler frequency shift.
When the Engage button is pressed the radio will move into satellite mode and start tracking automatically.
Single Transceiver Operation
If you are using a satellite that has only a downlink such as ISS SSTV imaging, then you should set up a second radio within Gpredict for RX only, rather than full duplex. Please refer to the screenshots supplied here.

Configuration
The default listen port is 4532 You can change it if required.