Install HHTraff, connect to a traffic signal controller and run your first session in about five minutes. Covers USB, Bluetooth and Wi-Fi connections on Android 8.0 or later. No root required.
Steps: install HHTraff free from Google Play; connect an FTDI USB-to-serial cable via a USB-C OTG adapter; open the Terminal tile; set the serial parameters for your controller (9600-8N1 in NZ and Australia); connect.
See also: Cable setup, Controller compatibility, Troubleshooting, and about HHTraff.