I’ve created a page for the development of the transmitter. Expect updates there. So far I’ve created a breadboard prototype that is able to control the motor and steering of the vehicle. At the moment I am waiting for PCBs to get manufactured and shipped.

The BLE-RC project is no longer marked as WIP, meaning it does what it needs to do at the moment. However, some time in the future I will add some new features to it, like editing and saving configuration to flash (e.g. BLE name), ability to reconfigure outputs without having to reflash the MCU, and output to a slave non-ble controller (e.g. a truck trailer).