With the Bluetooth Car app, you can control an Arduino-based remote-controlled car via Bluetooth.
Implementation instructions:
https://polynoe.lib.uniwa.gr/xmlui/handle/11400/4916
Characters sent via Bluetooth:
For direction:
"F" for forward
"B" for backward
"L" for left
"R" for right
"0" for stop
For modes:
"1" for Remote control mode
"2" for Line-following mode (black line)
"3" for Obstacle avoidance mode