This plugin will help you connect your unity game/app to your arduino robot/project,to control it, transfer data between the arduino and windows PC or Android.
This plugin does not require Unity Plus
In case of any troubles, contact me on
my email so i can assist you.
This plugin only requires .NET 4.x frameworkThank you for the support
PS.
Once you get the plugin, move the PLUGIN folder from "SerialAPI" folder to the main asset folder.