The "Arduino simulator" is a Python coroutine that sends LED_ON / LED_OFF / PING commands via bridge.uart_send(), exactly as a real Arduino Uno would send bytes over its TX line. In Velxio (browser), ...
Bluetooth Low Energy (BLE) radio chips are ubiquitous from Raspberry Pi to lightbulbs. BLE is an elaborate technology with a comprehensive specification, but the basics are quite accessible. A ...