Suggestion: Universal board support.

[dojyorin]

Currently this library only works on certain boards, what about making it work on other boards too?

Since communication between MCU and NINA-W102 is carried out via a serial interface, I think in principle it is possible.

I think this would be useful when building a custom board connecting an arbitrary MCU to a W102 flashed with arduino/nina-fw.

I don't know details of this library so I apologize if I'm wrong, but for example, how about using a user-defined serial object if none of #if macros below match?

ArduinoBLE/src/utility/HCIUartTransport.cpp

Lines 24 to 40 in 9263b3a

	#if defined(ARDUINO_SAMD_MKRWIFI1010) || defined(ARDUINO_AVR_UNO_WIFI_REV2)
	#define SerialHCI Serial2
	#elif defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_NANO_RP2040_CONNECT)
	// SerialHCI is already defined in the variant
	#elif defined(ARDUINO_PORTENTA_H7_M4)
	// SerialHCI is already defined in the variant
	#elif defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_NICLA_VISION)
	#define SerialHCI Serial2
	#elif defined(ARDUINO_OPTA)
	#define SerialHCI Serial3
	#elif defined(ARDUINO_PORTENTA_C33)
	#define SerialHCI Serial5
	#elif defined(ARDUINO_GIGA)
	arduino::UART SerialHCI(CYBSP_BT_UART_TX, CYBSP_BT_UART_RX, CYBSP_BT_UART_RTS, CYBSP_BT_UART_CTS);
	#else
	#error "Unsupported board selected!"
	#endif

Example:

// Line 38~
#elif defined(SerialBLE)
#define SerialHCI SerialBLE
#else
#error "..."
#endif

SerialBLE is user-defined macro.
Define in sketch file.

// Sketch
#define SerialBLE Serial2

void setup() {}
void loop() {}

Alternatively, you may specify SerialHCI directly from sketch file without using a user-defined macro.

// Line 38~
#elif defined(SerialHCI)
// Already defined by user.
#else
#error "..."
#endif

// Sketch
# define SerialHCI Serial2

void setup() {}
void loop() {}