fix: skip Bluetooth address and UUID validation on iOS - #4
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On iOS, Bluetooth devices are not identified by MAC addresses like on Android. Instead, iOS assigns its own UUIDs (e.g., A1B2C3D4-E5F6-7890-...) to discovered peripherals.
The original library validates device addresses against a MAC address regex (XX:XX:XX:XX:XX:XX). Since iOS identifiers never match that format, every call to connectToDevice, bondDevice, or writeToDevice throws a BtcAddressException on iOS making the library unusable on that platform.
The same issue applies to _validateUuid, the UUID format iOS provides may not match the regex the library expects.
Adding if (Platform.isIOS) return; skips these Android-specific format checks on iOS and lets the platform channel handle the identifiers natively.
This has been tested using two Bluetooth printers connected to multiple iPhones.