fileExists method
Checks if a file exists on the Frame device.
Args: path (String): The full path to the file to check.
Returns: Future
Implementation
Future<bool> fileExists(String path) async {
final String? response = await frame.bluetooth.sendString(
'r=frame.file.open("$path","read");print("o");r:close()',
awaitResponse: true,
);
return response == "o";
}