ping method
Implementation
Future<int> ping(int port, String testingUrl) async {
final urlPtr = StringUtf8Pointer(testingUrl).toNativeUtf8();
final _ping = _pingPtr.asFunction<_PingDart>();
try {
final result = _getTransferResponseData(
await Isolate.run(() => _ping(port, urlPtr)),
);
return int.parse(result);
} finally {
calloc.free(urlPtr);
}
}