Making FTP client with socket in Flutter - flutter

Question

i'm making an FTP connection with sockets.
Everything works without TLS but when i start PASV in TLS mode, i can connect to data socket but i can't listen nothing.
Could someone help me to understand where i'm wrong?
This is the code i'm using:
String? pasvIP;
int? pasvPort;
RawSocket rawsock = await RawSocket.connect(ftpHost!, int.parse(port));
StreamSubscription<RawSocketEvent> rwlisten = rawsock.listen((event) {
if (event == RawSocketEvent.read) {
Uint8List? buffer = rawsock.read();
String result = String.fromCharCodes(buffer!);
print(' ${result}');
}
});
rawsock.write(Utf8Codec().encode('AUTH TLS\r\n'));
rawsock = await RawSecureSocket.secure(
rawsock,
onBadCertificate: (certificate) => true,
subscription: rwlisten,
);
rwlisten = rawsock.listen((event) {
if (event == RawSocketEvent.read) {
Uint8List? buffer = rawsock.read();
String result = String.fromCharCodes(buffer!);
print('${result}');
if (result.startsWith('227')) {
final startIndex = result.indexOf('(');
final endIndex = result.indexOf(')');
String ipPasv = result.substring(startIndex + 1, endIndex);
List ipPasvList = ipPasv.split(',');
pasvIP =
'${ipPasvList[0]}.${ipPasvList[1]}.${ipPasvList[2]}.${ipPasvList[3]}';
pasvPort =
(int.parse(ipPasvList[4]) * 256 + int.parse(ipPasvList[5]));
}
}
});
rawsock.write(Utf8Codec().encode('PBSZ 0\r\n'));
rawsock.write(Utf8Codec().encode('PROT P\r\n'));
rawsock.write(Utf8Codec().encode('USER ${username}\r\n'));
rawsock.write(
Utf8Codec().encode('PASS ${activeUser!.decrypt(password!)}\r\n'));
rawsock.write(Utf8Codec().encode('PASV\r\n'));
SecureSocket sockData = await SecureSocket.connect(
pasvIP!,
pasvPort!,
onBadCertificate: (certificate) => true,
);
sockData.listen(
(data) { // <-- NO DATA HERE
final serverResponse = String.fromCharCodes(data);
print('$serverResponse');
},
onError: (error) {
print(error);
sockData.destroy();
},
onDone: () {
print('Server left.');
sockData.destroy();
},
);
rawsock.write(Utf8Codec().encode('LIST\r\n'));
rawsock.write(Utf8Codec().encode('QUIT\r\n'));
Thanks
Marco