Send packets to Source Dedicated Server - node.js

Question

I'm trying to write an RCON Client in dart, but I'm getting stuck at this point:
The server recives the packet but seems like it cannot read it properly as reply I'm getting:
Rcon auth failed from rcon whitelist address 2.xxx.xxx.169:52672
Even tough the password is right:
"rcon_password" = "foo" ( def. "" ) - remote console password.
I've provided links to the valve's wiki within the code comments.
This is my code at the moment:
Socket socket;
int _id = 1;
const int SERVERDATA_AUTH = 3;
const int SERVERDATA_AUTH_RESPONSE = 2;
const int SERVERDATA_EXECCOMMAND = 2;
const int SERVERDATA_RESPONSE_VALUE = 0;
void main() async {
socket = await Socket.connect('hexah.net', 27015);
await socket.listen(onSocketData, onError: onError, onDone: onDone);
await _write(SERVERDATA_AUTH, 'foo');
}
void _write(int type, String body) async {
var bodyASCII = ascii.encode(body); //Get ASCII string with Null terminator
// Should I use this or the other way? ??
var size = bodyASCII.length + 14;
var buffer = new Int8List(size).buffer;
var bdata = new ByteData.view(buffer);
bdata.setInt32(0, size - 4, Endian.little); //Byte requests length (32bit le signed int).
bdata.setInt32(4, _id, Endian.little); //Any integer (32bit le signed int).
bdata.setInt32(8, type, Endian.little); //Valid values: SERVERDATA_* (32bit le signed int).
int writepos = 12;
await bodyASCII.forEach((element) {
bdata.setInt8(writepos, element);
writepos +=1;
});
bdata.setInt16(size-2, 0, Endian.little); //Write the null terminators
await socket.write(bdata);
_id++;
}
void onSocketData(var data){
print(data);
}
void onError(var data, StackTrace stack){
print(stack);
}
void onDone(){
print('Connection terminated');
}
Here is also a small example with nodejs:
var size = Buffer.byteLength(body) + 14,
buffer = new Buffer(size);
buffer.writeInt32LE(size - 4, 0);
buffer.writeInt32LE(id, 4);
buffer.writeInt32LE(type, 8);
buffer.write(body, 12, size - 2, "ascii");
buffer.writeInt16LE(0, size - 2);
Do you have any ideas?
especially about getting properly the lengths.
This is how the packet payload should be
Using a RawSocket I get this as reply:
RawSocketEvent.write
RawSocketEvent.readClosed
EDIT:
I'm seeing that the same packet sent from nodejs resulted in a successful authentication but Dart failes, any ideas why this is happening? (converting the packets from nodejs & dart to an array they resulted the same)

Answer 1

Solved!
The issue was that I had to use a RawSocket and write something like this:
var packet = bdata.buffer.asInt8List();
await socket.write(packet, 0, packet.length);