Reading From Socket Multiple Times - dart

Question

I'm having some trouble writing and reading from a socket multiple times. I'm writing a speed test and I essentially want to write an http request using a socket, which will return garbage data which I then read to test the bandwidth speed. I've made the http request successfully, but I'm unable to flip flop between writing to the socket and then reading the response. I can read the data from the socket's stream once, and then it doesn't seem to have any more data to read even after i've made another request.
The salient part of the code is in the start method where the loop runs:
class DownloadTest {
late Socket socket;
late Stream<Uint8List> dataStream;
bool graceTimeOver = false;
int totalBytesDownloaded = 0;
late DateTime startTime;
final ckSize = 10;
final graceTime = 2;
final dlTime = 5;
final client = HttpClient();
final String _serverAddress;
final void Function(double mbps) onProgress;
DownloadTest({required serverAddress, required this.onProgress})
: _serverAddress = serverAddress;
Future<void> start() async {
await resetTest();
while (true) {
writeDlRequest();
var bytesDownloaded = await downloadData();
print(graceTimeOver);
if (!graceTimeOver) {
checkGraceTime();
} else {
print(bytesDownloaded);
totalBytesDownloaded += bytesDownloaded;
if (testFinished()) {
break;
}
}
}
print('test over');
await socket.close();
}
Future<int> downloadData() async {
var bytes = 0;
await for (var data in dataStream) {
bytes += data.length;
}
return bytes;
}
Future<void> resetTest() async {
socket = await Socket.connect(_serverAddress, 80);
dataStream = socket.asBroadcastStream();
graceTimeOver = false;
startTime = DateTime.now();
totalBytesDownloaded = 0;
}
void checkGraceTime() {
if (!graceTimeOver) {
var elapsedSeconds =
startTime.difference(DateTime.now()).inMilliseconds / 1000;
if (elapsedSeconds >= graceTime) {
graceTimeOver = true;
startTime = DateTime.now();
print('grace time over');
}
}
}
void writeDlRequest() {
socket.write('GET /garbage.php?ckSize=$ckSize HTTP/1.1\r\n');
socket.write('Host: speedtest.somethingsomething.com:80\r\n');
socket.write('Connection: keep-alive\r\n');
socket.write('\r\n');
}
bool testFinished() {
var elapsedSeconds =
startTime.difference(DateTime.now()).inMilliseconds / 1000;
return elapsedSeconds >= dlTime;
}
}
I've made the socket's stream into a broadcast stream so I should be able to listen to it multiple times, but after reading from it the first time, it fails to read any more data and the loop just spins. Any ideas where i'm going wrong?