问无法从套接字响应读取换行/回车

EN

Trying 1.2.3.4...
Connected to 1.2.3.4.
Escape character is '^]'.
*HELLO*$$$
CMD
factory RESET
factory RESET

Set Factory Defaults
<4.00> set sys autoconn 0
set sys autoconn 0

AOK
<4.00>
...

socket_write($socket, "factory RESET\r"); // send command
$response = socket_read($socket, 256); // get response

factory RESET

Set Factory Defaults

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// ...
bw.write("factory RESET");
bw.newLine();
bw.flush();
// ...
StringBuilder sb = new StringBuilder();

String s;
while ((s = br.readLine()) != null) {
   sb.append(s);
}

char[] buffer = new char[256];
br.read(buffer, 0, 256);
String response = new String(buffer); // response is "factory RESET"