Codename One - Can't read from socket on real device - ios

Question

I'm developing an iOS app, using Codename One. I extended the SocketConnection class, in order to receive data from a server.
class CustomSocketConnection extends SocketConnection {
private OutputStream os;
private InputStream is;
private InputStreamReader isr;
private String rawMessage;
public CustomSocketConnection(){
os = null;
is = null;
isr = null;
rawMessage = null;
}
public synchronized String getRawMessage(){
return rawMessage;
}
#Override
public void connectionError(int errorCode, String message) {
rawMessage = null;
ToastBar.showErrorMessage("Error Connecting. ErrorCode: " + errorCode + " Message: " + message);
System.out.println(">>>CustomSocketConnection, connectionError. Error Connecting. ErrorCode: " + errorCode + " Message: " + message);
}
#Override
public void connectionEstablished(InputStream is, OutputStream os) {
System.out.println(">>>CustomSocketConnection, connectionEstablished");
char termination = '\n';
int length = 1024;
char[] buffer = new char[length];
byte[] bufferByte = new byte[length];
StringBuilder stringBuilder = new StringBuilder();
System.out.println(">>>CustomSocketConnection, connectionEstablished, prima del while");
try {
InputStreamReader isr = new InputStreamReader(is, "UTF-8");
System.out.println(">>>CustomSocketConnection, connectionEstablished, prima della read");
while(true){
System.out.println(">>>CustomSocketConnection, loop di read, inizio");
int read = isr.read();
System.out.println(">>>CustomSocketConnection, loop di read, subito dopo la read");
char c = (char) read;
if (read == -1) rawMessage = null;
System.out.println(">>>CustomSocketConnection, loop di read, letto: " + c);
while(c != termination){
stringBuilder.append(c);
read = isr.read();
c = (char) read;
if (read == -1) rawMessage = null;
}
rawMessage = stringBuilder.toString();
if(rawMessage != null) doActions(rawMessage);
//System.out.println(">>>CustomSocketConnection, connectionEstablished, ho letto: " + rawMessage + "FINE");
}
}
catch (IOException ex) {
System.out.println(">>>CustomSocketConnection, connectionEstablished, errore: " + ex.getMessage());
}
System.out.println(">>>CustomSocketConnection, connectionEstablished, dopo il while");
}
private void doActions(String msg){
//do something
}
}
In the connectionEstablished method, I read data from server, using the read method of the InputStreamReader class.
If I run the app on the simulator, it works properly and it receives data from server. When I launch the app on real devices (iPad mini, 32-bit device, iOS version 8.1.1 12B435, more details here; iPhone 7s, 64-bit device, iOS version 11.2.5 15D60), the read method doesn't receive data from server. In fact, I can see the string printed by the println before the read method, but I can't see the string printed by the println after the read method.
The issue is not server-side, because I developed an Android app and it receive data from the same server. There aren't firewall restrictions or other network limitations: Android app and the Codename One simulator both receive data when connected on the same local network of the server or from another one.
What's wrong?

Answer 1

Solved using InputStream instead of InputStreamReader.
#Override
public void connectionEstablished(InputStream is, OutputStream os) {
System.out.println(">>>CustomSocketConnection, connectionEstablished");
char termination = '\n';
StringBuilder stringBuilder = new StringBuilder();
System.out.println(">>>CustomSocketConnection, connectionEstablished, prima del while");
try {
System.out.println(">>>CustomSocketConnection, connectionEstablished, prima della read");
while(true){
System.out.println(">>>CustomSocketConnection, loop di read, inizio");
int read = is.read();
System.out.println(">>>CustomSocketConnection, loop di read, subito dopo la read");
char c = (char) read;
if (read == -1) rawMessage = null;
System.out.println(">>>CustomSocketConnection, loop di read, letto: " + c);
while(c != termination){
stringBuilder.append(c);
read = is.read();
c = (char) read;
if (read == -1) rawMessage = null;
}
rawMessage = stringBuilder.toString();
if(rawMessage != null) doActions(rawMessage);
//System.out.println(">>>CustomSocketConnection, connectionEstablished, ho letto: " + rawMessage + "FINE");
}
}
catch (IOException ex) {
System.out.println(">>>CustomSocketConnection, connectionEstablished, errore: " + ex.getMessage());
}
System.out.println(">>>CustomSocketConnection, connectionEstablished, dopo il while");
}
Can anyone explain me why it's working with InputStream?