Serial library - catch port busy

kasperkamperman

Hi,

I work with a bluetooth serial device and I regularly get the message: Error opening serial port... : Port Busy.

When I retry a few times I can get a connection. Is there a way that I can catch the error in my program itself and retry the connection.

So when this happens I could run something like:

port.clear();
port.stop();
port = new Serial(this, Serial.list()[portNumber], 9600); 
port.clear();  

edi3

Hi, I'm workin with the same thing about connecting the mobile device through bluetooth serial port and I always get the error message just like yours. Error opening serial port...: Port busy.

After I disconnected the bluetooth between my mac and the mobile, the println(Serial.list()); still listed the serial port which should be appeared when connecting. I don't get it. Can you tell me how to solve this problem?

Thanks.

wrzaskun

I have the same problem but only with windows 8, my code working on win 7. I use BT connection but when I restart the sketch I got an error "Port busy" only computer restart helps. So, if anyone know how to release the port on windows 8, please give me a solution. I tried the @kasperkamperman's solution and not working for my case.

alessio31183

Hi wrzaskun, I have the same issue of you as I posted here

Have you solved in some way?

Please if you have suggestions tell me.

Rocks

First check the correct port number you are trying to access and then if problem of port busy persists requiring you to restart, easy way is to uninstall & re-install the device from Windows Device Manager. At least you don't have to restart your computer.

Lord_of_the_Galaxy

Try this, it's just a workaround-

boolean connect(int portNumber, int baudRate, int limit){
  int tries = 0;
  while(tries < limit){
    try{
      port = new Serial(this, Serial.list()[portNumber], baudRate);
    }catch(Exception e){
      System.err.println("Retrying");
      tries++;
      continue;
    }
    break;
  }
  if(tries < limit){
    println("Successful in " + str(tries + 1) + " tries.");
    return true;
  }else{
    System.err.println("Unsucessful. Reached limit.");
    return false;
  }
}