Paul Thompson

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5 years, 12 months ago.

Can a bind of a socket be unbound due to network/stack activities?

I apologize if this question has been asked and answered, I found it difficult to come up with search terms for this question.

I'm using nonblocking sockets, but to simplify things, in this question, I'll use blocking sockets.

Given a socket that has been successfully bound, e.g. by the following code

Binding a socket

#include "mbed.h"
#include "EthernetInterface.h"
#include "TCPSocket.h"

int main()
{
  EthernetInterface eth;
  nsapi_error_t error;
  eth.connect();

  TCPSocket server;

  server.open(&eth);
  server.bind(eth.get_ip_address(), 23);
  server.listen(1);

  while(1)
  {
    auto socket = server.accept(&error);
    if (socket) { socket->close(); }
  }
}

My question: Is it possible for the bind to be broken without calling server.close()? Is there an error code returned in error that I should pay attention to that would require me to clean up and create a new server socket to re-establish the bind?

Thank you.

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