Close Socket

[MorseIot]

According to the sample code below, sending packet to a host on a given port, if socket error occurs, depending on the code, the socket will be closed and returns None. But when resending, always returns socket error, something wrong ???

Code: Select all

def openSocket(host,port,send,buffer):
        try:
	    _socket = socket.socket()
            _socketAddr = socket.getaddrinfo(host, port)[0][-1]
            _socket.connect(_socketAddr)
            if port is 443:
                _socket = ssl.wrap_socket(_socket)
            _socket.settimeout(timeout)
            _socket.setblocking(False)
            _socket.send(send)
            responseBytes = _socket.recv(buffer)
        except:
            print('Socket Except Error')
            responseBytes = None
            pass
        finally:
            close()
            print('Socket Closed Finally')
        return responseBytes

def close()
    _socket.close() 

#Exit only recv is not None
responseBytes = None
While responseBytes is not None:
   openSocket(xxxxx,80,'xxxxxxx',512)

[pythoncoder]

You have made your code hard to debug by trapping all exceptions and issuing a generic message. I would suggest at the very least getting it to issue something more meaningful so you can figure out why it's failing

Code: Select all

        except Exception as e:
            print('Socket Except Error', e)
            responseBytes = None
#            pass  This line has no purpose as far as I can see

Or, for test purposes,

Code: Select all

        except:
            #print('Socket Except Error')
            raise
            responseBytes = None
 

Then you'll get a full traceback with the failing line number.

[MorseIot]

You have made your code hard to debug by trapping all exceptions and issuing a generic message. I would suggest at the very least getting it to issue something more meaningful so you can figure out why it's failing

Code: Select all

        except Exception as e:
            print('Socket Except Error', e)
            responseBytes = None
#            pass  This line has no purpose as far as I can see

Or, for test purposes,

Code: Select all

        except:
            #print('Socket Except Error')
            raise
            responseBytes = None
 

Then you'll get a full traceback with the failing line number.

When using raise in except, the error happens after some time OSError: [Errno 103] ECONNABORTED relative to the line of code _socket.connect (_socketAddr).

I have not found a solution so far for this error

[pythoncoder]

I think this means that the other endpoint is rejecting the connection.

I notice you're using a nonblocking socket. This raises at least two issues. As I understand it, SSL/TLS on nonblocking sockets is a very recent addition to MicroPython. It may or may not have issues.

Secondly you can't just send and receive from a nonblocking socket as the methods guarantee to return immediately regardless of how much of the data was sent or received. There may well be a shortfall. You have to monitor this, repeating any partially complete operations until all the data has been handled. There are numerous examples on the web. There is MicroPython code in this file - see the _as_read and _as_write methods.

[MorseIot]

I think this means that the other endpoint is rejecting the connection.

I notice you're using a nonblocking socket. This raises at least two issues. As I understand it, SSL/TLS on nonblocking sockets is a very recent addition to MicroPython. It may or may not have issues.

Secondly you can't just send and receive from a nonblocking socket as the methods guarantee to return immediately regardless of how much of the data was sent or received. There may well be a shortfall. You have to monitor this, repeating any partially complete operations until all the data has been handled. There are numerous examples on the web. There is MicroPython code in this file - see the _as_read and _as_write methods.

Okay, I'll read and test this solution.
Thanks