Closed sockets should still be read til the end of data

[ctron]

When the ESP sends a close notification for a socket, that socket may still have data in its buffer.

However, when reading, we check for the "close" state first. So you are unable to read the remaining data.

To my understanding it may also be the case that the ESP sends out a close notification, still holding data for that socket. So we may have the additional issue of reading data from a socket we know that is closed, but need to drain the ESP's socket buffer.