ESPEasy runs out of memory when making too many connections.

[psy0rz]

Steps to reproduce

• Add a controler like C001 (domoticz http)
• set messagedelay to 0
• add a device that reports every second.
• make sure the server does not honor the 'Connection: close' header, for example use nc:
  nc -k -l -v 8383

keep in mind this problem only occurs if we take the initiative to disconnect before the server does.

Expected behavior

Should make a new connection every second and close it without leaking memory.

Actual behavior

Everytime a new connection is started it leaks a bit of mem.

Actually a feature of wifi client is causing the problem: esp8266/Arduino#1923

[psy0rz]

looked for a long time in the core-libraries to find a clean non-hackish way to do this, but couldnt find it.

so we just do this for now:

  while(tcp_tw_pcbs!=NULL)
  {
    tcp_abort(tcp_tw_pcbs);
  }