Remove grp.listener

[admin]

This won't work because each time you call actualizarEstados a new function is created.
If you don't have any other code modifying the listeners array you can simply remove the last listener that has been registered like this:

Code:

function removelistenerlast(addr) {
  var id = Scada.encodeGroupAddress(addr);
  var listeners = objectStore.listeners[ id ] || [];
  listeners.pop();
}