Timeout in CC3000 driver

When an interval gets forcibly cleared like that, how can one detect that and react appropriately?

Good point. There's not an easy way right now until exceptions get implemented - however the best bet at the moment is something like:

setInterval(function() {
 ...
 wifiSuccess = false;
 setTimeout(function() {
  // initialise WLAN
  wifiSuccess = true;
 }, 10);
 setTimeout(function() {
  if (!wifiSuccess) { ... }
 }, 1000);
, 60000);

If there's an error in wlan.connect, the error flag will be set and execution will stop - so wifiSuccess will never get set to true.