Abeeway LoRaWAN tracker leaving a network and then coming back... what Join behavior to expect?

Abeeway LoRaWAN tracker leaving a network and then coming back... what Join behavior to expect?

What happens when an Abeeway tracker gets out-of-range of a LoRaWAN network for a long time (or the network fails for an extended time) ? How does the tracker find-out that it has become isolated, and how does it attempt to reconnect ?