I have connected my devices and gateway with The Things Stack application, but when I disconnected the gateway, my devices are still sending the uplink messages to the TTS application. Does it mean that my devices routing using any other gateway, if yes, how could I be informed from which gateway my devices are routing those uplinks?
Gateway
No. LoRaWAN is not WiFi. It means another gateway that connects to or peers with your TTS instance receives and forwards the uplinks. Any gateway within radio range of your device will receive and forward the uplink to its back-end. Your device just transmits and does not care if there are any receiving gateways within radio range. It does not ‘route’ to any gateway (unlike WiFi).