Minihub pro gateway from Browan

Hi to all
I start use Minihub pro gateway from Browan (same as from Seeedstudio, TTN …). The gateaway is connected to TTN and test LOra Node is connected as well. Communication works. Node sends test data and receive acknowledge from TTN via gateway. Via MQTT i receive all data stream on my Nodered app. OK. MY question is what can i do to use data when internet is down and gateway in not connected? Is there way to receive send data from Lora node device? Or can gateway works locally?