I have deployed one gateway and getting continuous join request from one of the unknown device.
Please find attached image for the same.
Is there any hack i can make in gateway to stop this kind of devices in deployment?
You can configure a filter (Configuration - ChirpStack open-source LoRaWAN<sup>®</sup> Network Server) to only forward OTAA requests for specific JoinEUIs.
Will apply filter as suggested.
That would not reduce actual Traffic in Air for LoRa, but will reduce traffic on backhaul.
Please correct me if i have not understood it correctly.
You are right. You might control how often your devices transmit, but the radio spectrum is shared, so if anybody else has sensors deployed, you will “hear” that traffic, but you wont be able to do anything with it.