@audorva Well, that's not too easy to answer. If you got a good rssi (singal strength) but much noise (low snr), you won't receive anything. Same if you got no noise (good snr) but the signal is too low (bad rssi). You can look at the link budget for a hint.
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Hello, RAK811 Tracker program is open source, if you do not want to use LoRaWAN sensor data transmission, then you can get the device data obtained through the serial port or I2C way to send to other devices, these you can program.