Demo Mode and Timer Mode applies to PMIC used in this kit which supplies power to BLE Module. The standard firmware running in BLE Modules does not have any control over these Modes.
Please refer the Kit guide from below link.
Thanks for coming back to me.
OK understood an alternative question is it possible to change the advertising interval of the timer mode from 5 minutes.
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This Kit powers from a small Solar Cell , where it can not provide a regular power supply to BLE device. If you do not care about the power consumption , you can directly power the BLE device from a battery. The firmware running in BLE device continuously scans the Temp/Humidity sensors and broadcasts data. ( Also, you can program the BLE device as per your requirement , you can download the firmware from that link)