Sending temperature readings from the TG-BT5-OUT tag to ThingsBoard

Introduction

Our TG-BT5-OUT Bluetooth tag model has a temperature sensor built in. This means that it can be used to measure the surrounding temperature.

The temperature's value is "written" into the advertising payload that the tag is going to broadcast over Bluetooth advertising channels. Based on how you configure the tag, the tag can broadcast the payload periodically or/and when a trigger is detected. You can find more information about the tag's configuration options in iOS and Android Beacon Manager guides.

You can see/display the payloads using our KNOT model under IoT>Bluetooth>Advertising reports tab:

The payloads will be shown in the "Advertisement (hex)" field and they will be in the hexadecimal format.

When the tag is configured in the MikroTik format, the payload's 14th and 15th octets indicate the temperature that was "sensed" at the moment of the broadcast:

All multi-byte values are in little-endian. Meaning, if, for example, you want to get the temperature value and #14 and #15 octets indicate the temperature as "a1 19" → the real temperature value is going to be (0x19a1)/256 = 25.6 C.