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Source:https://wiki.teltonika-gps.com/view/EYE_SENSOR_/_BTSMP1#Protocol_description
Source:https://wiki.teltonika-gps.com/view/EYE_SENSOR_/_BTSMP1#Protocol_description
==== Which data TX Power (29th byte) provide? ====
The power is Byte 29 of iBeacon protocol. Before firmware version 1.2.4 this byte was providing the data about configured TX value and was the same number as in the configuration of the sensor. From version 1.2.4 the changes were implemented and now this byte provides measured transmission Power in dBm at 1 or 0 meters from the beacon data, which is basically a calibration. These changes were made because the only way to estimate the distance to a beacon is based on measuring its signal strength. However, the Received Signal Strength Indicator (RSSI) value alone does not mean anything, because beacons can broadcast their advertising packets with different TX power. For example, a smartphone should report RSSIs in different ranges for two beacons located at the same distance from a user, but broadcasting with different TX power levels. To address this issue beacon advertising packets, in addition to payload with identifiers, also broadcast reference RSSI values were introduced. For iBeacon it's the RSSI at 1 meter and for Eddystone it's the RSSI at 0 meters. This way an application that tries to estimate a distance to a beacon knows what RSSI it should receive at a certain distance to a beacon. Then, using it together with the actual RSSI, apps can extrapolate a possible distance to a beacon
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