Recommended TX power levels for transmission power of the advertising packet.
Advertise using high TX power level (1 dBm). This corresponds to largest visibility range of the advertising packet.
Advertise using low TX power level (-15 dBm).
Advertise using medium TX power level (-7 dBm).
Advertise using the lowest transmission (TX) power level (-21 dBm). Low transmission power can be used to restrict the visibility range of advertising packets.