handle packet not 41 length

[pwldp]

txPower is evaluated properly not only for 41 packet length

[EricSyr]

# commented out - don't know what this byte is. It's NOT TXPower txpower, = struct.unpack("b", pkt[report_pkt_offset -2]) print "\t(Unknown):", txpower
This appears to be the TxPower of the BLE Beacon, maybe its used as a reference for distance calculation, the Central device can know the TxPower of the peripheral.

[gilvad]

it's not tx power, it's perceived signal strength measured at 1 meter distance.
This is used to estimate distance based on RSSI value.