Ruuvitag BLE integration

[admin]

Use this to handle negative temperature correctly:

Code:

temperature = data:byte(10)
decimals = data:byte(11) / 100

if bit.band(temperature, 0x80) == 0x80 then
  temperature = -bit.band(temperature, 0x7F)
  temperature = temperature - decimals
else
  temperature = temperature + decimals
end