Kotlin read variable and post yes or no answer - kotlin

Question

I use Java and Kotlin for personal projects with little experience and I might use your help with this one. What I am trying to do is to read telemetry data (temperature, pressure, light level) from Estimote beacon. I have already managed to put & update values into textviews.
Now I would like to get IF conditions at this point (later I will try to save & upload them to Firebase database). Basically I want to check if one of the telemetry values is higher or less than Double number. Eg. if the light level is below 6 lux, write "Less then 6!", if more "More than 6!"
val scanner = EstimoteBluetoothScannerFactory(applicationContext).getSimpleScanner()
val scanHandler = scanner.estimoteTelemetryFullScan()
.withBalancedPowerMode()
.withOnPacketFoundAction {
var temperature: TextView = findViewById<TextView>(R.id.temperature)
temperature.setText("Temperature: ${it.temperatureInCelsiusDegrees}")
var magnetometer: TextView = findViewById<TextView>(R.id.magnetometer)
magnetometer.setText("Magnetometer: ${it.magnetometer}")
var pressure: TextView = findViewById<TextView>(R.id.pressure)
pressure.setText("Pressure: ${it.pressure}")
var ambientLight: TextView = findViewById<TextView>(R.id.ambientLight)
ambientLight.setText("Ambient Light: ${it.ambientLightInLux}")
var motionState: TextView = findViewById<TextView>(R.id.motionState)
motionState.setText("Motion State: ${it.motionState}")
}
.start()
if(ambientLight > 6) {
var checkLight: TextView = findViewById<TextView>(R.id.checkLight)
checkLight.setText("More than 6!")
}else{
var checkLight: TextView = findViewById<TextView>(R.id.checkLight)
checkLight.setText("Less than 6!")
}
This code does not update the textview value