fix: do not forward invalid payloads

app/src/main/java/com/example/sensortestingapp/KirbyDevice.kt

@@ -129,11 +129,23 @@ class KirbyDevice(
 
     private fun addMeasurement(characteristic: BluetoothGattCharacteristic) {
         val hexPayload = characteristic.value.toHexString().substring(2)
-        val payload = Payload(hexPayload)
+        val measurement = DecoderIaq.parseMeasurement(hexPayload)
-        val base64Payload = Base64.getEncoder().encodeToString(characteristic.value)
+        var payload : Payload
-        Log.i("BleListener", "Char received: $payload")
+        if (measurement == null) {
+            payload = Payload(hexPayload)
+        } else {
+            payload = Payload(measurement.toString())
+            Log.i("BleListener", "Char received: $payload")
+            val base64Payload = Base64.getEncoder().encodeToString(characteristic.value)
+            publishMeasurement(base64Payload)
+        }
+
         measurements.add(payload)
-        publishMeasurement(base64Payload)
+
+        if (measurements.size > maxMeasurements) {
+            measurements.removeFirst()
+        }
+
     }
 
     private fun publishMeasurement(payload: String) {
@@ -163,6 +175,7 @@ class KirbyDevice(
     }
 
     private val measurements = ArrayList<Payload>()
+    private val maxMeasurements = 20
 
     private val statuses = EnumSet.noneOf(DeviceStatus::class.java)
 
@@ -362,11 +375,7 @@ private fun payloadToMeasurements(payload: Payload): List<Measurement> {
         }
 
         override fun getFormattedValue(): String {
-            val measurement = DecoderIaq.parseMeasurement(payload.payload)
+            return payload.payload
-            if(measurement == null) {
-                return payload.payload
-            }
-            return measurement.toString()
         }
 
         override fun getIcon(): Int? {