feat: show number of retrieved measurements

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

@@ -176,7 +176,6 @@ class KirbyDevice(
     override var hasRunningOp: Boolean = false
 
     override var rssi: Int? = null
-    
 
     private fun addMeasurement(characteristic: BluetoothGattCharacteristic) {
         if (characteristic.service.uuid == DEMO_SERVICE_UUID && characteristic.uuid == DEMO_CHAR_UUID) {
@@ -211,7 +210,21 @@ class KirbyDevice(
             return emptyList()
         }
         val latest = measurements.last()
-        return demoPayloadToMeasurements(latest)
+        val result = mutableListOf<Measurement>(object : Measurement {
+            override fun getLabel(): String {
+                return "Index"
+            }
+
+            override fun getIcon(): Int {
+                return R.drawable.baseline_numbers_24
+            }
+
+            override fun getFormattedValue(): String {
+                return measurements.size.toString()
+            }
+        })
+        result.addAll(demoPayloadToMeasurements(latest))
+        return result
     }
 
     override fun getActions(): List<Action> {