sanitize sensor values

src/main.cpp

@@ -227,15 +227,19 @@ void ICACHE_FLASH_ATTR sendValues() {
     root["radioactivity"] = sd.radioactivity;
   }
 
-  JsonObject& voltageObject = array.createNestedObject();
-  voltageObject["sensor"] = SENSOR7_ID;
-  voltageObject["value"] = sd.voltage;
-  root["voltage"] = sd.voltage;
-
-  JsonObject& rssiObject = array.createNestedObject();
-  rssiObject["sensor"] = SENSOR8_ID;
-  rssiObject["value"] = sd.rssi;
-  root["rssi"] = sd.rssi;
+  if (sd.voltage > 2.5 ) {
+    JsonObject& voltageObject = array.createNestedObject();
+    voltageObject["sensor"] = SENSOR7_ID;
+    voltageObject["value"] = sd.voltage;
+    root["voltage"] = sd.voltage;
+  }
+
+  if (sd.rssi != 0) {
+    JsonObject& rssiObject = array.createNestedObject();
+    rssiObject["sensor"] = SENSOR8_ID;
+    rssiObject["value"] = sd.rssi;
+    root["rssi"] = sd.rssi;
+  }
 
   root["millis"] = millis();
   root["heap"] = ESP.getFreeHeap();