         }
         else {
             radio.read(&recvByte, 1);
-            Serial.print("Received ack byte " + recvByte);
+            Serial.print("Received ack byte ");
+            Serial.println((int)recvByte);
         }
     }
     else {

    }
    else if (millis() - lastHeartbeat >= HEARTBEAT_THRESH_MILLIS) {
        // Re-use ack byte for heartbeat
        validateAck(sendByte(triggerVal));
    }

    digitalWrite(heartbeatLEDPin, isCommHealthy);

Switch triggerButton = Switch(triggerButtonPin);
Switch resetButton = Switch(resetButtonPin);

uint8_t heartbeatLEDPin = 4;

unsigned long lastHeartbeat = 0;
bool isCommHealthy = false;
