diff --git a/ttnhabbridge/src/test/java/nl/sikken/bertrik/hab/lorawan/HeliumUplinkMessageTest.java b/ttnhabbridge/src/test/java/nl/sikken/bertrik/hab/lorawan/HeliumUplinkMessageTest.java
index 3196d5a..65f4b71 100644
--- a/ttnhabbridge/src/test/java/nl/sikken/bertrik/hab/lorawan/HeliumUplinkMessageTest.java
+++ b/ttnhabbridge/src/test/java/nl/sikken/bertrik/hab/lorawan/HeliumUplinkMessageTest.java
@@ -2,6 +2,7 @@ package nl.sikken.bertrik.hab.lorawan;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.time.Instant;
 
 import org.junit.Assert;
 import org.junit.Test;
@@ -14,27 +15,37 @@ public final class HeliumUplinkMessageTest {
 
     @Test
     public void testDecode() throws IOException {
+        HeliumUplinkMessage helium;
+
         // decode JSON
         try (InputStream is = this.getClass().getResourceAsStream("/helium_uplink.json")) {
             ObjectMapper mapper = new ObjectMapper();
-            HeliumUplinkMessage uplink = mapper.readValue(is, HeliumUplinkMessage.class);
-            Assert.assertNotNull(uplink);
-
-            Assert.assertEquals("6081F9D16837130E", uplink.appEui);
-            Assert.assertEquals(0, uplink.fcnt);
-            Assert.assertEquals("kissmapper", uplink.name);
-            Assert.assertEquals(1, uplink.port);
-            Assert.assertEquals(1631457565832L, uplink.reportedAt);
-            Assert.assertArrayEquals(new byte[] { 3 }, uplink.payload);
-
-            HotSpot hotSpot = uplink.hotSpots.get(0);
-            Assert.assertEquals(52.01745, hotSpot.latitude, 0.00001);
-            Assert.assertEquals(4.729876, hotSpot.longitude, 0.00001);
-            Assert.assertEquals("melted-quartz-antelope", hotSpot.name);
-            Assert.assertEquals(-120, hotSpot.rssi, 0.1);
-            Assert.assertEquals(-7.5, hotSpot.snr, 0.1);
+            helium = mapper.readValue(is, HeliumUplinkMessage.class);
         }
+        Assert.assertNotNull(helium);
 
+        Assert.assertEquals("6081F9D16837130E", helium.appEui);
+        Assert.assertEquals(0, helium.fcnt);
+        Assert.assertEquals("kissmapper", helium.name);
+        Assert.assertEquals(1, helium.port);
+        Assert.assertEquals(1631457565832L, helium.reportedAt);
+        Assert.assertArrayEquals(new byte[] { 3 }, helium.payload);
+
+        HotSpot hotSpot = helium.hotSpots.get(0);
+        Assert.assertEquals(52.01745, hotSpot.latitude, 0.00001);
+        Assert.assertEquals(4.729876, hotSpot.longitude, 0.00001);
+        Assert.assertEquals("melted-quartz-antelope", hotSpot.name);
+        Assert.assertEquals(-120, hotSpot.rssi, 0.1);
+        Assert.assertEquals(-7.5, hotSpot.snr, 0.1);
+        
+        // decode to LoRaWAN message
+        LoraWanUplinkMessage lorawan = helium.toUplinkMessage();
+        Assert.assertEquals(Instant.parse("2021-09-12T14:39:25.832Z"), lorawan.getTime());
+        Assert.assertEquals("6081F9D16837130E", lorawan.getAppId());
+        Assert.assertEquals("kissmapper", lorawan.getDevId());
+        Assert.assertEquals(0, lorawan.getCounter());
+        Assert.assertEquals(1, lorawan.getPort());
+        Assert.assertArrayEquals(new byte[] {3}, lorawan.getPayloadRaw());
     }
 
 }