1 files changed, 17 insertions, 5 deletions
diff --git a/src/org/traccar/protocol/OwnTracksProtocolDecoder.java b/src/org/traccar/protocol/OwnTracksProtocolDecoder.java
index f664d113b..ea604f4ac 100644
--- a/src/org/traccar/protocol/OwnTracksProtocolDecoder.java
+++ b/src/org/traccar/protocol/OwnTracksProtocolDecoder.java
@@ -58,6 +58,11 @@ public class OwnTracksProtocolDecoder extends BaseProtocolDecoder {
         JsonObject root = Json.createReader(
                 new StringReader(request.getContent().toString(StandardCharsets.US_ASCII))).readObject();
 
+        if (!root.containsKey("_type") || !root.getString("_type").equals("location")) {
+            sendResponse(channel, HttpResponseStatus.BAD_REQUEST);
+            return null;
+        }
+
         Position position = new Position();
         position.setProtocol(getProtocolName());
         position.setValid(true);
@@ -83,13 +88,21 @@ public class OwnTracksProtocolDecoder extends BaseProtocolDecoder {
         if (root.containsKey("batt")) {
             position.set(Position.KEY_BATTERY, root.getInt("batt"));
         }
-        if (root.containsKey("topic")) {
-            position.set("topic", root.getString("topic"));
-        }
 
         position.setTime(new Date(root.getJsonNumber("tst").longValue() * 1000));
 
-        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, root.getString("tid"));
+        String uniqueId;
+
+        if (root.containsKey("topic")) {
+            uniqueId = root.getString("topic");
+            if (root.containsKey("tid")) {
+                position.set("tid", root.getString("tid"));
+            }
+        } else {
+            uniqueId = root.getString("tid");
+        }
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
         if (deviceSession == null) {
             sendResponse(channel, HttpResponseStatus.BAD_REQUEST);
             return null;
@@ -99,5 +112,4 @@ public class OwnTracksProtocolDecoder extends BaseProtocolDecoder {
         sendResponse(channel, HttpResponseStatus.OK);
         return position;
     }
-
 }