diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
index 0ef19aa5f..84b172cae 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
@@ -307,6 +307,7 @@ public class MQTTUtils extends Thread implements IMqttActionListener, MqttCallba
                 params.put( "vers", Build.VERSION.RELEASE );
                 params.put( "vrntCode", BuildConfig.VARIANT_CODE );
                 params.put( "vrntName", BuildConfig.VARIANT_NAME );
+                params.put( "dbg", BuildConfig.DEBUG );
                 params.put( "myNow", now );
 
                 String fcmid = FBMService.getFCMDevID( mContext );