diff --git a/src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java b/src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java
index 682ea6151..dc8589999 100644
--- a/src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java
+++ b/src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java
@@ -74,7 +74,9 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
   private DcMsg dcAppMsg;
   private String baseURL;
   private String sourceCodeUrl = "";
-  private String selfAddr = "";
+  private String selfAddr;
+  private int sendUpdateMaxSize;
+  private int sendUpdateInterval;
   private boolean internetAccess = false;
   private boolean hideActionBar = false;
 
@@ -199,7 +201,9 @@ public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathC
 
     final JSONObject info = this.dcAppMsg.getWebxdcInfo();
     internetAccess = JsonUtils.optBoolean(info, "internet_access");
-    selfAddr = JsonUtils.optString(info, "self_addr");
+    selfAddr = info.optString("self_addr");
+    sendUpdateMaxSize = info.optInt("send_update_max_size");
+    sendUpdateInterval = info.optInt("send_update_interval");
 
     toggleFakeProxy(!internetAccess);
 
@@ -494,6 +498,16 @@ private void leaveRealtimeChannel() {
   }
 
   class InternalJSApi {
+    @JavascriptInterface
+    public int sendUpdateMaxSize() {
+      return WebxdcActivity.this.sendUpdateMaxSize;
+    }
+
+    @JavascriptInterface
+    public int sendUpdateInterval() {
+      return WebxdcActivity.this.sendUpdateInterval;
+    }
+
     @JavascriptInterface
     public String selfAddr() {
       return WebxdcActivity.this.selfAddr;
diff --git a/src/main/res/raw/webxdc.js b/src/main/res/raw/webxdc.js
index 921597bd3..a68bdda8e 100644
--- a/src/main/res/raw/webxdc.js
+++ b/src/main/res/raw/webxdc.js
@@ -42,6 +42,10 @@ window.webxdc = (() => {
   }
 
   return {
+    sendUpdateMaxSize: InternalJSApi.sendUpdateMaxSize(),
+
+    sendUpdateInterval: InternalJSApi.sendUpdateInterval(),
+
     selfAddr: InternalJSApi.selfAddr(),
 
     selfName: InternalJSApi.selfName(),