diff --git a/php/schedule.php b/php/schedule.php
index 4789a61..078b679 100644
--- a/php/schedule.php
+++ b/php/schedule.php
@@ -1,5 +1,11 @@
 <?php
 
+$roomMapping = [
+];
+
+$passThroughMapping = [
+];
+
 include_once("monoformat_schema.php");
 include_once("monoformat_structured.php");
 
@@ -23,8 +29,27 @@ function replaceTalkInfo($str, $talks) {
     }, $str);
 }
 
-$roomMapping = [
-];
+if (isset($_GET["mac"]) and array_key_exists($_GET["mac"], $passThroughMapping)) {
+    $fn = $passThroughMapping[$_GET["mac"]];
+    if (is_dir($fn)) {
+        $d = opendir($fn);
+        $files = [];
+        while (($e = readdir($d)) !== false) {
+            if (str_ends_with($e, ".bin")) {
+                array_push($files, $fn . "/" . $e);
+            }
+        }
+        sort($files);
+        if (!count($files)) {
+            die("No files found");
+        }
+        $n = (time() / 60) % count($files);
+        $fn = $files[$n];
+    }
+    Header("Content-Type: application/octet-stream");
+    readfile($fn);
+    exit(0);
+}
 
 if (!isset($_GET["mac"]) or !array_key_exists($_GET["mac"], $roomMapping)) {
     /* We didn't find this device in the mapping, so let's just