Send webpage config in multiple parts

Change-Id: I87b90ea5ec498e93647bb04012a51f687c05a4a0
diff --git a/aos/network/www/config_handler.ts b/aos/network/www/config_handler.ts
index 6615f39..048c2ba 100644
--- a/aos/network/www/config_handler.ts
+++ b/aos/network/www/config_handler.ts
@@ -27,7 +27,7 @@
   }
 
   printConfig() {
-    for (const i = 0; i < this.config.channelsLength(); i++) {
+    for (let i = 0; i < this.config.channelsLength(); i++) {
       const channel_div = document.createElement('div');
       channel_div.classList.add('channel');
       this.tree_div.appendChild(channel_div);