diff --git a/src/c3nav/mesh/consumers.py b/src/c3nav/mesh/consumers.py
index ecd4c869..9464074b 100644
--- a/src/c3nav/mesh/consumers.py
+++ b/src/c3nav/mesh/consumers.py
@@ -379,7 +379,7 @@ class MeshConsumer(AsyncWebsocketConsumer):
         async with self.ota_chunks_available_condition:
             num_chunks = (update.build.binary.size-1)//OTA_CHUNK_SIZE+1
             print('queueing chunks for update', update.id, 'num_chunks=%d' % num_chunks, "chunks:", chunks)
-            chunks = set(range(num_chunks*0+2)) if chunks is None else {chunk for chunk in chunks if chunk < num_chunks}
+            chunks = set(range(num_chunks)) if chunks is None else {chunk for chunk in chunks if chunk < num_chunks}
             self.ota_chunks.setdefault(update.id, set()).update(chunks)
             self.ota_chunks_available_condition.notify_all()
 
@@ -404,7 +404,6 @@ class MeshConsumer(AsyncWebsocketConsumer):
                     continue
 
                 # send the message
-                print("sending", update_id, "chunk", chunk)
                 with self.ota_states[recipients[0]].recipient.update.build.binary.open('rb') as f:
                     f.seek(chunk * OTA_CHUNK_SIZE)
                     data = f.read(OTA_CHUNK_SIZE)
@@ -417,7 +416,7 @@ class MeshConsumer(AsyncWebsocketConsumer):
                 ))
 
                 # wait a bit until we send more
-                await asyncio.sleep(1)
+                await asyncio.sleep(0.1)  # 100ms
 
             async with self.ota_chunks_available_condition:
                 if not self.ota_chunks: