diff --git a/src/bin/dual-iir.rs b/src/bin/dual-iir.rs
index 391b127..00e7d12 100644
--- a/src/bin/dual-iir.rs
+++ b/src/bin/dual-iir.rs
@@ -140,7 +140,7 @@ const APP: () = {
 
         loop {
             let sleep = c.resources.mqtt_interface.lock(|interface| {
-                interface.network_stack().poll(clock.current_ms())
+                !interface.network_stack().poll(clock.current_ms())
             });
 
             if c.resources