From c13eaaba4c8a4145feb022557de9bb6e772f5f07 Mon Sep 17 00:00:00 2001
From: Ryan Summers <ryan.summers@vertigo-designs.com>
Date: Tue, 2 Mar 2021 17:16:40 +0100
Subject: [PATCH] Restoring sleep semantics

---
 src/bin/dual-iir.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/bin/dual-iir.rs b/src/bin/dual-iir.rs
index e5ff197..391b127 100644
--- a/src/bin/dual-iir.rs
+++ b/src/bin/dual-iir.rs
@@ -139,8 +139,8 @@ const APP: () = {
         let clock = c.resources.clock;
 
         loop {
-            let _sleep = c.resources.mqtt_interface.lock(|interface| {
-                !interface.network_stack().poll(clock.current_ms())
+            let sleep = c.resources.mqtt_interface.lock(|interface| {
+                interface.network_stack().poll(clock.current_ms())
             });
 
             if c.resources
@@ -149,6 +149,10 @@ const APP: () = {
             {
                 c.spawn.settings_update().unwrap()
             }
+
+            if sleep {
+                cortex_m::asm::wfi();
+            }
         }
     }