From be6f3599e2d3ed09a24650531cf5440c6e48b460 Mon Sep 17 00:00:00 2001
From: Kevin Le <vinhdat82@gmail.com>
Date: Fri, 14 Aug 2026 22:15:13 +0700
Subject: [PATCH] PowerSaving for room servers

---
 examples/simple_room_server/MyMesh.cpp |  5 +++++
 examples/simple_room_server/MyMesh.h   |  3 +++
 examples/simple_room_server/main.cpp   | 10 ++++++++++
 3 files changed, 18 insertions(+)

diff --git a/examples/simple_room_server/MyMesh.cpp b/examples/simple_room_server/MyMesh.cpp
index 546d094f..53e7d697 100644
--- a/examples/simple_room_server/MyMesh.cpp
+++ b/examples/simple_room_server/MyMesh.cpp
@@ -1077,3 +1077,8 @@ void MyMesh::loop() {
   uptime_millis += now - last_millis;
   last_millis = now;
 }
+
+// To check if there is pending work
+bool MyMesh::hasPendingWork() const {
+  return _mgr->getOutboundTotal() > 0;
+}
diff --git a/examples/simple_room_server/MyMesh.h b/examples/simple_room_server/MyMesh.h
index 5cf949c6..0af82bdb 100644
--- a/examples/simple_room_server/MyMesh.h
+++ b/examples/simple_room_server/MyMesh.h
@@ -229,4 +229,7 @@ public:
   void clearStats() override;
   void handleCommand(uint32_t sender_timestamp, char* command, char* reply);
   void loop();
+
+  // To check if there is pending work
+  bool hasPendingWork() const;
 };
diff --git a/examples/simple_room_server/main.cpp b/examples/simple_room_server/main.cpp
index d833fff3..804fc214 100644
--- a/examples/simple_room_server/main.cpp
+++ b/examples/simple_room_server/main.cpp
@@ -157,4 +157,14 @@ void loop() {
 #ifdef HAS_EXTERNAL_WATCHDOG
   external_watchdog.loop();
 #endif
+
+  if (the_mesh.getNodePrefs()->powersaving_enabled && !the_mesh.hasPendingWork()) {
+#if defined(NRF52_PLATFORM)
+    board.sleep(0); // nrf ignores seconds param, sleeps whenever possible
+#else
+    if (the_mesh.millisHasNowPassed(POWERSAVING_FIRSTSLEEP_SECS * 1000)) { // To check if it is time to sleep
+      board.sleep(30); // Sleep. Wake up after a while or when receiving a LoRa packet
+    }
+#endif
+  }
 }