From 565df7df4a46f1bb965decc51c1225600b699926 Mon Sep 17 00:00:00 2001
From: MGJ <62177301+MGJ520@users.noreply.github.com>
Date: Fri, 20 Feb 2026 23:02:22 +0800
Subject: [PATCH] Fix the bug where no information can be received the first
 time after reconfiguring the radio

---
 examples/companion_radio/MyMesh.cpp    | 3 +++
 examples/simple_repeater/MyMesh.cpp    | 6 ++++++
 examples/simple_room_server/MyMesh.cpp | 6 ++++++
 examples/simple_sensor/SensorMesh.cpp  | 6 ++++++
 src/Dispatcher.h                       | 2 ++
 5 files changed, 23 insertions(+)

diff --git a/examples/companion_radio/MyMesh.cpp b/examples/companion_radio/MyMesh.cpp
index 99b14952f..95b843f1a 100644
--- a/examples/companion_radio/MyMesh.cpp
+++ b/examples/companion_radio/MyMesh.cpp
@@ -1259,6 +1259,9 @@ void MyMesh::handleCmdFrame(size_t len) {
       savePrefs();
 
       radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
+      //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+      _radio->onSendFinished();
+      _radio->startRecv();
       MESH_DEBUG_PRINTLN("OK: CMD_SET_RADIO_PARAMS: f=%d, bw=%d, sf=%d, cr=%d", freq, bw, (uint32_t)sf,
                          (uint32_t)cr);
 
diff --git a/examples/simple_repeater/MyMesh.cpp b/examples/simple_repeater/MyMesh.cpp
index b6d855f68..fdb29dbd6 100644
--- a/examples/simple_repeater/MyMesh.cpp
+++ b/examples/simple_repeater/MyMesh.cpp
@@ -1253,12 +1253,18 @@ void MyMesh::loop() {
   if (set_radio_at && millisHasNowPassed(set_radio_at)) { // apply pending (temporary) radio params
     set_radio_at = 0;                                     // clear timer
     radio_set_params(pending_freq, pending_bw, pending_sf, pending_cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Temp radio params");
   }
 
   if (revert_radio_at && millisHasNowPassed(revert_radio_at)) { // revert radio params to orig
     revert_radio_at = 0;                                        // clear timer
     radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Radio params restored");
   }
 
diff --git a/examples/simple_room_server/MyMesh.cpp b/examples/simple_room_server/MyMesh.cpp
index 598b14de6..c12db17c3 100644
--- a/examples/simple_room_server/MyMesh.cpp
+++ b/examples/simple_room_server/MyMesh.cpp
@@ -870,12 +870,18 @@ void MyMesh::loop() {
   if (set_radio_at && millisHasNowPassed(set_radio_at)) { // apply pending (temporary) radio params
     set_radio_at = 0;                                     // clear timer
     radio_set_params(pending_freq, pending_bw, pending_sf, pending_cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Temp radio params");
   }
 
   if (revert_radio_at && millisHasNowPassed(revert_radio_at)) { // revert radio params to orig
     revert_radio_at = 0;                                        // clear timer
     radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Radio params restored");
   }
 
diff --git a/examples/simple_sensor/SensorMesh.cpp b/examples/simple_sensor/SensorMesh.cpp
index f05fb245c..afc677b19 100644
--- a/examples/simple_sensor/SensorMesh.cpp
+++ b/examples/simple_sensor/SensorMesh.cpp
@@ -882,12 +882,18 @@ void SensorMesh::loop() {
   if (set_radio_at && millisHasNowPassed(set_radio_at)) {   // apply pending (temporary) radio params
     set_radio_at = 0;  // clear timer
     radio_set_params(pending_freq, pending_bw, pending_sf, pending_cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Temp radio params");
   }
 
   if (revert_radio_at && millisHasNowPassed(revert_radio_at)) {   // revert radio params to orig
     revert_radio_at = 0;  // clear timer
     radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
+    //You need to clear the old registers, otherwise the LoRa module won't receive any information the first time.
+    _radio->onSendFinished();
+    _radio->startRecv();
     MESH_DEBUG_PRINTLN("Radio params restored");
   }
 
diff --git a/src/Dispatcher.h b/src/Dispatcher.h
index 25a41d82c..6bd4f3abb 100644
--- a/src/Dispatcher.h
+++ b/src/Dispatcher.h
@@ -61,6 +61,8 @@ class Radio {
    */
   virtual void loop() { }
 
+  virtual void startRecv() { }
+
   virtual int getNoiseFloor() const { return 0; }
 
   virtual void triggerNoiseFloorCalibrate(int threshold) { }