fix: swap restored radio config under the radio lock

Restoring a backup wrote the transceiver config in place from the async
task while the radio task could be transmitting with it.

Read the record into a copy and swap it in through the new
Transceiver::setConfig, which Transceiver::fromJSON now uses as well.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ConfigFile.cpp

@@ -608,7 +608,10 @@ bool ShadeConfigFile::restoreFile(SomfyShadeController *s, const char *filename,
   if(opts.shades) s->commit();
   if(opts.transceiver)
   {
-    this->readTransRecord(s->transceiver.config);
+    // Read into a copy so the radio task never transmits on a half restored config.
+    transceiver_config_t cfg = s->transceiver.config;
+    this->readTransRecord(cfg);
+    s->transceiver.setConfig(cfg);
     s->transceiver.save();
   }
   if(opts.settings || opts.network) settings.save();

src/Somfy.cpp

@@ -4812,17 +4812,21 @@ bool Transceiver::toJSON(JsonObject& obj) {
 bool Transceiver::fromJSON(JsonObject& obj) {
     if (!obj["config"].isNull()) {
       JsonObject objConfig = obj["config"];
-      // Parse into a copy so the radio task never sees a half updated config,
+      // Parse into a copy so the radio task never sees a half updated config.
-      // then swap it in once any transmission in flight has stopped.  Queued
-      // jobs are kept and go out with the new settings.
       transceiver_config_t cfg = this->config;
       cfg.fromJSON(objConfig);
-      RadioLock lock(portMAX_DELAY, true);
+      this->setConfig(cfg);
-      if(this->config.enabled && this->config.TXPin != cfg.TXPin) pinMode(this->config.TXPin, INPUT);
-      this->config = cfg;
     }
     return true;
 }
+void Transceiver::setConfig(const transceiver_config_t &cfg) {
+  // Swap the whole config in once any transmission in flight has stopped so the
+  // radio task never sees a half updated one.  Queued jobs are kept and go out
+  // with the new settings.
+  RadioLock lock(portMAX_DELAY, true);
+  if(this->config.enabled && this->config.TXPin != cfg.TXPin) pinMode(this->config.TXPin, INPUT);
+  this->config = cfg;
+}
 bool Transceiver::usesPin(uint8_t pin) {
   if(this->config.enabled) {
     if(this->config.SCKPin == pin ||

src/Somfy.h

@@ -559,6 +559,7 @@ class Transceiver {
     bool printBuffer = false;
     //bool toJSON(JsonObject& obj);
     bool fromJSON(JsonObject& obj);
+    void setConfig(const transceiver_config_t &cfg);
     bool save();
     bool begin();
     void loop();