Update preamble dynamically to match runtime SF changes via CLI

src/helpers/radiolib/CustomLLCC68Wrapper.h

@@ -20,6 +20,7 @@ public:
     int sf = ((CustomLLCC68 *)_radio)->spreadingFactor;
     return packetScoreInt(snr, sf, packet_len);
   }
+  uint8_t getSpreadingFactor() const override { return ((CustomLLCC68 *)_radio)->spreadingFactor; }
 
   void doResetAGC() override { sx126xResetAGC((SX126x *)_radio); }
 };

src/helpers/radiolib/CustomLR1110.h

@@ -27,4 +27,6 @@ class CustomLR1110 : public LR1110 {
       bool detected = ((irq & RADIOLIB_LR11X0_IRQ_SYNC_WORD_HEADER_VALID) || (irq & RADIOLIB_LR11X0_IRQ_PREAMBLE_DETECTED));
       return detected;
     }
+
+    uint8_t getSpreadingFactor() const { return spreadingFactor; }
 };

src/helpers/radiolib/CustomLR1110Wrapper.h

@@ -19,10 +19,11 @@ public:
 
   void onSendFinished() override {
     RadioLibWrapper::onSendFinished();
-    _radio->setPreambleLength(LORA_SF <= 8 ? 32 : 16); // overcomes weird issues with small and big pkts
+    _radio->setPreambleLength(getSpreadingFactor() <= 8 ? 32 : 16); // overcomes weird issues with small and big pkts
   }
 
   float getLastRSSI() const override { return ((CustomLR1110 *)_radio)->getRSSI(); }
   float getLastSNR() const override { return ((CustomLR1110 *)_radio)->getSNR(); }
+  uint8_t getSpreadingFactor() const override { return ((CustomLR1110 *)_radio)->getSpreadingFactor(); }
   int16_t setRxBoostedGainMode(bool en) { return ((CustomLR1110 *)_radio)->setRxBoostedGainMode(en); };
 };

src/helpers/radiolib/CustomSTM32WLxWrapper.h

@@ -21,6 +21,7 @@ public:
     int sf = ((CustomSTM32WLx *)_radio)->spreadingFactor;
     return packetScoreInt(snr, sf, packet_len);
   }
+  uint8_t getSpreadingFactor() const override { return ((CustomSTM32WLx *)_radio)->spreadingFactor; }
 
   void doResetAGC() override { sx126xResetAGC((SX126x *)_radio); }
 };

src/helpers/radiolib/CustomSX1262Wrapper.h

@@ -20,6 +20,7 @@ public:
     int sf = ((CustomSX1262 *)_radio)->spreadingFactor;
     return packetScoreInt(snr, sf, packet_len);
   }
+  uint8_t getSpreadingFactor() const override { return ((CustomSX1262 *)_radio)->spreadingFactor; }
   virtual void powerOff() override {
     ((CustomSX1262 *)_radio)->sleep(false);
   }

src/helpers/radiolib/CustomSX1268Wrapper.h

@@ -20,6 +20,7 @@ public:
     int sf = ((CustomSX1268 *)_radio)->spreadingFactor;
     return packetScoreInt(snr, sf, packet_len);
   }
+  uint8_t getSpreadingFactor() const override { return ((CustomSX1268 *)_radio)->spreadingFactor; }
 
   void doResetAGC() override { sx126xResetAGC((SX126x *)_radio); }
 };

src/helpers/radiolib/CustomSX1276Wrapper.h

@@ -19,4 +19,5 @@ public:
     int sf = ((CustomSX1276 *)_radio)->spreadingFactor;
     return packetScoreInt(snr, sf, packet_len);
   }
+  uint8_t getSpreadingFactor() const override { return ((CustomSX1276 *)_radio)->spreadingFactor; }
 };

src/helpers/radiolib/RadioLibWrappers.cpp

@@ -26,7 +26,7 @@ void setFlag(void) {
 
 void RadioLibWrapper::begin() {
   _radio->setPacketReceivedAction(setFlag);  // this is also SentComplete interrupt
-  _radio->setPreambleLength(LORA_SF <= 8 ? 32 : 16); // longer preamble for lower SF improves reliability
+  _radio->setPreambleLength(getSpreadingFactor() <= 8 ? 32 : 16); // longer preamble for lower SF improves reliability
   state = STATE_IDLE;
 
   if (_board->getStartupReason() == BD_STARTUP_RX_PACKET) {  // received a LoRa packet (while in deep sleep)
@@ -143,6 +143,7 @@ uint32_t RadioLibWrapper::getEstAirtimeFor(int len_bytes) {
 
 bool RadioLibWrapper::startSendRaw(const uint8_t* bytes, int len) {
   _board->onBeforeTransmit();
+  _radio->setPreambleLength(getSpreadingFactor() <= 8 ? 32 : 16); // keep preamble in sync with current SF
   int err = _radio->startTransmit((uint8_t *) bytes, len);
   if (err == RADIOLIB_ERR_NONE) {
     state = STATE_TX_WAIT;

src/helpers/radiolib/RadioLibWrappers.h

@@ -38,6 +38,7 @@ public:
   }
 
   virtual float getCurrentRSSI() =0;
+  virtual uint8_t getSpreadingFactor() const { return LORA_SF; }
 
   int getNoiseFloor() const override { return _noise_floor; }
   void triggerNoiseFloorCalibrate(int threshold) override;