Add support for split operation

config.h

@@ -58,7 +58,8 @@
 #endif
 
 // LoRa protocol default parameters (they need to match between devices!!!)
-#define CFG_LORA_FREQ         433.775e6   // frequency in MHz
+#define CFG_LORA_FREQ_RX      433.775e6   // RX frequency in MHz
+#define CFG_LORA_FREQ_TX      433.775e6   // TX frequency in MHz
 #define CFG_LORA_BW           125e3       // bandwidth (from 7.8 kHz up to 500 kHz)
 #define CFG_LORA_SF           12          // spreading factor (6 - 12), 6 requires implicit header mode
 #define CFG_LORA_CR           7           // coding rate (5 - 8)

esp32_loraprs.ino

@@ -30,8 +30,9 @@ void initializeConfig(LoraPrs::Config &cfg) {
   // client/server mode switch
   cfg.IsClientMode = CFG_IS_CLIENT_MODE;
 
-  // lora parameters, mus match on devices
-  cfg.LoraFreq = CFG_LORA_FREQ;
+  // lora parameters, must match on devices
+  cfg.LoraFreqRx = CFG_LORA_FREQ_RX;
+  cfg.LoraFreqTx = CFG_LORA_FREQ_TX;
   cfg.LoraBw = CFG_LORA_BW;
   cfg.LoraSf = CFG_LORA_SF;
   cfg.LoraCodingRate = CFG_LORA_CR;

loraprs_config.h

@@ -12,7 +12,8 @@ struct Config
   bool IsClientMode;    // false - server mode, true - client mode (disables wifi and aprsis)
 
   // lora protocol parameters
-  long LoraFreq;        // lora frequency, e.g. 433.775e6
+  long LoraFreqRx;      // lora RX frequency, e.g. 433.775e6
+  long LoraFreqTx;      // lora TX frequency, e.g. 433.775e6
   long LoraBw;          // lora bandwidth, e.g. 125e3
   int LoraSf;           // lora spreading factor, e.g. 12
   int LoraCodingRate;   // lora coding rate, e.g. 7

loraprs_service.cpp

@@ -67,7 +67,7 @@ void Service::setup(const Config &conf)
   aprsLoginCommand_ += String("\n");
 
   // peripherals, LoRa
-  setupLora(config_.LoraFreq, config_.LoraBw, config_.LoraSf, 
+  setupLora(config_.LoraFreqRx, config_.LoraBw, config_.LoraSf, 
     config_.LoraCodingRate, config_.LoraPower, config_.LoraSync, config_.LoraCrc, config_.LoraExplicit);
 
 #ifdef USE_RADIOLIB
@@ -584,22 +584,26 @@ void Service::performFrequencyCorrection() {
   long frequencyErrorHz = LoRa.packetFrequencyError();
 #endif
   if (abs(frequencyErrorHz) > config_.AutoFreqCorrectionDeltaHz) {
-    config_.LoraFreq -= frequencyErrorHz;
+    config_.LoraFreqRx -= frequencyErrorHz;
     LOG_INFO("Correcting frequency:", frequencyErrorHz);
-#ifdef USE_RADIOLIB
-    radio_->setFrequency((float)config_.LoraFreq / 1e6);
+    setupFreq(config_.LoraFreqRx);
+  }
+}
+
+void Service::setupFreq(long loraFreq) const {
+  #ifdef USE_RADIOLIB
+    radio_->setFrequency((float)config_.LoraFreqRx / 1e6);
     int state = radio_->startReceive();
     if (state != ERR_NONE) {
       LOG_ERROR("Start receive error:", state);
     }
 #else
-    LoRa.setFrequency(config_.LoraFreq);
+    LoRa.setFrequency(config_.LoraFreqRx);
     if (config_.LoraUseIsr) {
       LoRa.idle();
       LoRa.receive();
     }
 #endif
-  }
 }
 
 #ifndef USE_RADIOLIB
@@ -676,6 +680,9 @@ void Service::processIncomingRawPacketAsServer(const byte *packet, int packetLen
 
 bool Service::onRigTxBegin()
 {
+  if (splitEnabled()) {
+    setupFreq(config_.LoraFreqTx);
+  }
   if (config_.PttEnable) {
     digitalWrite(config_.PttPin, HIGH);
     delay(config_.PttTxDelayMs);
@@ -728,6 +735,9 @@ void Service::onRigTxEnd()
     LoRa.endPacket(true);
 #endif
   }
+  if (splitEnabled()) {
+    setupFreq(config_.LoraFreqRx);
+  }
 }
 
 void Service::attachKissNetworkClient() 
@@ -844,7 +854,7 @@ void Service::onRadioControlCommand(const std::vector<byte> &rawCommand) {
     LOG_INFO("Setting new radio parameters");
     const struct SetHardware * setHardware = reinterpret_cast<const struct SetHardware*>(rawCommand.data());
     
-    config_.LoraFreq = be32toh(setHardware->freq);
+    config_.LoraFreqRx = be32toh(setHardware->freq);
     config_.LoraBw = be32toh(setHardware->bw);
     config_.LoraSf = be16toh(setHardware->sf);
     config_.LoraCodingRate = be16toh(setHardware->cr);
@@ -852,7 +862,7 @@ void Service::onRadioControlCommand(const std::vector<byte> &rawCommand) {
     config_.LoraSync = be16toh(setHardware->sync);
     int crcType = setHardware->crc ? config_.LoraCrc : 0;
 
-    setupLora(config_.LoraFreq, config_.LoraBw, config_.LoraSf, 
+    setupLora(config_.LoraFreqRx, config_.LoraBw, config_.LoraSf, 
       config_.LoraCodingRate, config_.LoraPower, config_.LoraSync, crcType, config_.LoraExplicit);
   } else {
     LOG_ERROR("Radio control command of wrong size");

loraprs_service.h

@@ -42,6 +42,7 @@ private:
 
   void setupWifi(const String &wifiName, const String &wifiKey);
   void setupLora(long loraFreq, long bw, int sf, int cr, int pwr, int sync, int crcBytes, bool isExplicit);
+  void setupFreq(long loraFreq) const;
   void setupBt(const String &btName);
 
   void reconnectWifi() const;
@@ -84,6 +85,9 @@ private:
     return !config_.IsClientMode  // beaconing only in apris gate / server mode
     && config_.EnableBeacon;  // beacon must be explicitly enabled
   }
+  inline bool splitEnabled() const {
+    return config_.LoraFreqRx != config_.LoraFreqTx;
+  }
 
 protected:
   virtual bool onRigTxBegin();