* added LLCC68 module support

src/helpers/CustomLLCC68.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <RadioLib.h>
+
+#define SX126X_IRQ_HEADER_VALID                     0b0000010000  //  4     4     valid LoRa header received
+
+class CustomLLCC68 : public LLCC68 {
+  public:
+    CustomLLCC68(Module *mod) : LLCC68(mod) { }
+
+    bool isReceiving() {
+      uint16_t irq = getIrqStatus();
+      bool hasPreamble = (irq & SX126X_IRQ_HEADER_VALID);
+      return hasPreamble;
+    }
+};

src/helpers/CustomLLCC68Wrapper.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "CustomLLCC68.h"
+#include "RadioLibWrappers.h"
+
+class CustomLLCC68Wrapper : public RadioLibWrapper {
+public:
+  CustomLLCC68Wrapper(CustomLLCC68& radio, mesh::MainBoard& board) : RadioLibWrapper(radio, board) { }
+  bool isReceiving() override { 
+    if (((CustomLLCC68 *)_radio)->isReceiving()) return true;
+
+    idle();  // put sx126x into standby
+    // do some basic CAD (blocks for ~12780 micros (on SF 10)!)
+    bool activity = (((CustomLLCC68 *)_radio)->scanChannel() == RADIOLIB_LORA_DETECTED);
+    idle();
+
+    return activity;
+  }
+  float getLastRSSI() const override { return ((CustomLLCC68 *)_radio)->getRSSI(); }
+  float getLastSNR() const override { return ((CustomLLCC68 *)_radio)->getSNR(); }
+};