diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.cpp b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
index 84d82832..5c9b697c 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.cpp
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
@@ -289,6 +289,10 @@ float PhysicalLayer::getSNR() {
   return(RADIOLIB_ERR_UNSUPPORTED);
 }
 
+int16_t PhysicalLayer::scanChannel() {
+  return(RADIOLIB_ERR_UNSUPPORTED); 
+}
+
 int32_t PhysicalLayer::random(int32_t max) {
   if(max == 0) {
     return(0);
diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.h b/src/protocols/PhysicalLayer/PhysicalLayer.h
index fa0ec231..ef5dd93e 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.h
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.h
@@ -302,6 +302,14 @@ class PhysicalLayer {
     */
     virtual float getSNR();
 
+    /*!
+      \brief Check whether the current communication channel is free or occupied. Performs CAD for LoRa modules,
+      or RSSI measurement for FSK modules.
+      \returns RADIOLIB_CHANNEL_FREE when channel is free,
+      RADIOLIB_PREAMBLE_DETECTEDwhen occupied or other \ref status_codes.
+    */
+    virtual int16_t scanChannel();
+
     /*!
       \brief Get truly random number in range 0 - max.
       \param max The maximum value of the random number (non-inclusive).