Serial tx delay update

include/kiss_processor.h

@@ -50,6 +50,7 @@ protected:
       None = 0x80
   };
 
+  static const int CfgToSerialDelayMs = 10;
   static const int CfgSerialToRigQueueSize = 4096;
   static const int CfgRigToSerialQueueSize = 4096;
 

src/kiss_processor.cpp

@@ -134,7 +134,7 @@ bool Processor::processRigToSerial()
     onRigPacket(&buf, rxPacketSize);
 
     isProcessed = true;
-    yield();
+    if (!rigToSerialQueueIndex_.isEmpty()) delay(CfgToSerialDelayMs);
   }
   return isProcessed;
 }