correctly set the mode/type for serial channels

lib/serial/GwSerial.cpp

@@ -79,6 +79,9 @@ String GwSerial::getMode(){
     }
     return "UNKNOWN";
 }
+int GwSerial::getType() {
+    return type;
+}
 
 bool GwSerial::isInitialized() { return initialized; }
 size_t GwSerial::enqueue(const uint8_t *data, size_t len, bool partial)

lib/serial/GwSerial.h

@@ -43,6 +43,7 @@ class GwSerial : public GwChannelInterface{
         bool getAvailableWrite(){return availableWrite;}
         virtual void begin(unsigned long baud, uint32_t config=SERIAL_8N1, int8_t rxPin=-1, int8_t txPin=-1)=0;
         virtual String getMode() override;
+        virtual int getType() override;
     friend GwSerialStream;
 };
 
@@ -122,6 +123,7 @@ template<typename T>
             setError(serial,logger);
         };
 
+
     };