Correct switch to PKT on control packet

lib/KISS_TO_TNC2/KISS.h

@@ -26,5 +26,5 @@
 #define ERROR_QUEUE_FULL  0x04
 
 //Data control frames, ported from Direwolf
-#define T_PKT             0xaa
+#define T_PKT             0x03
 #define R_PKT             0xa6

lib/KISS_TO_TNC2/KISS_TO_TNC2.cpp

@@ -127,13 +127,20 @@ String decode_kiss(const String &inputKISSTNCFrame, bool &dataFrame, bool &pktFr
 
   if (validateKISSFrame(inputKISSTNCFrame)) {
     dataFrame = inputKISSTNCFrame.charAt(1) == CMD_DATA;
-    pktFrame = inputKISSTNCFrame.charAt(2) == T_PKT;
-    if (dataFrame && pktFrame) {
+   for (int i = 0; i < inputKISSTNCFrame.length(); ++i) 
+   {
+    char currentChar = inputKISSTNCFrame.charAt(i);
+    if (currentChar == (char) T_PKT) 
+    {
+      pktFrame = true;
+    }
+  }
+    if (dataFrame && !pktFrame) {
       String ax25Frame = decapsulateKISS(inputKISSTNCFrame);
       delay(250);
       TNC2Frame += ax25Frame;
     }
-    else if (dataFrame){
+    else if (dataFrame && pktFrame){
       String ax25Frame = decapsulateKISS(inputKISSTNCFrame);
       bool isLast = false;
       String dst_addr = decode_address_ax25(ax25Frame.substring(0, 7), isLast, false);