Added ThirdPartyPacket decoding in tcpkiss driver

This patch adds a check in the tcpkiss driver to
check to see if the packet is a 3rd party packet
and automatically return the subpacket if it is.

aprsd/client/drivers/tcpkiss.py

@@ -248,7 +248,11 @@ class TCPKISSDriver:
         LOG.warning(f'FRAME: {str(frame)}')
         try:
             aprslib_frame = aprslib.parse(str(frame))
-            return core.factory(aprslib_frame)
+            packet = core.factory(aprslib_frame)
+            if isinstance(packet, core.ThirdPartyPacket):
+                return packet.subpacket
+            else:
+                return packet
         except Exception as e:
             LOG.error(f'Error decoding packet: {e}')
             return None