fix:NetworkUDP - in parsePacket handle previous parsed packet

Author: JAndrassy

libraries/Network/src/NetworkUdp.cpp

@@ -292,18 +292,14 @@ void NetworkUDP::flush() {}
 
 int NetworkUDP::parsePacket() {
   if (rx_buffer) {
-    return 0;
+    if (rx_buffer->full()) { // packet was not read yet
+      return rx_buffer->available();
+    }
+    clear(); // discard the rest of the packet
   }
   struct sockaddr_storage si_other_storage;  // enough storage for v4 and v6
   socklen_t slen = sizeof(sockaddr_storage);
-  int len = 0;
-  if (ioctl(udp_server, FIONREAD, &len) == -1) {
-    log_e("could not check for data in buffer length: %d", errno);
-    return 0;
-  }
-  if (!len) {
-    return 0;
-  }
+  int len;
   char *buf = (char *)malloc(1460);
   if (!buf) {
     return 0;