be more tolerant of laggy networks;

9001 · 9001 · commit 72acb1144ce3 · 2024-06-14T23:13:08.000+02:00
client has a 5sec timeout before it retries the RRQ when
initiating a download

previously, if client eventually received a response for
both of the issued RRQ's, it would panic and disconnect

instead, ignore the duplicate ack/oack and keep going
diff --git a/partftpy/TftpStates.py b/partftpy/TftpStates.py
@@ -530,6 +530,10 @@ def handle(self, pkt, raddress, rport):
             self.sendError(TftpErrors.IllegalTftpOp)
             raise TftpException("Received ERR from peer: " + str(pkt))
 
+        elif isinstance(pkt, TftpPacketACK) or isinstance(pkt, TftpPacketOACK):
+            log.warning("Discarding unexpected packet type (retransmission?): %s", pkt)
+            return self
+
         else:
             self.sendError(TftpErrors.IllegalTftpOp)
             raise TftpException("Received unknown packet type from peer: " + str(pkt))
