Compatibility tested

Tested compatibility with easy test client and test server. So far, no
errors anymore. (In Both python2 and python3)
Just tested basic functionality!

1 files changed, 4 insertions, 2 deletions

diff --git a/tftpy/TftpPacketTypes.py b/tftpy/TftpPacketTypes.py
index e26563e..07871e4 100644
--- a/tftpy/TftpPacketTypes.py
+++ b/tftpy/TftpPacketTypes.py
@@ -124,8 +124,10 @@ class TftpPacketInitial(TftpPacket, TftpPacketWithOptions):
         tftpassert(self.filename, "filename required in initial packet")
         tftpassert(self.mode, "mode required in initial packet")
         # Make sure filename and mode are bytestrings.
-        self.filename = self.filename.encode('ascii')
-        self.mode = self.mode.encode('ascii')
+        if not isinstance(self.filename, bytes):
+            self.filename = self.filename.encode('ascii')
+        if not isinstance(self.mode, bytes):
+            self.mode = self.mode.encode('ascii')
 
         ptype = None
         if self.opcode == 1: ptype = "RRQ"