File transfer example

Examples/Filetransfer.py

@@ -86,8 +86,10 @@ def client_connected(link):
 		# We pack a list of files for sending in a packet
 		data = umsgpack.packb(list_files())
 
+		RNS.log(str(len(data)))
+
 		# Check the size of the packed data
-		if len(data) <= RNS.Resource.SDU:
+		if len(data) <= RNS.Reticulum.LINK_MDU:
 			# If it fits in one packet, we will just
 			# send it as a single packet over the link.
 			list_packet = RNS.Packet(link, data)

RNS/Packet.py

@@ -39,7 +39,7 @@ class Packet:
 
 	# This is used to calculate allowable
 	# payload sizes
-	HEADER_MAXSIZE = 23
+	HEADER_MAXSIZE = RNS.Reticulum.HEADER_MAXSIZE
 
 	# TODO: This should be calculated
 	# more intelligently

RNS/Reticulum.py

@@ -1,6 +1,7 @@
 from Interfaces import *
 import ConfigParser
 from vendor.configobj import ConfigObj
+import RNS
 import atexit
 import struct
 import array
@@ -12,6 +13,11 @@ import RNS
 
 class Reticulum:
 	MTU            = 500
+	HEADER_MAXSIZE = 23
+
+	PAD_AES_HMAC   = 64
+	MDU            = MTU - HEADER_MAXSIZE
+	LINK_MDU       = MDU - PAD_AES_HMAC
 	router         = None
 	config         = None