From 3dc7e5c8d64cc1b10ed36141836ec5ba94fba0c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hubert=20Mi=C5=9B?= <hubert.mis@gmail.com>
Date: Tue, 22 Dec 2020 13:19:12 +0100
Subject: [PATCH] Fix payload transmitted in Block2 transfer.
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Previosly the CoAP server transmitted the first block of data for Block2
transfer, even when a client requested in Block2 request following
block. This patch changes server operation to transmit the payload
block requested by the client.

Signed-off-by: Hubert Miś <hubert.mis@gmail.com>
---
 coapthon/layers/blocklayer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/coapthon/layers/blocklayer.py b/coapthon/layers/blocklayer.py
index 8f698a3..2e5bb9d 100644
--- a/coapthon/layers/blocklayer.py
+++ b/coapthon/layers/blocklayer.py
@@ -58,7 +58,7 @@ class BlockLayer(object):
                 del transaction.request.block2
             else:
                 # early negotiation
-                byte = 0
+                byte = num * size
                 self._block2_receive[key_token] = BlockItem(byte, num, m, size)
                 del transaction.request.block2