outline for encap

added a reply function server>client

BUG=

[mustafa.alabaychi, 2017-10-07 09:50:47]

Here is the reply-to-client function added to udp-server.c. Can you please
review. 

/Mustafa

[armangungor, 2017-10-08 21:32:43]

A good step for learning & practicing coding in Contiki. This new function
called at line:80" reply_to_client(appdata)" which is added in prev commit. It
might be better to add them in a single commit to make it more traceable.

https://codereview.appspot.com/330490043/diff/1/udp-server.c
File udp-server.c (right):

https://codereview.appspot.com/330490043/diff/1/udp-server.c#newcode60
udp-server.c:60: static void reply_to_client(char * rcv_msg){
A good step for learning & practicing coding in Contiki. This new function
called at line:80 "reply_to_client(appdata)" which is added in prev commit. It
might be better to add them in a single commit to make it more traceable.

[mustafa.alabaychi, 2017-10-10 22:12:42]

Please review. Extension and improvement suggestions are welcome.

[safa.ismail.SI, 2017-10-11 10:37:47]

It is a good way to start as you are modifying the original code "udp-server.c".
However, it is much better if you could provide comments that explains what the
function does.

Regards,
Safa

https://codereview.appspot.com/330490043/diff/20001/tun.c
File tun.c (right):

https://codereview.appspot.com/330490043/diff/20001/tun.c#newcode33
tun.c:33: uip_udp_packet_sendto(tun_conn, pkt_ptr, 48+uip_len,
&UIP_IP_BUF->srcipaddr, UIP_HTONS(UDP_CLIENT_PORT));
you can add a comment that describes how what the "encap" function does.
It is unclear to me how it works.