TCPIP stack crashing

[saurabhbansal90]

I am using Contiki OS on CC2650 from TI. There I am using udp-server.c and rpl-border-router.c for communication between them.
For communication I am creating sockets and sending and recieving the data continously. But this communication is stopping after approx. 4000 transactions. I am creating a timer also and printing some data in serial.
The reason for communication stop seems to be TCPIP stack crash, as the microcontroller is running after communication stopping also.
So can somebody help me how to debug it further and resolve the issue.

[saurabhbansal90]

Can anyone provide the information like how long the communication has been done with Contiki OS. I think it is issue with stack in Contiki OS as after communication stops, the micro is still working.

[niziak]

You should compile some contiki .c files with debug enabled to see where communication stops. You have to modify .c files (e.g. /core/net/mac/sicslowmac/sicslowmac.c) to change lines with #define DEBUG 0

We are using Contiki with CC1310 for days. Hundreds of megabytes transferred without problem(after I've fixed the radio with #2161)

[saurabhbansal90]

Hello Niziak, thanks a lot for guidance. I will look into the issue as suggested.

[saurabhbansal90]

Hello Niziak, I am trying to resolve this issue and I am having below setup -

• Linux board, running TunSLIP6
• CC2650 running rpl-border-router and interfaced with linux board by SLIP protocol
• CC2650 running udp-server program

I am creating a tunnel in my Linux board, and pinging to udp-server node. I observed that the ping stops for sometime and start getting responses again, like below -
64 bytes from aaaa::212:4b00:79e:8f87: seq=16 ttl=63 time=61.401 ms
64 bytes from aaaa::212:4b00:79e:8f87: seq=46 ttl=63 time=158.386 ms

Please observe the seq id's. So for sometime I am not getting ping response on my Linux console, but actually it seems to be happeing.
I tried to debug the Border-Router code and found there is a function static int output(void) which is called in core/net/ip/tcpip.c file at line 578. This function is responsible to send recieved packet to serial by SLIP. I observed this function static int output(void) is not being called from tcpip.c for sometime and it start being called after sometime.
And there is one more function static void slip_input_callback(void) in slip-bridge.c file, which is responsible to recieve packets by SLIP in Border-Router. And this function is called perfactly without any problem. That's why ping seems to be working from radio side, but not able to send recieved packets to SLIP.

Can someone please tell me the possible reason for this behavior or some flags that I can check to debug it further.

[niziak]

I don't know, try to add "define NETSTACK_CONF_RDC nullrdc_driver" in project-conf.h

[saurabhbansal90]

Hello Niziak,
I did some testing with enabling logs in tcpip.c file. And there I got below output:

tcpip_ipv6_output: no route found, using default route
tcpip_ipv6_output: Destination off-link but no route

This seems to be a configuration issue, rather any bug in stack. So can you please give me some hint to solve this issue.

[saurabhbansal90]

I am using the latest contiki source now, and it doesn't possess any such issue.
Thanks for your support, Niziak.