6lowPAN on nrf51822

[Mihail]

I use this step-by-step guide to run nrf51 Iot SDK example on nRF51822.

First I modified app_ipv6_coap_client_pca10028 such that I can run it on nRF51822. I downloaded latest RPI Raspbian Debian Wheezy Kernel v3.18. After that I update it to Linux raspberrypi 3.18.9-v7+ which has 6lowpan support included. So I don't need to do steps 4.c, 5 and 6.d-e, 7 in "Installing required packages on the Raspberry Pi" part.

Next I got account on Sixxs(aiccu) to be able to ping device over internet because my provider don't use ipv6. So I need tunnel. I addded Sixxs prefix to interface bt0

{
AdvSendAdvert on;
prefix <Sixxs prefix>/64
{
AdvOnLink off;
AdvAutonomous on;
AdvRouterAddr on;
};
};

I also add /sbin/ip addr add ::1/64 dev bt0

After that I connected to device and can ping but after some minutes connection lost and I need do connect to device again. So auto connection is needed! And I don't know the reason why connection lost. Device lies close to RPI.

Could anybody suggest how to do auto connect and find reason of disconnection?

[Asbjørn]

We have seen some similar behavior here when we are using the hcitool. It seems like there's a small bug or issue with 6lowPAN and Raspian for doing scanning while in a connected state. At least what we have seen occasionally and reported that if you are in a connection and does a hciscan, the Raspberry sometimes lock up. Is it possible that you are doing something similar?

If we avoid doing scans once you are connected, it seems to be more stable.