Thank you. I will apply the patch and update you the progress.
Thanks again. Abdul
The ping issue should be fixed by applying https://github.com/RIOT-OS/RIOT/pull/2727. The next problem you might run into with the sixlowapp is that the stacksize settings for the SAM R21 board are currently a little conservative, which causes it to run out of memory when trying to send a UDP packet with the nc command of the sixlowapp. This can be “fixed” by increasing the KERNEL_CONF_STACKSIZE_DEFAULT in RIOT/cpu/samd21/include/cpu-conf.h - I’ve got it to work by increasing it to 1536, but you might have to play around a little.