Dear developers, I have been working on the kw41zrf driver in PR #7107 [1]. However, I can't get 6lowpan fragmented packets to transmit properly. It seems the GNRC stack is trying to pass the next fragment to the netdev driver before the first fragment has finished transmitting over the air, resulting in the driver rejecting the send request. Is this a known problem with any other radio drivers or is it my driver doing something wrong? Also, the send code in _send_nth_fragment in gnrc_sixlowpan_frag contains a check of the return value of gnrc_netapi_send [2], but it seems like my return code is lost somewhere along the way, because I never see that debug message.
How do I get the 6lo thread to wait until the radio driver is ready to send the next fragment?
[1]: https://github.com/RIOT-OS/RIOT/pull/7107 [2]: https://github.com/RIOT-OS/RIOT/blob/master/sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c#L211
Best regards, Joakim Nohlgård Eistec AB