at86rf215 stops receiving until sending a packet

[benpicco]

Description

After some time at86rf215 stops receiving frames. It's unclear yet what triggers this, but it happens when running as a border router with gnrc_netif_pktq and handling fragmented frames.

In this state, the driver will ignore all incoming traffic until it has sent out a frame on it's own. After that, normal operation continues for some time until the problem occurs again.

Steps to reproduce the issue

???

Expected results

at86rf215 is always ready to receive frames.

Actual results

at86rf215 can get into a state where it stops receiving frames until it has sent out a frame on it's own.

Workaround

Periodically trigger a frame send to a non-existing address when operating as a border router.

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