AT86RF2xx supports high data rates in O-QPSK mode.
This is a proprietary feature, so data rates > 0 are only supported by
other AT86RF2xx devices.
high_rate 0: 250 kbit/s (IEEE mode)
high_rate 1: 500 kbit/s
high_rate 2: 1000 kbit/s (compatible with at86rf215)
high_rate 3: 2000 kbit/s
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