After sending raw data, it was time to send some meaningful data over SPI to BlueNRG and see if it responds properly. In my case I had to send a start up sequence that wakes the x-nucleo from sleep. On receiving this data packet, the x-nucleo is supposed to send back its buffer length and register status in the same SPI transaction. This meant that I had to setup a rotational data structure to send at one end and receive from the other.
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