nRF24L01+ module not sending data

[Whandall]

@mastermindscope

I just want to send my packet without it being altered. In the spiTransfer function you can see that if you use a negative length, the intermediate is used so the packet data is not altered.

That is not what you accomplish by copying the pointer to the object,
it will still be a pointer to the very same object.

@mastermindscope

As far as I understand CRC only checks if you sent this packet already or not.

So your understanding is simply wrong, regarding the "only".
The CRC allows you to check for invalid packets and transmission errors.
Without a CRC, you will receive any junk that happens to match preamble + pipe adr.
Errors that change the content of your packets will go unnoticed without a CRC.

@mastermindscope

The nano stops doing anything after

@mastermindscope

SPI.begin();

I tried blinking the on-board LED before and after SPI.begin() but only before did the LED do something. Can I not use SPI.begin in the setup?

Do you still have pin 10 set as OUTPUT?
With proper configuration and a properly connected SPI bus,
there is no problem calling spi.begin(); in setup.