Nano 33 family not working properly about rf24network HOT 5 CLOSED

My first guess: The nano 33 BLE has a faulty SPI connnection. Try slowing down the SPI speed

RF24 radio(9, 10, 4000000); // uses 4MHz instead of default 10MHz

Did you first try any RF24 lib examples? The scanner sketch is more of a tool than an example.
I have to ask as my suggestion doesn't involve RF24Network library, and doing so would help narrow down the problem.

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Some boards have a high impedance on certain data buses. In such cases, the high-to-low (& low-to-high) transitions on the MOSI/MISO/SCK lines may not be recognizable by the time the pulses reach the radio (or when they are returned to the board). This failure to interpret pulses results in corrupted data (AKA misinterpreted data) going to/from the radio's SPI connections. Some boards' data buses are just extremely sensitive in terms of identifying pulses from noisy power spikes.

Using short wires or pull-up resistors may help (no guarantee from me - please be cautious with pull-up resistors).

IIRC, you aren't the first person that reported this problematic experience with the Nano 33 BLE board.

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why slowing down the SPI speed solves the issue?

Sorry, I completely forgot to answer this. By slowing down the SPI speed, we can better serve a series of pulses that are more easily interpreted. And that's about as technical as I can get in this context.

from rf24network.

That was more than enough.
Thank you once again!

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Thank you @2bndy5
You nailed it 👍🏼 💯 , slowing down the SPI speed solved the issue.

If you don't mind me asking. When you say "has a faulty SPI connection", do you mean internal to the BLE? and why slowing down the SPI speed solves the issue? I'd like to understand what's going on 🤔

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