Electronic – Wireless NRF24L01 chip compatibility

This is likely a statement of a measurement similar to blocking dynamic range, which is a measure of how far above the noise floor a strong signal falling outside a receiver's filters can be, without degrading performance for desired signals.

However, this is a measurement that can vary widely for a given receiver, depending on how exactly it is defined/taken. Halfway decent receivers will have great numbers for a signal which falls outside of all of the filters (and avoids any frequencies where the the design is susceptible to imaging, mixing with spurs, component limitations etc). But the same receiver's ability to block a signal which gets through some filters - for example, passing through the analog filtering and being rejected only at a post-ADC digitial filter - will typically be notably lower.

Without knowing how the measurement is taken, you can't really interpret the given number.

Similarly, as precise definitions of blocking dynamic range differ from source to source, I am specifically choosing not to endorse any of them with links.

I would suggest you edit this question and use the code format to pretty print your code as it's very hard to follow the way it currently is.

The value for the pipe variable is an address, more or less the equivalent of your computer IP address: when a message is broadcast into the air all the potential receivers will filter out any message not corresponding to an address they are interested into.

In particular your nRF24L01+ chip is capable to listen for up to 6 addresses.

Another address is the one you use to transmit, so that everybody receiving your message knows who has sent it and to reply to.

So, in your code radio.openReadingPipe(1,pipe); // pipe value being 0xE8E8F0F0E1LL

means hey, radio, use the second pipe to listen for any message incoming from address 0xE8E8F0F0E1LL, while radio.openWritingPipe(pipe); // pipe value being 0xE8E8F0F0E1LL

means hey, radio, when sending messages identify yourself with address 0xE8E8F0F0E1LL.

That's the explanation for the pipe thing and in a short form: those two values in your sketch must match.

Regarding the fact you are not receiving the message, I suggest the following:

1. try setting the message payload size to a fixed value with radio.setPayloadSize(1)
2. add a 1uF capacitor short between GND and Vcc on your nRF24 board
3. try to use the most reliable configuration which, on the nRF24L01+ is the 250Kbps with maximum PA level by setting radio.setPALevel(RF24_PA_HIGH); radio.setDataRate(RF24_250KBPS);