nRF24L01.h Mirf.setTADDR & setRADDR Question

Projects Networking, Protocols, and Devices
1

Dear forum,

I've been using Arduino for a year now, doing some projects, lurking this forum for help and answers. Decided to start a thread because I couldn't find a simple explanation to a certain question so far.

While using nRF24L01 modules, including

#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>

in my sketches, I came across two setup functions of Mirf that I cannot grasp.

Namely, Mirf.setTADDR & setRADDR.
Folks suggest setting TADDR when you transmit, or RADDR when you receive, thus the first letter change, that I understood.

I see many sketches using them, and some that don't, but in personal implementations I don't see any difference while I am using them or not, naming them the same or not. My nodes were sending and receiving the information back and forth without being affecting by those configurations.

So, what would be the simplest explanation for those two functions? What are they used for? And what are their function in multi-node projects?

2

The functions are exactly as they suggest, and as you mentioned
It would be good to see a snippet of the use of code which confuses you

I use the RF24 library (similar), in there is an example called pingpair, in that the two addresses are different on different nodes for a good reason

Its is to do with the PIPE that is being used, perhaps this helps ?

node 0      node 1     
readpipe0   readpipe1   
writepipe1  writepipe0

so node 0 transmits on pipe1, but receives on pipe0
and node 1 transmits on pipe0, but receives on pipe1

its basically so that the two pipes can work independently reducing the chance of lost messages I guess