My code needs more documentation, a principles of operation document and more examples.
I named it NRF24, maybe that should also be changed before a real release.
If you want to have a look at it, I attach a snapshot.
The doxygen output makes it rather fat. 
One of the examples that are included.
#include <OUtility.h>
#include <SimCommDefs.h>
#include <SPI.h>
#include <NRF24.h>
bool doAcks = true; // two send modes
const byte addr[] PROGMEM = "pipe0" "pipe1" "pipe2" "pipe3" "pipe4" "pipe5";
const byte tMsg[] PROGMEM = "****Test Message";
// SPI pins CE,CS,IRQ,Receive, State
NRF24 radio(9, 10, 2, procRcb, procEvent);
byte noOfPipes = 6;
void setup() {
Serial.begin(115200);
Serial.println(F("NRF24 minimum Ack/noAck six"));
Serial.println(F("s - send, a - change Ack/noAck, p - pipes, ? - state"));
// a table of 6 addresses, in PROGMEM and MSB format
radio.addresses(addr, 6, dcInPM + dcLen5 + dcMSB);
// listen on 6 pipes without suppressing acks
radio.listenOn(0, aiFirst, 6, false);
radio.begin(PRX);
radio.printMode();
radio.printPipes();
}
void loop() {
radio.processEvents();
serialHandler();
}
byte procRcb(RCB& rcb) {
return rPrint;
}
byte procEvent(Event& e) {
if (e.txAny()) {
radio.printSendResult();
}
return 0;
}
void processCmd(char* buf) {
switch (*buf) {
// send the testmessage to a random address from the table
case 's': radio.send(aiFirst + random(0, 6), &tMsg, sizeof(tMsg), !doAcks, dcInPM);
break;
case 'a': repFlipBool(PSTR("Acknowlege"), doAcks);
break;
case '?': radio.printState();
break;
case 'p': radio.printPipes();
break;
case 'I': if (*++buf) {
nodeId(*buf);
} else {
printNode();
}
}
}
// Command line stuff
void pEqOnOff(bool val) {
Serial.print(F(" = ")); Serial.print(val ? F("ON") : F("OFF"));
}
void repFlipBool(const char* named, bool& Val) {
Val = !Val;
repBool(named, Val);
}
void repBool(const char* named, bool Val) {
pPS(named, Serial);
pEqOnOff(Val);
Serial.println();
}
void serialHandler() {
const byte sCBMax = 30;
static char sCBuffer[sCBMax];
static byte buffIndex = 0;
byte inChar;
bool doCheck = false;
while (Serial.available()) {
inChar = Serial.read();
if (inChar == 13) {
doCheck = true;
} else if (inChar != 10) {
if ((buffIndex == 0) && isWhitespace(inChar)) {
continue;
}
sCBuffer[buffIndex++] = inChar;
doCheck = (buffIndex == (sCBMax - 1));
}
if (doCheck) {
sCBuffer[buffIndex] = 0;
doCheck = false;
if (buffIndex != 0) {
processCmd(sCBuffer);
buffIndex = 0;
} else {
Serial.println();
}
}
}
}
Are there really errors in the TMRh20 driver?
I can not remember real errors in it, some omissions maybe.
NRF24Plus.zip (1.13 MB)
They are realy unreliable and probably this will be my last project with them. Its time to try LoRa 
And after adding little delay evrything works perfect