Dean_Bean:
I have been working with this tutorial by Robin2 (thanks a million btw, helped me so much). And I got a barebones communication between the two working one way but not the other.
Stick with the code in my Tutorial with no change that is not essential until you get the communication working.
Sorry, I have never tried to get an nRF24 working with an ESP8266.
If you are having a problem getting the NodeMCU to transmit then my first suspicion would be inadequate power for the nRF24. You have not said how you have everything wired up. Try using a pair of AA alkaline cells (3v) to power the nRF24 with the battery GND connected to the ESP8266 GND. Have you got a 10µF capacitor across Vcc and GND for the nRF24?
On the other hand, if the Arduino can send a message to the NodeMCU and get an acknowledgement it suggests that the NodeMCU is able to transmit.
...R