nRF24l01, Arduino and Pi - delay

Projects Programming
7

Here:

if(radio.write(msg, sizeof(int)))
      {
          Serial.println(msg[0]); 
      }
      else
      {
          Serial.println("Failed!"); 
      }

It looks like the first packet is sent - radio.write() returns true and my Pi receives a packet - and for all the rest (after the first delay) radio.write() is false - and Pi doesn't receive anything.