event 'data' called twice?

[lesion]

Hi, I'm struggling with a little issue, hope you can help:

My setup is: an Arduino with RF24 library and a simple ping test program with this setup:

STATUS       = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1     = 0xabcdabcd71 0xc2c2c2c2c2
RX_ADDR_P2-5     = 0xc3 0xc4 0xc5 0xc6
TX_ADDR      = 0xabcdabcd71
RX_PW_P0-6   = 0x20 0x00 0x00 0x00 0x00 0x00
EN_AA        = 0x00
EN_RXADDR    = 0x03
RF_CH        = 0x48
RF_SETUP     = 0x27
CONFIG       = 0x0a
DYNPD/FEATURE    = 0x03 0x06
Data Rate    = 250KBPS
Model        = nRF24L01+
CRC Length   = 8 bits
PA Power     = PA_MAX

and a Raspberry PI B+ that should receive, with node-nrf and this setup:

SPI device:  /dev/spidev0.0
CE GPIO:     22
IRQ GPIO:    undefined
STATUS:      0xe RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
Recommend use with IRQ pin, fallback handling is suboptimal.
RX_ADDR_P0–1:  0xf0f0f0f0e1 0xabcdabcd71
RX_ADDR_P2–5:  0xe2 0xe3 0xf1 0xf2
TX_ADDR:     0xf0f0f0f0e1
RX_PW_P0–5:    0x8 0x8 0x8 0x8 0x8 0x8
EN_AA:       0x3f
EN_RXADDR:   0x02
RF_CH:       0x48
RF_SETUP:    0x27
CONFIG:      0x0b
DYNPD/FEATURE:   0x02 0x07
Data Rate:   250kbps
Model:       nRF24L01+
CRC Length:  8 bits
PA Power:    PA_MAX

they are talking nice, but for each packet sent from arduino the 'data' event on 'rx' pipe is called twice and the second time the message is the first char repeated N times where N is the payload size. so for example if the string 30921 is sent from arduino, on raspberry I see:

DATA EVENT 
30921   
DATA EVENT 
33333333

with this code:

  radio.channel(72)
    .dataRate('250kbps')
    .crcBytes(1)
    .transmitPower('PA_MAX')
    .autoRetransmit({count:15, delay:15000});

  radio.begin(function () {
    rx = radio.openPipe('rx', 0xABCDABCD71);
    rx.on('data',function(data){
      console.log("DATA EVENT ");
      console.log(data.toString());
    });
  });

tried with RF24 C library and the packet is received correctly. any suggestion?

sorry for my english and thanks for your work!

[natevw]

This sounds a lot like https://github.com/natevw/node-nrf/issues/30, and I see you also are not using hardware IRQ pin? The workaround for now is to connect hardware IRQ pin, but I hope to fix the software fallback with the work in progress on https://github.com/natevw/node-nrf/pull/32

Thanks for the report, and please let me know if this can be closed as a duplicate of the other.

[atomicus]

Yep, it's exactly what I came with in #30, just connect interrupt pin and will work fine.