Sending array of type unsigned long

[Shiu Kumar]

Hello,

I want to send an array that is of type unsigned long. Any hints on how this can be done.

I managed to send arrays of type uint8_t via a single packet but not sure how to go about doing the same for the above.

Regards

[Mike McCauley]

Hello,


There is an example of how to do this in the examples:

nrf24_ping_client.pde
nrf24_ping_server.pde

Cheers.

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Mike McCauley mi...@open.com.au
Open System Consultants Pty. Ltd
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[Shiu Kumar]

The example does show how to send and receive unsigned long values, but I cannot get it working when i send a array of type unsigned long.

The codes are as follows:

Cleint Code:

void setup() 

{

  Serial.begin(9600);

  if (!nrf24.init())

    Serial.println("NRF24 init failed");

  // Defaults after init are 2.402 GHz (channel 2)

  // Now be compatible with Mirf ping_server

 if (!nrf24.setChannel(1))

    Serial.println("setChannel failed");

  if (!nrf24.setThisAddress((uint8_t*)"clie1", 5))

    Serial.println("setThisAddress failed");

  if (!nrf24.setPayloadSize(sizeof(unsigned long)))

    Serial.println("setPayloadSize failed");

  if (!nrf24.setRF(NRF24::NRF24DataRate2Mbps, NRF24::NRF24TransmitPower0dBm))

    Serial.println("setRF failed");    

  Serial.println("initialised");

}

// With printing commented and delay removed, this can achieve about 666 round trips per second

void loop()

{

//  Serial.println("send");

  

  // Send some data to the server

  if (!nrf24.setTransmitAddress((uint8_t*)"serv1", 5))

    Serial.println("setTransmitAddress failed");

  unsigned long time[2];

  time[1] = millis();

  delay(2);

  time[2] = millis();

  if (!nrf24.send((uint8_t*)time, sizeof(time)))

      Serial.println("send failed");  

   if (!nrf24.waitPacketSent())

      Serial.println("waitPacketSent failed"); 

}

Sever Code:

void setup() 

{

  Serial.begin(9600);

  if (!nrf24.init())

    Serial.println("NRF24 init failed");

  // Defaults after init are 2.402 GHz (channel 2)

  // Now be compatible with Mirf ping_client

 if (!nrf24.setChannel(1))

    Serial.println("setChannel failed");

  if (!nrf24.setThisAddress((uint8_t*)"serv1", 5))

    Serial.println("setThisAddress failed");

  if (!nrf24.setPayloadSize(sizeof(unsigned long)))

    Serial.println("setPayloadSize failed");

  if (!nrf24.setRF(NRF24::NRF24DataRate2Mbps, NRF24::NRF24TransmitPower0dBm))

    Serial.println("setRF failed");    

  Serial.println("initialised");

}

void loop()

{

//  Serial.println("waiting");

  nrf24.waitAvailable();

  // ping_client sends us an unsigned long containing its timestamp

  unsigned long data[2];

  uint8_t len;

  if (!nrf24.recv((uint8_t*)data, &len))

    Serial.println("read failed");

}

The headers are included in my code, I have just not included them here. Any suggestions what is wrong.

Regards

[Mike McCauley]

Hello,

In the receiver, you have to initialise the value of len to be the available
space:

unsigned long data[2];
uint8_t len = sizeof(data);

if (!nrf24.recv((uint8_t*)data, &len))
Serial.println("read failed");

[Shiu Kumar]

Hello,

Thanks, I will also try that. But I managed to get it working by setting a fixed payload.

Cheers