RadioHead / Airspayce issue

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benscammell

Well-known member
Hello All,

I have two custom teensy's with an RFM69 connected to them.

SERVER

Code: 
#include <SPI.h>
#include <RH_RF69.h>

// Singleton instance of the radio driver
RH_RF69 rf69(20, 2);

int led = 33;

void setup() 
{
  Serial.begin(9600);

  if (!rf69.init())
    Serial.println("init failed");
  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
  // No encryption
  
  if (!rf69.setFrequency(434.0))
    Serial.println("setFrequency failed");

  rf69.setModemConfig(RH_RF69::GFSK_Rb57_6Fd120);

  rf69.setPreambleLength(4);

  uint8_t syncwords[] = { 0x2d, 0xd4 };
  rf69.setSyncWords(syncwords, sizeof(syncwords));

  uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
  
  rf69.setEncryptionKey(key);

  pinMode(led, OUTPUT);
}

void loop()
{
  if (rf69.available())
  {
    // Should be a message for us now   
    uint8_t buf[RH_RF69_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);
    
    if (rf69.recv(buf, &len))
    {

      digitalWrite(led, HIGH);
      
      RH_RF69::printBuffer("request: ", buf, len);
      
      Serial.print("got request: ");
      Serial.println((char*)buf);
      Serial.print("RSSI: ");
      Serial.println(rf69.lastRssi(), DEC);

      // Send a reply
      uint8_t data[] = "And hello back to you";
      rf69.send(data, sizeof(data));
      rf69.waitPacketSent();
      Serial.println("Sent a reply");
    }
    else
    {
      Serial.println("recv failed");
    }
  }

  digitalWrite(led, LOW);
}

and CLIENT

Code: 
#include <SPI.h>
#include <RH_RF69.h>

// Singleton instance of the radio driver
RH_RF69 rf69(20, 2);

int led = 33;

void setup() 
{
  Serial.begin(9600);
  if (!rf69.init())
    Serial.println("init failed");

  if (!rf69.setFrequency(434.0))
    Serial.println("setFrequency failed");

  rf69.setModemConfig(RH_RF69::GFSK_Rb57_6Fd120);

  rf69.setPreambleLength(4);

  uint8_t syncwords[] = { 0x2d, 0xd4 };
  rf69.setSyncWords(syncwords, sizeof(syncwords));
  
  uint8_t key[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
                    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
  
  rf69.setEncryptionKey(key);

  pinMode(led, OUTPUT);
}


void loop()
{
  digitalWrite(led, HIGH);
  
  Serial.println("Sending to rf69_server");
  
  // Send a message to rf69_server
  uint8_t data[] = "Hello World!";
  rf69.send(data, sizeof(data));  
  rf69.waitPacketSent();
  
  // Now wait for a reply
  uint8_t buf[RH_RF69_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);

  if (rf69.waitAvailableTimeout(500))
  { 
    // Should be a reply message for us now   
    if (rf69.recv(buf, &len))
    {
      Serial.print("got reply: ");
      Serial.println((char*)buf);
    }
    else
    {
      Serial.println("recv failed");
    }
  }
  else
  {
    Serial.println("No reply, is rf69_server running?");
  }

  digitalWrite(led, LOW);

  delay(1000);
}

Here is the output I get from the SERVER

Code: 
request: 
58 75 7C 7C 7F 30 57 7F 72 7C 74 31 10 
got request: Xu||0Wr|t1��
RSSI: -40
Sent a reply

Here is the output I get from the CLIENT
Code: 
Sending to rf69_server
got reply: Q~t0xu||0rqs{0t0yu

Why are the messages getting corrupted?

Thank in advance to anyone that helps me out!

Cheers, Ben
 
I've worked with the RFM69 quite a bit.
this
rf69.setModemConfig(RH_RF69::GFSK_Rb57_6Fd120);

chooses a non-default modulation mode. I suggest starting with the default.
I've never needed to setup synch words; their integral to the radio module firmware.

Nor have I tried to use encryption.

Does it work with all defaults in use and no encrytption?
 
So basically removing the encryption fixes everything.

I feel stupid, I should have tried that, but it's in their basic example so I assumed it would work.

Thank you for your help Steve, I will reply on to the PM's shortly... we had an internal delay on decision making.

Thanks, Ben
 
Negotiated.
We agreed on a price for the first lot of systems that were not for resale (beta, friendly customers). IIRC, it was 50 or so units times 8 radios per device. Each device had many sensors and MCUs, and one radio per MCU. All battery powered. Fairly low cost but I shouldn't get detailed. Low cost mean it was fractionally prudent for the overall cost per device which was rather high.

It was for a stage performance that is to grow to many venues.

Personally, as well, I made a significant donation to Mike's account.
 
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