P2P RN2903/RN2483 Arduino

[phippstech]

Hi,

So I have gotten a little farther in my LoRa knowledge. I think I managed to get a Gateway set up. But now I am having trouble with P2P comm between two modules. I set up two RN2903 modules with Arduino’s using this setup:

How to build your first TTN node: Arduino + RN2483

There is a lot of information distributed across this forum on how to build nodes for TTN. I’m going to summarize how I built my first TTN node using an Arduino Uno and an RN2483 radio module. See this as a “How to get started” tutorial for first time builders. There are a lot of things this design can improve on, but this is at least a good place to start. What you will need: Arduino Uno (an Arduino Nano, or any other ATmega 328p, or Arduino compatible board should work too) Microchip RN248…

My “Send” Code is:

#include <SoftwareSerial.h>

SoftwareSerial loraSerial(10, 11);

String str;

void setup() {
  //output LED pin
  pinMode(13, OUTPUT);
  led_off();
  
  // Open serial communications and wait for port to open:
  
  Serial.begin(9600);
  
  loraSerial.begin(9600);
  loraSerial.setTimeout(1000);
  lora_autobaud();
  
  led_on();
  delay(1000);
  led_off();

  Serial.println("Initing LoRa");
  
  loraSerial.listen();
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  loraSerial.println("sys get ver");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("mac pause");     // Activates P2P transmission between the modules 
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
//  loraSerial.println("radio set bt 0.5");
//  wait_for_ok();
  
  loraSerial.println("radio set mod lora");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set freq 915000000");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set pwr 14");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set sf sf7");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set afcbw 41.7");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set rxbw 125");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
//  loraSerial.println("radio set bitrate 50000");
//  wait_for_ok();
  
//  loraSerial.println("radio set fdev 25000");
//  wait_for_ok();
  
  loraSerial.println("radio set prlen 8");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set crc on");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set iqi off");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set cr 4/5");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set wdt 60000"); //disable for continuous reception
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set sync 12");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set bw 125");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);

  Serial.println("starting loop");
}

void loop() {
  led_on();
    

  loraSerial.println("radio tx 6C6F"); 		//This line does the actual transmission. 6C6F is the data packet in HEX 
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  led_off();
  delay(2000);
}

void lora_autobaud()
{
  String response = "";
  while (response=="")
  {
    delay(1000);
    loraSerial.write((byte)0x00);
    loraSerial.write(0x55);
    loraSerial.println();
    loraSerial.println("sys get ver");
    response = loraSerial.readStringUntil('\n');
  }
}

/*
 * This function blocks until the word "ok\n" is received on the UART,
 * or until a timeout of 3*5 seconds.
 */
int wait_for_ok()
{
  str = loraSerial.readStringUntil('\n');
  if ( str.indexOf("ok") == 0 ) {
    return 1;
  }
  else return 0;
}

void led_on()
{
  digitalWrite(13, 1);
}

void led_off()
{
  digitalWrite(13, 0);
}

and my Receive code is:

#include <SoftwareSerial.h>

SoftwareSerial loraSerial(10, 11);

String str;
char e  ;

void setup() {
  //output LED pin
  pinMode(13, OUTPUT);
  //led_off();
  
  // Open serial communications and wait for port to open:
  
  Serial.begin(9600);
  
  loraSerial.begin(9600);
  loraSerial.setTimeout(1000);
  lora_autobaud();
  
  led_on();
  delay(1000);
  led_off();

  Serial.println("Initing LoRa");
  
  loraSerial.listen();
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  loraSerial.println("sys get ver");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("mac pause");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set bt 0.5");
 wait_for_ok();
  
  loraSerial.println("radio set mod lora");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set freq 915000000");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set pwr 14");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set sf sf7");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set afcbw 41.7");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set rxbw 125");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set bitrate 50000");
wait_for_ok();
  
 loraSerial.println("radio set fdev 25000");
 wait_for_ok();
  
  loraSerial.println("radio set prlen 8");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set crc on");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set iqi off");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set cr 4/5");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set wdt 0"); //disable for continuous reception
 str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set sync 12");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
  
  loraSerial.println("radio set bw 125");
  str = loraSerial.readStringUntil('\n');
  Serial.println(str);
}

void loop() {
  //Serial.println("waiting for a message");
  loraSerial.println("radio rx 0"); //continous reception
 
   char e = loraSerial.read();
         //  if (loraSerial.available() > 0) {

   
 // }
 
//  

  str = loraSerial.readStringUntil('\n');
  if ( str.indexOf("ok") == 0 )
  {
    str = String("");
    while(str=="")
    {
 
      str = loraSerial.readStringUntil('\n');
    }
    if ( str.indexOf("radio_rx") == 0 ) {

          Serial.print("packet: ");
    Serial.println(e,HEX);

      toggle_led();
    }
    else
    {
      Serial.println("Received nothing");
    }


  }
  else
  {
    Serial.println("radio not going into receive mode");
    delay(1000);
  }

 
}
void lora_autobaud()
{
  String response = "";
  while (response=="")
  {
    delay(1000);
    loraSerial.write((byte)0x00);
    loraSerial.write(0x55);
    loraSerial.println();
    loraSerial.println("sys get ver");
    response = loraSerial.readStringUntil('\n');
  }
}

/*
 * This function blocks until the word "ok\n" is received on the UART,
 * or until a timeout of 3*5 seconds.
 */
int wait_for_ok()
{
  str = loraSerial.readStringUntil('\n');
  if ( str.indexOf("ok") == 0 ) {
    return 1;
  }
  else return 0;
}

void toggle_led()
{
  digitalWrite(13, !digitalRead(13));
}

void led_on()
{
  digitalWrite(13, 1);
}

void led_off()
{
  digitalWrite(13, 0);
}

All I get is:
packet: FFFFFFFF

Any ideas?

[BoRRoZ]

start by reading… How do I format my forum post?
we don’t like big chunks of copy/pasted code… you can also link to github for example.

Also don’t try to write a ‘tutorial’ if you have yourself little knowledge of the subject, there is a lot of good information on this forum, just use search.
P2P communication between 2 nodes using LoRa has nothing to do with LoRaWAN.

topic closed