SerialTransfer between two Arduinos not working

[Riemanndiy]

I'm using the library SerialTransfer to send an integer between two arduino unos. The problem is that the receiver is receiveng the data, but it's displaying 0 everytime..

Here below there is my code:

TX

#include "SerialTransfer.h"
#include <SoftwareSerial.h>
SoftwareSerial s(3,2); //Rx, Tx

SerialTransfer myTransfer;

struct STRUCT {
  int num;
  //int negnum;
} testStruct;

int randnum;

void setup() {
  Serial.begin(9600);
  s.begin(9600);
  myTransfer.begin(s);
}

void loop() {
  randnum = 10 + random(1,15);
  
  testStruct.num = randnum;


  myTransfer.txObj(testStruct, sizeof(testStruct));
  myTransfer.sendData(sizeof(testStruct));


  Serial.print(testStruct.num); //Serial.println(testStruct.negnum);
  delay(500);
}

RX

#include "SerialTransfer.h"
#include <SoftwareSerial.h>
SerialTransfer myTransfer;

struct STRUCT {
  int num;
  //int negnum;
} testStruct;

SoftwareSerial s(3,2); //Rx, Tx

void setup() {
  Serial.begin(9600);
  s.begin(9600);
  myTransfer.begin(s);
}

void loop() {
    if(myTransfer.available()) {
      myTransfer.rxObj(testStruct, sizeof(testStruct));
      Serial.print("number positive: "); Serial.print(testStruct.num); //Serial.print("number negative: "); Serial.println(testStruct.negnum);
    }
    else if(myTransfer.status <0) {
      Serial.print("ERROR");
      Serial.println(myTransfer.status);
    }
}

Why is this happening? How can I fix this?

[ruilviana]

Have you connected

Arduino1 Arduino2
RX ------------> TX
TX ------------> RX
and both GND together ?

RV mineirin

[groundFungus]

I tried the code with 2 Unos and get the same results. I do not know how to fix the code. I use code based on the serial input basics tutorial. The methods are not hidden in a library in that tutorial code. I believe that the tutorial teaches the basics of serial comms better, but that's me.

[ruilviana]

Hi, try this sketchs.
Here it worked correctly;

RV mineirin

// Transmiter

#include "SerialTransfer.h"
#include <SoftwareSerial.h>
SoftwareSerial s(3, 2); //Rx, Tx

SerialTransfer myTransfer;

struct STRUCT {
  int num;
} testStruct;

int randnum;

void setup() {
  Serial.begin(9600);
  s.begin(9600);
  myTransfer.begin(s);
}

void loop() {
  randnum = 10 + random(1, 15);
  testStruct.num = randnum;
  
  uint16_t sendSize = 0;

  sendSize = myTransfer.txObj(testStruct, sendSize);

  myTransfer.sendData(sendSize);
  delay(500);
}

// Receiver

#include "SerialTransfer.h"
#include <SoftwareSerial.h>
SerialTransfer myTransfer;

struct STRUCT {
  int num;
} testStruct;

SoftwareSerial s(3,2); //Rx, Tx

void setup() {
  Serial.begin(9600);
  s.begin(9600);
  myTransfer.begin(s);
}

void loop() {
    if(myTransfer.available()) {
    uint16_t recSize = 0;

    recSize = myTransfer.rxObj(testStruct, recSize);
    Serial.println(testStruct.num);

    }
    else if(myTransfer.status <0) {
      Serial.print("ERROR");
      Serial.println(myTransfer.status);
    }
}