Issue with values<=0xF in messages

[nimasaj]

There is a problem either in parsing in Sigfox module, or in the way data is sent to the Sigfox module. If you send a message in an array like following:

uint8_t msg[12]; msg[0]=76; //0x4C msg[1]=20; //0x14 msg[2]=13; //0xD //complete example below//

there would be a parsing error produced and your message will not be sent to Sigfox servers, due to msg[2]=13; //0xD. If you change it to msg[2]=16; //0x10 the issue will be resolved. It seems that this part is seen as a nibble instead of a byte, as long as the value is equal or less than F in HEX. The complete and simple example is as below.

#include <SoftwareSerial.h>

#define SF_rxPin 5     //Sigfox
#define SF_txPin 6     //Sigfox
boolean debug =  true;
uint8_t msg[12];

SoftwareSerial Sigfox =  SoftwareSerial(SF_rxPin, SF_txPin);  //((Module.Tx>>>MCU.Rx), (Module.Rx>>>MCU.Tx))

void setup() {
  pinMode(SF_rxPin, INPUT);
  pinMode(SF_txPin, OUTPUT);  
  if(debug){
    Serial.begin(9600);
  }
  Sigfox.begin(9600);
  delay(500);
  if(debug){
  Serial.println("Hello!");
  }  
}

void loop() {
  msg[0]=76; //0x4C
  msg[1]=20; //0x14
  msg[2]=13; //0xD
  if(debug){
    Serial.println(msg[0],HEX);
    Serial.println(msg[1],HEX);
    Serial.println(msg[2],HEX);
  }
  delay(20);

  sendMessage(msg, strlen(msg)); // Sending messages here
  delay(20*1000);
}

//Send Sigfox Message
void sendMessage(uint8_t msg[], int size){

  String status = "";
  char output;
  Sigfox.print("AT$SF=");
  for(uint8_t i= 0;i<size;i++){
    Sigfox.print(String(msg[i], HEX));
    if(debug){
      Serial.print("Byte:");
      Serial.println(msg[i], HEX);
    }
  }

  Sigfox.print("\n");

  while (!Sigfox.available()){
     //blink();
  }
  while(Sigfox.available()){
    output = (char)Sigfox.read();
    status += output;
    delay(10);
  }
  if(debug){
    Serial.println();
    Serial.print("Status \t");
    Serial.println(status);
  }
}

I also tried with the following message structure and nothing changed. The issue still exists.

#include <SoftwareSerial.h>

#define SF_rxPin 5     //Sigfox
#define SF_txPin 6     //Sigfox
boolean debug =  true;

SoftwareSerial Sigfox =  SoftwareSerial(SF_rxPin, SF_txPin);  //((Module.Tx>>>MCU.Rx), (Module.Rx>>>MCU.Tx))

typedef struct {
  uint8_t A;  //Value 1
  uint16_t B; //Value 2
} SigfoxMessage;
SigfoxMessage M;

void setup() {
  pinMode(SF_rxPin, INPUT);
  pinMode(SF_txPin, OUTPUT);  
  if(debug){
    Serial.begin(9600);
  }
  Sigfox.begin(9600);
  delay(500);
  if(debug){
  Serial.println("Hello!");
  }  
}

void loop() {
  M.A=76; //0x4C
  M.B=333; //0x14D
  if (debug) {
    Serial.println("Value1: "+String(M.A));
    Serial.println("Value2: "+String(M.B)+"\n");        
  }
  delay(20);
  send(&M, sizeof(M)); // Sending messages here
  delay(20*1000);
}

void send(const void* data, uint8_t size){
  uint8_t* bytes = (uint8_t*)data;
  if(debug){
    Serial.println("Message Size: " + String(size));
  }
  Sigfox.print("AT$SF=");
  for(uint8_t i= 0; i<(size); ++i){
    Sigfox.print(bytes[i], HEX);
    if(debug){
      Serial.print("Byte:");
      Serial.println(bytes[i], HEX);
    }
  }
  Sigfox.print("\n");//// \n or \r
}

In this way there is a limitation in sending different values and as long as the value is <= 0xF, there would be a problem. Is there a fix for this issue?

[nimasaj]

A solution is provided at https://github.com/adrien3d/IO_WSSFM10-Arduino/pull/8 and https://github.com/adrien3d/IO_WSSFM10-Arduino/pull/7

[nimasaj]

An example is available at https://github.com/adrien3d/IO_WSSFM10-Arduino/blob/master/examples/IoThings_WSSFM10_Demo_String/IoThings_WSSFM10_Demo_String.ino