Read messagge with Sim800L v.2

[Riccio99]

Hi all i need to read messagge reiceved using a Sim800L v.2.

I have setup the sim800l v.2 and i can recevie and send message.

When i receive messages this is what i receive:

12:20:14.969 -> +CMT: "+39XXXXXXXXXX","","22/09/19,11:20:08+04"
12:20:15.017 -> 86
12:20:15.017 ->

i need only to read the "86" (it could be another number it is not always 86) and put it in a variable.

This is how i read message:

void loop()
{
  updateSerial();
}

void updateSerial()
{

  delay(500);
  while (Serial.available())
  {
    sim.write(Serial.read());//Forward what Serial received to Software Serial Port

  }
  while (sim.available())
  {
    String sms = sim.readString();
    Serial.println(sms);
     }
 }
Please can someone help me?

Thank you

[UKHeliBob]

Welcome to the forum

Read the serial input and discard it until you get a Carriage Return, then use Serial.parseInt() or Serial.parseFloat() depending in data type, to read the value into a String

[b707]

In general, it would be more correct to come up with some kind of protocol instead of sending a bare number. Something like "value=86" instead of just 86
Single number is very easy to confuse with some service message

[Riccio99]

Hi, this is what i try:

{

  delay(500);
  while (Serial.available())
  {
    sim.write(Serial.read());//Forward what Serial received to Software Serial Port

  }
  while (sim.available())
  {
    Serial.write(sim.read());
    String sms = sim.readString();
    Serial.println(sms);
    {
        str = sim.readStringUntil('\n');
        x = Serial.parseInt();
    }
    Serial.println(str);


  }
}
`but i don't receive nothing str and x``

[b707]

@Riccio99

    Serial.write(sim.read());
    String sms = sim.readString();
    Serial.println(sms);
    {
        str = sim.readStringUntil('\n');
        x = Serial.parseInt();

All of this:
sim.read()
sim.readString()
sim.readStringUntil()

read from port... So you try to extract one message three times. You should select ONLY ONE method for it.

And this

x = Serial.parseInt();

is fully non-understandable for me
Why do you try to extract value from Serial, if you receive it from "sim" port?

[b707]

I would recommend that you read this guide first:

Serial Input Basics - updated

Updated Version Please note that this is a revised version of the advice in this earlier Thread which has become very long. As far as possible I have kept the code examples identical or simplifed them slightly. It should not be necessary to refer to the older Thread, but feel free to do so. Contents The following sections are in this Tutorial Introduction Serial data is slow by Arduino standards Example 1 - Receiving single characters Why code is organized into functions Exampl…

[UKHeliBob]

@b707

Why do you try to extract value from Serial, if you receive it from "sim" port

I would speculate that the SIM899 is connected to a Serial port of some kind but as @Riccio99 has not posted a complete sketch let alone a schematic we can only gutess

[Riccio99]

Thank you all for your time.

this is the full sketch:

#include <SoftwareSerial.h>

SoftwareSerial sim(10, 11);

void setup()
{
  //Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
  Serial.begin(9600);
 
  //Begin serial communication with Arduino and SIM800L
  sim.begin(9600);

  Serial.println("Initializing...");
  delay(1000);

  sim.println("AT"); //Once the handshake test is successful, it will back to OK
  updateSerial();
  sim.println("AT+CSQ"); //Signal quality test, value range is 0-31 , 31 is the best
  updateSerial();
  sim.println("AT+CCID"); //Read SIM information to confirm whether the SIM is plugged
  updateSerial();
  sim.println("AT+CREG?"); //Check whether it has registered in the network
  updateSerial();

  sim.println("AT+CMGF=1"); // Configuring TEXT mode
  updateSerial();
  sim.println("AT+CNMI=1,2,0,0,0"); // Decides how newly arrived SMS messages should be handled
  updateSerial();

}

void loop()
{
  updateSerial();


}

void updateSerial()
{

  delay(500);
  while (Serial.available())
  {
    sim.write(Serial.read());//Forward what Serial received to Software Serial Port

  }
  while (sim.available())
  {
    String sms = sim.readStringUntil('\n');
    Serial.println(sms);
    //int index = sms.indexOf(';');
    //String message = sms.substring(index);
    //Serial.println(message);

  }
}

[Riccio99]

Thank you all for your time i solved the problem using the gsm library.

Thnak you