@kowshik1729 said in Error downloading package:

The license of the https://dl.espressif.com/dl/package_esp32_index.json might be expired(If this is the reason you can't do anything but just wait until they re-activate the license)

If the page liecence

It's good.

Ok, then you need to check the LM2596 output current and voltage!

@rafitc99 when powering with the LM2596 it's not sending message text right? but sending blank SMS right?

@rafitc99 When powering SIM800L through DC-DC buck alone it's sending a message right?

@rafitc99 Great, can you try this simple code that only includes the SMS sending part! if it's working fine with and without the computer connection we can look it to the other parts!

#include <SoftwareSerial.h>

//Create software serial object to communicate with SIM800L
SoftwareSerial mySerial(3, 2); //SIM800L Tx & Rx is connected to Arduino #3 & #2

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

  //Begin serial communication with Arduino and SIM800L
  mySerial.begin(9600);

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


}

void loop()
{

  mySerial.println("AT"); //Once the handshake test is successful, it will back to OK
  mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
  mySerial.println("AT+CMGS=\"+ZZxxxxxxxxxx\"");//change ZZ with country code and xxxxxxxxxxx with phone number to sms
  mySerial.print("SMS Test "); //text content
  updateSerial();
  mySerial.write(26);

  delay(7000);

}

@rafitc99 Ok, are you connecting all the ground as common in the circuit when using the LM2596 buck converter to power up the module/Arduino? and check the resistor that you are using stepdown Tx signal from Arduino to the SIM800L.!

Hi @rafitc99, May I know why you are using this same function definition with different function name?

void smsSend_1(String content) {

  detachInterrupt(CountPulses);
  Serial.println("SMS sending");
  mySerial.println("AT");
  updateSerial();
  mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
  updateSerial();
  mySerial.println("AT+CMGS=\"+ YYxxxxxxxxxx\"");//("AT+CMGS=\"" +number+ "\""); //change ZZ with country code and xxxxxxxxxxx with phone number to sms
  updateSerial();
  mySerial.print(content); //text content
  updateSerial();
  mySerial.write(26);
  Serial.println("sent!!");
  recSmsFlag = false; //Reset Rec SMS flag
}

void smsSend_2(String content) {
  //wdt_reset();
  detachInterrupt(CountPulses);
  Serial.println("SMS sending");
  mySerial.println("AT");
  updateSerial();
  mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
  updateSerial();
  mySerial.println("AT+CMGS=\"+ YYxxxxxxxxxx\"");//("AT+CMGS=\"" +number+ "\""); //change ZZ with country code and xxxxxxxxxxx with phone number to sms
  updateSerial();
  mySerial.print(content); //text content
  updateSerial();
  mySerial.write(26);
  Serial.println("sent!!");
  recSmsFlag = false; //Reset Rec SMS flag
}

void smsSend_3(String content) {

  detachInterrupt(CountPulses);
  Serial.println("SMS sending");
  mySerial.println("AT");
  updateSerial();
  mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
  updateSerial();
  mySerial.println("AT+CMGS=\"+ YYxxxxxxxxxx\"");//("AT+CMGS=\"" +number+ "\""); //change ZZ with country code and xxxxxxxxxxx with phone number to sms
  updateSerial();
  mySerial.print(content); //text content
  updateSerial();
  mySerial.write(26);
  Serial.println("sent!!");
  recSmsFlag = false; //Reset Rec SMS flag
}

@rafitc99 Can you share your code too!

@abdultechguy999 It looks like Arduino IDE having trouble to connect internet, can you try to download any other board from the board manager or library from the library manager!

@rafitc99 Can you share code and buck booster you are using?