EC200U-CN LTE 4G GPS GNSS Mini Industrial Modem

IoT Modules LTE Standard Module
1

I am not getting the output for the following code when I am trying to implement the below code to find and send an SMS to a particular phone number my location in url format:

#include <SoftwareSerial.h>

SoftwareSerial ec200uSerial(10, 11); // RX, TX for EC200U module

void setup() {
Serial.begin(9600);
ec200uSerial.begin(9600);

Serial.println(“Initializing EC200U…”);
delay(1000);
ec200uSerial.println(“AT”);
waitForResponse();

ec200uSerial.println(“AT+CMGF=1”); // Set SMS mode to text
waitForResponse();
}

void loop() {
String location = getLocation();
if (location.length() > 0) {
String message = "Location: " + location;
sendSMS(message);
}
delay(60000); // Wait for 1 minute before sending next SMS
}

String getLocation() {
ec200uSerial.println(“AT+QGPS=1”); // Turn on GPS
if (waitForResponse()) {
delay(2000); // Wait for the GPS to get a fix
ec200uSerial.println(“AT+QGPSLOC?”); // Request GPS location
if (waitForResponse()) {
String response = ec200uSerial.readString();
int latStart = response.indexOf(“:”) + 2;
int latEnd = response.indexOf(“,”, latStart);
String latitude = response.substring(latStart, latEnd);

  int lngStart = response.indexOf(",", latEnd + 1) + 1;
  int lngEnd = response.indexOf(",", lngStart);
  String longitude = response.substring(lngStart, lngEnd);
  
  return "https://maps.google.com/?q=" + latitude + "," + longitude;
}

}
return “”;
}

void sendSMS(String message) {
ec200uSerial.println(“AT+CMGS="+1234567890"”); // Replace with your mobile number
delay(1000);
ec200uSerial.print(message);
delay(1000);
ec200uSerial.write(26); // ASCII code for CTRL+Z to send the message
delay(1000);
Serial.println("SMS sent: " + message);
}

bool waitForResponse() {
long timeout = millis() + 5000; // 5 seconds timeout
while (millis() < timeout) {
if (ec200uSerial.available()) {
String response = ec200uSerial.readString();
Serial.println(response);
if (response.indexOf(“OK”) != -1) {
return true;
}
}
}
return false;
}

I am getting the output as this:
Initializing EC200U
AT
OK

AT+CMGF=1?OK

AT+QGPS=1?+CMS ERROR: 504

AT+QGPS=1
+CMS ERROR: 504

AT+QGPS=1
+CMS ERROR: 504