A7670C not giving response

[rgaur_90624]

I am getting "Timeout without expected Response" result with A7670C module when connected with Arduino UNO.

Wiring:
VIN of module connected to 5V of Arduino. Module is getting power and LED is blinking.
TX of module connected to pin 2 of UNO. And RX of module to pin 3 of UNO. And GND to GND.

#include <SoftwareSerial.h>

SoftwareSerial SIM7670Serial(2, 3); // RX, TX

void sendATCommand(const char* cmd, const char* expectedResponse, unsigned long timeout) {
  SIM7670Serial.println(cmd);
  String response = "";
  response.reserve(50);
  unsigned long startTime = millis();
  bool responseOK = false;

  while (millis() - startTime < timeout) {
    while (SIM7670Serial.available() > 0) {
      char c = SIM7670Serial.read();
      response += c;
    }
    if (response.indexOf(expectedResponse) != -1) {
      responseOK = true;
      break; // found it
    }
  }
  Serial.println(response);

  if (responseOK)
    Serial.println("Response OK");
  else
    Serial.println("Timeout without expected Response");

}

void setup() {
  Serial.begin(115200);
  SIM7670Serial.begin(9600);
  sendATCommand("AT", "OK", 1000); // check communication
}

void loop() {}