HC-12 commands not communicating

Projects Networking, Protocols, and Devices
1

Folks,
I have connected an HC-12 transceiver to an Arduino Nano using pins 10 and 11 for the TX and TX connections. I also connect the set pin on the HC-12 to ground to put it in command mode. I uploaded the following code and brought up the serial monitor. The serial monitor indicates "Enter T commands:.
Typing in AT at the monitor prompt and hitting enter, I do not get back the expected okay on the monitor. The baud rate appears to be correct at 9600. Can someone please help? Thanks.
Brian

//HC-12 AT Commander
//Autor Tom Heylen tomtomheylen.com
//The HC-12 commander mode runs at baud rate 9600

#include <SoftwareSerial.h>

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

void setup() {
  Serial.begin(9600);
  Serial.println("Enter AT commands:");
  mySerial.begin(9600);
}

void loop(){
  if (mySerial.available()){
    Serial.write(mySerial.read());
  }
  if (Serial.available()){
    mySerial.write(Serial.read());
  }
}
2

Its because you are typing the commands and its taking too long.
The AT command parser expects the commands to be sent with no delay between the chars.
Send the commands directly from the program and not by typing them into the program.

eg serial.write ("AT ");

will respond with "OK"

3

Mauried,
In this video Long range, 1.8km, Arduino to Arduino wireless communication with the HC-12 - YouTube at 5:09 he types in AT in the monitor and it responds with okay. How does this work?
Brian

4

Send the commands directly from the program and not by typing them into the program.

eg serial.write ("AT ");

AT commands should be interactive; so that, we can change the settings as needed.