How to send an AT command and get response via WiFi?

[powerbroker2]

How to send an AT command and get response via WiFi?

[ext2ext]

It's updated, try it again

Perfect! Now it works how I expect.
Thank you so much!

[PowerBroker2]

I have a successful connection to my OBD dongle

What do you mean by that? How do you know?

but could not get a response on my 'AT Z' command using a terminal program. I use ESP8266_WiFi.ino.

Are you using an ESP8266? What response does it give when you type in AT Z? How are you sending AT commands when ESP8266_WiFi.ino doesn't support this?

Also, are you doing this testing with your car on and running?

[ext2ext]

I have a successful connection to my OBD dongle
What do you mean by that? How do you know?
I just powered up my OBD scanner at home. It creates a WiFi network and I got IP address using your ESP8266_WiFi.ino example (see log above).

but could not get a response on my 'AT Z' command using a terminal program. I use ESP8266_WiFi.ino.
Are you using an ESP8266?
Yes, I am. ESP8266 01.

What response does it give when you type in AT Z?
Nothing. Expecting FW version in the response.

How are you sending AT commands when ESP8266_WiFi.ino doesn't support this?
That why I'm asking about it. I see that guys did it successful using your BT example.
Used Arduino's Serial monitor and another terminal software.

Also, are you doing this testing with your car on and running?
My experiments are going without a car. I want to work with the configuration of elm327 chip. On my understanding it should respond to me without a car connection. In my mind, It should work as "any PC (W10) terminal program -> COM port -> USB to RS232 TTL UART adapter -> ESP8266 -> WiFi network -> ELM327 chip".

[PowerBroker2]

Ok, I think I understand what you're trying to do now. The code that was being referred to was for an ESP32 connected to an ELM327 over standard bluetooth. Instead, you'll need to use a sketch similar to this:

#include <ESP8266WiFi.h>
#include "ELMduino.h"


const char* ssid = "WiFi_OBDII";
const char* password = "your-password";


//IP Adress of your ELM327 Dongle
IPAddress server(192, 168, 0, 10);
WiFiClient client;
ELM327 myELM327;


uint32_t rpm = 0;


void setup()
{
  Serial.begin(115200);

  // Connecting to ELM327 WiFi
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid);
  // WiFi.begin(ssid, password); //Use this line if your ELM327 has a password protected WiFi

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("Connected to Wifi");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  if (client.connect(server, 35000))
    Serial.println("connected");
  else
  {
    Serial.println("connection failed");
    ESP.reset();
  }

  myELM327.begin(client);

  Serial.println("Connected to ELM327");
  Serial.println("Ensure your serial monitor line ending is set to 'Carriage Return'");
  Serial.println("Type and send commands/queries to your ELM327 through the serial monitor");
  Serial.println();
}


void loop()
{
  if(Serial.available())
  {
    char c = Serial.read();

    Serial.write(c);
    client.write(c);
  }

  if(client.available())
  {
    char c = client.read();

    if(c == '>')
      Serial.println();

    Serial.write(c);
  }
}

Let me know if you can get AT responses using the above code. If it works, I'll add it to the examples in the library.

[ext2ext]

You lost the declaration:
ESP8266_WiFi:65:5: error: 'ELM_PORT' was not declared in this scope

[PowerBroker2]

It's updated, try it again