Can't send SoftwareSerial to Class Object

Question

I have a problem when I try to use SoftwareSerial in a class..

Here my detail My class

class MyEsp8266
{
 protected: 
 SoftwareSerial *esp8266;
 public: 
 MyEsp8266(SoftwareSerial *_esp8266){
 esp8266 = _esp8266;
 }
 void begin(int baud){
 esp8266->begin(baud);
 }
 String testAT(){
 esp8266->println("AT");
 return esp8266->readString();
 }
}

My Arduino code

#include <SoftwareSerial.h>
#include "MyEsp8266.h"
// the setup function runs once when you press reset or power the board
SoftwareSerial _esp(10, 11);
MyEsp8266 wifi(&_esp);
void setup() {
 Serial.begin(9600);
 wifi.begin(115200);
 Serial.println(wifi.testAT());
}

It doesn't log anything But when I have used all code in Arduino code it worked.

#include <SoftwareSerial.h>
// the setup function runs once when you press reset or power the board
SoftwareSerial _esp(10, 11);
void setup() {
 Serial.begin(9600);
 _esp.begin(115200);
 _esp.println("AT");
 Serial.println(_esp.readString());
}

Thank any tips. Regards.

• Majenko: You forgot to print the return value of wifi.testAT();...?
• HoangHieu: it my mistake when post question I have updated it

Answer 1

This is more of a work-around than a solution, but the code you're trying to get to work, worked for me once I changed

wifi.begin(115200);

to

wifi.begin(9600);

(sorry I don't have enough karma to just comment)

• HoangHieu: Hi baud 115200 worked with secondary code.
• pizzaisdavid: I agree! and when testing your desired block of code, I got it to output the test line by changing the baud from 115200 to 9600.
• HoangHieu: I think that means your Wifi module use baud 9600.
• pizzaisdavid: To clarify, I was using the bluetooth HC-05 which a quick Google search tells me It can go up to 1382400. But besides, I tried both code samples, the second worked without modification (meaning my hardware can handle 115200) and then when I tried the first, and once I changed the baud to 9600 it worked. Did adjusting the baud rate on the first code sample not fix the problem for you?