Esp-01 is connected to wifi but blynk shows that the system is offline

[PeteKnight]

@Bittu

#define ESP8266_BAUD 115200

Your Arduino Uno’s processor isn’t fast enough to emulate a serial port operating at this speed using the SoftwareSerial library.

SoftwareSerial ports shouldn’t be uses for speeds higher than 9600 baud on the Uno.
Both the Uno and the ESP-01 need to be communicating at the same baud rate for this to work correctly, so your ESP-01 needs to be configured to use 9600 baud too.

You should be looking at the serial monitor output of the Uno to understand what is happening with the connection attempts to Blynk.

You should read this for more info…

Understanding hardware and software serial ports

I’m still seeing frequent posts, mostly from new members of the forum, who are confused about how to add WiFi or Bluetooth connectivity to devices like the Arduino Uno, Nano or Mega, or from people who are trying to use serial communication with some other type of peripheral. I thought I’d try to put together some guidance on how to do this properly. First things first though – if you’re using a device such as an Uno, Nano or Mega that doesn’t have built-in internet connectivity then you shoul…

Pete.