ESP8266 Serial Interface

# ESP8266 Serial Monitor
This project is developed for ESP8266 boards and it functions as a **serial interface monitor**. Once you connect RX and TX lines (crossed) from this project to any device, that provides ASCII data over serial interface (**3.3V** for ESP8266 only!), you will see the communication over the lines. But that is not all:
### Features
* display incoming ASCII serial communication on OLED
* write messages and sent them over the serial interface
* change baud rate on the fly
* when connected to a wifi network, web page is provided, that shows the serial communication, enables writing new messages and changing the baud rate
* when connected to a wifi network, the project can connect to a MQTT broker and send all serial communication in the JSON format to the broker. MQTT interface also provides the posibility to change the baud rate and send messages

Project can be used in home automation systems for devices, that provide serial interface and cannot connect t