Wifi module configuration

[UnaiFernandez]

Create a c program to configure the ESP8266 module correctly. The USART configuration program is correctly implemented.

• [x] AT commands to configure the ESP-01 in the required way.
• [x] Create wifi code for arduino
• [x] Modify USART.c to send AT commands to the ESP module.
• [x] Create wifi.c & wifi.h
• [x] Ability to connect to more than one user
• [x] Documentation for wifi module configuration

[UnaiFernandez]

Create the program to configure the ESP8266 as AP and communicate via TCP with other aplication.

• [x] Wifi functions
  • [x] Send command
  • [x] Hello ESP
  • [x] AP setup
  • [x] ESP mode
  • [x] ESP multiple connections
  • [x] ESP server mode
  • [x] ESP server timeout
  • [ ] Timer for timeout
  • [x] Close TCP connection
  • [x] Send TCP message:w
  • [x] Receive TCP messages