Using this repository you can bridge a serial connection over wifi using an ESP8266-esp01. The code in this repository is ment to be uploaded on the ESP. The esp can used in 2 ways:

1. CLIENT: In this configuration, the esp connects to a tcp server whose ip is sent by the serial device.

2. SERVER: In this configuration, the esp create a server and accepts one and only one client.

Connection configuration on the serial device:

/*
* Preconditions: Connect your arduino serial port to the esp serial port.
* This program will send to ESP the informations to connect to a wifi network and a server.
* After that, the arduino's serial port will be linked to the server on the other side
*/

#include <Arduino.h>
#define ENABLE_SERVER 1
#define ENABLE_CLIENT 0
#define ENABLE_SSDP 1


#define ESP_INIT_SEQUENCE "%SERIAL2WIFI\r\n"
#define ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING '%'

#define WIFI_SSID "Off Limits"
#define WIFI_PASSWORD "J7s2tzvzKzva"
#define HOST_IPADDRESS "192.168.0.247"
#define HOST_PORT 6789

#define SSDP_ENABLE_STRING "ENABLE_SSDP"
#define SSDP_DEVICETYPE "urn:schemas-upnp-org:device:MediaServer:1"
#define SSDP_NAME "name"
#define SSDP_SERIALNUMBER "Serial Number"
#define SSDP_MODELNAME "Model Name"
#define SSDP_MODELNUMBER "Model Number"
#define SSDP_MODELURL "Model URL"
#define SSDP_MANUFACTURER "Manufacturer"
#define SSDP_MANUFACTURERURL "Manufacturer URL"

#if ENABLE_SERVER == 1
  #define CONFIGURATION "SERVER"
#endif

#if ENABLE_CLIENT == 1
  #define CONFIGURATION "CLIENT"
#endif

void setup() {
  Serial.begin(230400);
  while (!Serial){
    delay(100);
  }
  delay(2000);
  Serial.print(ESP_INIT_SEQUENCE);
  Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(CONFIGURATION));
  Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(WIFI_SSID));
  Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(WIFI_PASSWORD));
  #if ENABLE_CLIENT == 1
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(HOST_IPADDRESS));
  #endif
  Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(HOST_PORT));

  #if ENABLE_SSDP == 1
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_ENABLE_STRING));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_DEVICETYPE));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_NAME));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_SERIALNUMBER));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_MODELNAME));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_MODELNUMBER));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_MODELURL));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_MANUFACTURER));
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String(SSDP_MANUFACTURERURL));
  #else
    Serial.println(ESCAPED_CHARACTER_AT_BEGINNING_OF_STRING + String("DISABLE_SSDP"));
  #endif
}

void loop() {
  Serial.println("Hello world"); // this message will be sent to the ESP via serial communication and the ESP will forward it to the server
  delay(1000);
}