ESP32ASCIIPrinter/src/main.cpp

#include <ParallelPrinter.h>
#include <WiFi.h>
#include <WebServer.h>

WiFiServer server(21);
WiFiClient client;

#define wifi_ssid "dezentrale-2.4"
#define wifi_password "dezentrale"

ParallelPrinter PP;

bool wifi_connect()
{
  delay(5000);
  Serial.print("Connecting to ");
  Serial.println(wifi_ssid);

  WiFi.begin(wifi_ssid, wifi_password);
  static int timeout = 20;
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    if(timeout == 0)
    {
      Serial.println("Failed to connect: Timeout");
      return false;
    }
    timeout--;
    delay(500);
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("Local IP address: ");
  Serial.println(WiFi.localIP());
  return true;
}

void setup()
{
// put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println();

  if(wifi_connect())
  {
    server.begin();
    Serial.println("Telnet port = 21");
    Serial.println("Password: drucker");
  } else
  {
    Serial.println("Failed to connect.");
  }
  Serial.println();
  Serial.println();

  PP.begin(); // create connection to printer
}

bool clientAuthorized = false;
void loop()
{
// put your main code here, to run repeatedly:

  size_t bytes = 0;
  if (client.connected())
  {
    bytes = client.available();
    if (bytes)
    {
      if (clientAuthorized)
      {
        char buf[32];
        if (bytes > 32) bytes = 32;
        client.readBytes(buf,bytes);
        String line = client.readStringUntil('\n');
        //PP.println(buf,bytes);
        PP.println(line);
        Serial.write(buf,bytes);
        //Serial.print('\n');
      } else
      {
        String line = client.readStringUntil('\n');
        if(!strcmp("drucker",line.c_str())) // Passwordcheck
        {
          clientAuthorized = true;
          client.println("You are now logged in.");
        }
      }
    }
    size_t bytes = Serial.available();
    if(bytes)
    {
      char buf[32];
      if(bytes > 32) bytes = 32;
      Serial.readBytes(buf, bytes);
      //String s = Serial.readString();
      //client.print(s);
      client.write(buf,bytes);
    }
  } else
  {
    clientAuthorized = false;
    client = server.available();
    //send out password info
    client.println("Please enter password.");
  }
}