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This is an under-construction first revision of the firmware:

/*
  Garg10n3 Firmware 1.0 ALPHA
  Copyright (c) 2010 Alfred Pennarini
  https://www.dbmo.tk/
 */


//RC Control Pins
int left = 7;
int right = 6;
int back = 5;
int forward = 4;
//Other Pins
int aux1 = 8;
int aux2 = 9;
int aux3 = 10;
int buzzer = 11;
int irLeds = 12;
int leds = 13;
// DD-WRT user-ID,password,serial-speed settings
#define USER_ID "root"
#define PASSWD "admin"
#define SERIAL_SPEED 115200
//Server IP and TCP-Port Listening settings
#define SERVER "192.168.10.129"
#define PORT "5555"
//Setup Function
void setup()
{
  Serial.begin(SERIAL_SPEED);
  login();    //login DD-WRT
  connect();  //connects to the server
  digitalWrite(buzzer,HIGH);
  delay(500);
  digitalWrite(buzzer,LOW);
}
//Loop Function
void loop()
{
  if(Serial.available()>0){
   int receivedData = Serial.read(); //read out data from the Server
   if(receivedData =='A')
   {
     //forward
   }
  }
}

/* login to DD-WRT */
void login()
{
  Serial.print("¥n");
  allflush(); // flushing serial read buffer
  Serial.println(USER_ID);
  delay(500);
  Serial.println(PASSWD);
  allflush();
}  

/* logoff from DD-WRT */
void logoff()
{
  Serial.print("¥x03"); //CTRL+C
  delay(100);
  Serial.println("exit");
  allflush();
}

//Connection to the Server
void connect()
{
  Serial.print("¥x03¥n¥n"); //CRTL+C,LF,LF
  allflush();
  //telnet to Processing-Server
  Serial.print("telnet ");
  Serial.print(SERVER);
  Serial.print(" ");
  Serial.println(PORT);
  allflush();
  //telnet change "character mode".  cf: DD-WRT telnet command
  Serial.print("¥x03"); //CTRL+C
  Serial.print("c");
  allflush();
  Serial.print("¥n");
  allflush();
  //send first data to Processing-Server. first data is 0
  Serial.println("0");  //send 0
}