initial add

Author: arkypita

README.md

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+
+`1.`  Download and install Arduino IDE 1.6.x from https://www.arduino.cc/en/Main/Software
+
+`2.`  Install ESP8266 Arduino support https://github.com/esp8266/Arduino#installing-with-boards-manager
+
+`3.`  Install the following libraries:
+
+`3.1:`  WifiManager: https://github.com/tzapu/WiFiManager#install-through-library-manager
+
+`4.` Configure your ESP8266 for sketch upload (GIPOs pulled up and down accordingly, USB to serial connected, reset and ready for upload)
+
+`5.`  Upload the Sketch contained in telnetserver folder
+
+`6.`  Connect the TX of the ESP8266 to RX of grbl arduino board, and RX of the ESP8266 to TX. Power up the ESP and engraver
+
+`7.`  Connect to the ESP8266 AP to connect the ESP to your local Wifi, then switch back to your local wifi (Animation below shows the details)
+
+`8.` In LaserGRBL open menu "grbl-settings" and configure for LaserWebESP8266 protocol and connect to the IP of the ESP (Note, I will add an IP scanner soon. For now, check on your DHCP server which IP was dished out)
+
+![Setting Up Wifi](wifibridge.gif)
+
+
+NOTE: To reset the Wifi settings you can Send `WIFIRESET` via websocket

telnetserver/telnetserver.ino

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+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <Hash.h>
+#include <DNSServer.h>
+#include <ESP8266WebServer.h>
+#include <ESP8266HTTPUpdateServer.h>
+#include <WiFiManager.h>         //https://github.com/tzapu/WiFiManager
+
+ESP8266WebServer httpServer(80);
+ESP8266HTTPUpdateServer httpUpdater;
+const char* update_path = "/firmware";
+const char* update_username = "admin";
+const char* update_password = "admin";
+
+
+#define MAX_SRV_CLIENTS 1
+WiFiServer server(23);
+WiFiClient serverClients[MAX_SRV_CLIENTS];
+
+int RESET_PIN = 0; // = GPIO0 on nodeMCU
+WiFiManager wifiManager;
+
+void setup()
+{
+	Serial.begin(115200);
+	            
+    delay(5000); //BOOT WAIT
+    pinMode(RESET_PIN, INPUT_PULLUP);
+    wifiManager.autoConnect("ESP8266");
+
+	server.begin();
+	server.setNoDelay(true);
+
+    httpUpdater.setup(&httpServer, update_path, update_username, update_password);
+    httpServer.begin();
+
+    WiFi.setSleepMode(WIFI_NONE_SLEEP); // disable WiFi sleep for more performance
+}
+
+
+void loop()
+{
+    httpServer.handleClient();
+    manage();
+}
+
+void manage() {
+  uint8_t i;
+  //check if there are any new clients
+  if (server.hasClient()){
+    for(i = 0; i < MAX_SRV_CLIENTS; i++){
+      //find free/disconnected spot
+      if (!serverClients[i] || !serverClients[i].connected()){
+        if(serverClients[i]) serverClients[i].stop();
+        serverClients[i] = server.available();
+        serverClients[i].write("Connected\n");
+        continue;
+      }
+    }
+    //no free/disconnected spot so reject
+    WiFiClient serverClient = server.available();
+    serverClient.stop();
+  }
+  //check clients for data
+  for(i = 0; i < MAX_SRV_CLIENTS; i++){
+    if (serverClients[i] && serverClients[i].connected()){
+      if(serverClients[i].available()){
+        //get data from the telnet client and push it to the UART
+        while(serverClients[i].available()) Serial.write(serverClients[i].read());
+      }
+    }
+  }
+  //check UART for data
+  if(Serial.available()){
+    size_t len = Serial.available();
+    uint8_t sbuf[len];
+    Serial.readBytes(sbuf, len);
+    //push UART data to all connected telnet clients
+    for(i = 0; i < MAX_SRV_CLIENTS; i++){
+      if (serverClients[i] && serverClients[i].connected()){
+        serverClients[i].write(sbuf, len);
+        delay(1);
+      }
+    }
+  }
+}