104 lines
3.3 KiB
Arduino
104 lines
3.3 KiB
Arduino
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/*
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WiFiTelnetToSerial - Example Transparent UART to Telnet Server for esp8266
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Copyright (c) 2015 Hristo Gochkov. All rights reserved.
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This file is part of the WiFi library for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <WiFi.h>
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//how many clients should be able to telnet to this ESP8266
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#define MAX_SRV_CLIENTS 1
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const char* ssid = "**********";
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const char* password = "**********";
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WiFiServer server(23);
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WiFiClient serverClients[MAX_SRV_CLIENTS];
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void setup()
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{
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Serial1.begin(115200);
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WiFi.begin(ssid, password);
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Serial1.print("\nConnecting to ");
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Serial1.println(ssid);
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uint8_t i = 0;
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while (WiFi.status() != WL_CONNECTED && i++ < 20) {
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delay(500);
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}
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if(i == 21) {
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Serial1.print("Could not connect to");
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Serial1.println(ssid);
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while(1) {
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delay(500);
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}
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}
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//start UART and the server
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Serial.begin(115200);
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server.begin();
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server.setNoDelay(true);
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Serial1.print("Ready! Use 'telnet ");
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Serial1.print(WiFi.localIP());
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Serial1.println(" 23' to connect");
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}
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void loop()
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{
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uint8_t i;
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//check if there are any new clients
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if (server.hasClient()) {
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for(i = 0; i < MAX_SRV_CLIENTS; i++) {
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//find free/disconnected spot
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if (!serverClients[i] || !serverClients[i].connected()) {
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if(serverClients[i]) {
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serverClients[i].stop();
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}
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serverClients[i] = server.available();
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Serial1.print("New client: ");
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Serial1.print(i);
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continue;
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}
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}
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//no free/disconnected spot so reject
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WiFiClient serverClient = server.available();
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serverClient.stop();
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}
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//check clients for data
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for(i = 0; i < MAX_SRV_CLIENTS; i++) {
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if (serverClients[i] && serverClients[i].connected()) {
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if(serverClients[i].available()) {
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//get data from the telnet client and push it to the UART
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while(serverClients[i].available()) {
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Serial.write(serverClients[i].read());
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}
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}
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}
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}
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//check UART for data
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if(Serial.available()) {
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size_t len = Serial.available();
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uint8_t sbuf[len];
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Serial.readBytes(sbuf, len);
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//push UART data to all connected telnet clients
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for(i = 0; i < MAX_SRV_CLIENTS; i++) {
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if (serverClients[i] && serverClients[i].connected()) {
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serverClients[i].write(sbuf, len);
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delay(1);
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}
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}
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}
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}
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