Good day
I have an ESP8266 running the WiFiTelnetToSerial original exampleWiFiTelnetToserial example sketch, which was uploaded using the Arduino IDE.
WiFiTelnetToSerial original example.
I am able to send it the following using PuTTY : 1234,12,123,999 and the data is received correctly in the serial console on the server.
What must be changed in the following code (hopefully it's the correct place in the example's code) in order to split the received data on the commas into char array variables?
//get data from the telnet client and push it to the UART
while(serverClients[i].available()) Serial.write(serverClients[i].read());
As far as I can see, once the client is connected successfully (based on MAX CLIENT = the current client number stored in serverClients*) , the data from the client is read like this :*
serverClients[i].read() and the passed onto Serial.write. Serial.write(serverClients[i].read());
What is the correct format/method to place the data from here,
* *Serial.write(serverClients[i].read());* *
Into this for example ? :
* *char A char B char C char D* *
so that each Char would contain each value:
char A would hold value 1234
char B would hold value 12
char C would hold value 123
char D would hold value 999
other examples show using readStringUntil() :
So I tried this but then the server refuses any connection to it:
* *//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()); String line = client.readStringUntil('\r'); Serial.println(); Serial.print(line); Serial.println(); char myarray[21]; line.toCharArray(myarray, 21); Serial.print(myarray[0]); Serial.print(' '); Serial.print(myarray[1]); Serial.print(' ');* *
Attaching the WiFiTelnetToSerial example here for extra reference:
```
/
WiFiTelnetToSerial - Example Transparent UART to Telnet Server for esp8266
Copyright (c) 2015 Hristo Gochkov. All rights reserved.
This file is part of the ESP8266WiFi library for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ESP8266WiFi.h>
//how many clients should be able to telnet to this ESP8266
#define MAX_SRV_CLIENTS 1
const char* ssid = "";
const char password = "*";
WiFiServer server(23);
WiFiClient serverClients[MAX_SRV_CLIENTS];
void setup() {
Serial1.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial1.print("\nConnecting to "); Serial1.println(ssid);
uint8_t i = 0;
while (WiFi.status() != WL_CONNECTED && i++ < 20) delay(500);
if(i == 21){
Serial1.print("Could not connect to"); Serial1.println(ssid);
while(1) delay(500);
}
//start UART and the server
Serial.begin(115200);
server.begin();
server.setNoDelay(true);
Serial1.print("Ready! Use 'telnet ");
Serial1.print(WiFi.localIP());
Serial1.println(" 23' to connect");
}
void loop() {
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();
Serial1.print("New client: "); Serial1.print(i);
break;
}
}
//no free/disconnected spot so reject
if ( i == MAX_SRV_CLIENTS) {
WiFiClient serverClient = server.available();
serverClient.stop();
Serial1.println("Connection rejected ");
}
}
//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);
}
}
}*
```
