Parse a raw data from TCP/IP server

[cnsat1]

Hi,

I have to connect Arduino to a specific TCP/IP port and parse the streaming data received.

Basically I have a server that outputs continuously strings like the following:

Dec  4 2020 11:32:20.304 THD:  42.3  42.2  42.2  42.3  42.3
Dec  4 2020 11:32:23.008 +PLN: 283.6  42.4   2.6
Dec  4 2020 11:32:05.159 +ACTIVE: 00000000 00000000

Every string of course finish with CR and it contains a data that I have to parse (for example the value after +PLN).

I know that I should first create a Ethernet.client connection than collect the strings and Parse it.

But the tests done are unsuccessful.

Any Suggestion?

Thank you

[UKHeliBob]

Have you got as far as being able to receive the data and store each character in a line in an array as it is received ?

[Juraj]

I think I can help you, but show us some code

[cnsat1]

This is the code I'm using.

#include <SPI.h>
#include <Ethernet.h>

String id = "id";
String state = "State/";

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};

char server[] = "192.168.86.54";


EthernetClient client;

String readString = "";
String newString ="";
void setup()
{
  Ethernet.begin(mac);
  Serial.begin(9600);
  Serial.println("Connecting...");

  if (client.connect(server, 3000))
  {
    Serial.println("Arduino connected with TCP server");
    char deviceConnected[25];
    id.toCharArray(deviceConnected, 25);
    client.write(deviceConnected);
    delay(1000);
  }
  else
  {
    Serial.println("Connection failed.");
    delay(1000);
    setup();
  }
}

void loop()
{
    while (client.connected())
    {
      while (client.available())
      {
        char c = client.read();
        readString += c;

          if(readString.indexOf("+PLN") >= 0) {
            //Serial.println(readString); //prints string to serial port out
            int pos1 = readString.indexOf(':');
            int pos2 = readString.indexOf('.');

            newString = readString.substring(pos1+1, pos2+2);
            Serial.print("PLN is: ");
            Serial.println(newString);
          readString = "";
        }
      
      }
    }

    Serial.println();
    Serial.println("Disconnecting.");
    client.stop();
    delay(1000);
    Serial.println("Disconnected.");
    setup();
}

[Juraj]

the readString will contain +PLN before the rest of the line is read

[cnsat1]

sorry, I don't understand what you mean. Basically It works but after few seconds it stops