ESP8266 Community Forum

Posted: **Fri Sep 04, 2020 10:47 pm**

Hi all!
I have the following issue with the code below,
I’m trying to store serial data to an array, then convert all the array to a string and then send it to the server. But I keep getting an error “non class type”

The divine I’m queuing responds one byte at a time. Any suggestions is appreciated!

Code: Select all

#include <ESP8266WebServer.h>
int incomingByte[13] ;       //array of data
String page1;
#define mdDeRe 14 // GPIO14 = D5  // sends signal to device.
ESP8266WebServer server(80);

void getdata1 (){
  digitalWrite(mdDeRe, HIGH);   /// enable receiver to receive data
  Serial.write(17);     ///// <<<---- maybe this can be written better
  Serial.write(3);
  Serial.write(0);
  Serial.write(84);
  Serial.write(0);
  Serial.write(4);
  Serial.write(7);
  Serial.write(73);
  Serial.flush();
  digitalWrite(mdDeRe,LOW);    //// enables device to send data


    //// store received bytes into an array /////
   if (Serial.available()) {
      for (int i=0; i<13; i ++){
      incomingByte[i] = Serial.read();
        }
      }  
  /// Here I would like to send the whole array to server
      page1 = incomingByte.toString();
      server.send(200, "text/plane",page1); //sends data to server
   }

Posted: **Sun Sep 06, 2020 2:01 am**

I don't see anything "Advanced" in this, but why you cannot use this:

Code: Select all

const uint8_t message[] = {17, 3, 0, 84, 0, 4, 7, 73};
...
Serial.write(message, sizeof(message));

Also your incomingByte[i] = Serial.read() is wrong - if you have not enough bytes in receive buffer, the Serial.read() method return -1

... Ugh - I hit Submit instead of Preview... So here is the missing part:

Code: Select all

  String result;

   if (Serial.available()) {
      for (int i=0; i<13; i ++){
          result.concat((char)Serial.read());
        }
    }
  /// Here I would like to send the whole array to server
    server.send(200, "text/plain", result); //sends data to server

Posted: **Sun Sep 06, 2020 11:09 pm**

Thank you for your Response as it has been a great help!
I'm really just learning as I go Along, and thanks to folks like this forum I'm this far.
But now I have a second Issue, with your code

Code: Select all

      if (Serial.available()) {
      for (int i=0; i<13; i ++){
          result.concat((char)Serial.read());
        }
    }
  /// Here I would like to send the whole array to server
    server.send(200, "text/plain", result); //sends data to server

This Gives as output on the html file :
(char) }>U)
But the expected output is: (hex) 11 03 08 00 7D 00 3E 00 OD 00 55 14 29
I'm thinking the rest of the bytes were ignored when converted to char. I compared it to ascii chart for example hex 11 = Char [Device control 1], hex 03= char [End of Text], 00= [null] and so on..
I have attached 2 images so you can review what I see on the html side!

response.jpg

and The Response

html.jpg

Posted: **Wed Sep 09, 2020 10:04 am**

This is not very complicated right? You can try for example this:

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      if (Serial.available()) {
      for (int i=0; i<13; i ++){
          uint8_t b = Serial.read();
          if (0 != result.length())
            result.concat(" "); // add space separator if we are not the first in line
          if (b < 0x10)
            result.concat("0"); // add leading 0 character if we are smaller than 0x10
          result.concat(String(b, HEX));
        }
    }
  /// Here I would like to send the whole array to server
    server.send(200, "text/plain", result); //sends data to server

ESP8266 Community Forum

How to store serial data to an array to be send to server?

How to store serial data to an array to be send to server?

Re: How to store serial data to an array to be send to serve

Re: How to store serial data to an array to be send to serve

Re: How to store serial data to an array to be send to serve