Serial Monitor displays half of ASCII Logo ScheduledWiFiSSLWebClient Tutorial

Projects Programming
1

Hello guys,

I basically copied the whole sketch for the ScheduledWiFiSSLWebClient Tutorial. (https://www.arduino.cc/en/Tutorial/ScheduledWiFiSSLWebClient) The goal is to access the Arduino website via WiFi, fetch the ASCII logo, and display an ASCII version of the Arduino Logo in the serial monitor. However, I can never get it to display the FULL logo as shown in the address itself:https://www.arduino.cc/asciilogo.txt. It always cuts off about halfway.

I'm trying to fetch data from a public transport departure website with the same but modified code but again, I can never get the full source code of the website to be displayed in serial monitor. I am pretty sure that this problem is exactly the same as the one i faced in the tutorial mentioned above.

I would appreciate some advice as I am new and I have searched for similar issues everywhere but to no avail. Thanks in advance.

Edit: This is how it looks like if I copy the code and paste it into my IDE. Obviously the lower part of the logo is cut off.

Request sent @ 17:01:01

HTTP/1.1 200 OK
Date: Tue, 16 Apr 2019 22:08:38 GMT
Content-Type: text/plain
Content-Length: 2263
Connection: close
Server: nginx
Last-Modified: Wed, 02 Oct 2013 13:46:47 GMT
Vary: Accept-Encoding
ETag: "524c23c7-8d7"
Access-Control-Allow-Origin: https://www.arduino.cc
Access-Control-Allow-Credentials: true
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Headers: Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Mx-ReqToken,X-Requested-With
Accept-Ranges: bytes


           `:;;;,`                      .:;;:.           
        .;;;;;;;;;;;`                :;;;;;;;;;;:     TM 
      `;;;;;;;;;;;;;;;`            :;;;;;;;;;;;;;;;      
     :;;;;;;;;;;;;;;;;;;         `;;;;;;;;;;;;;;;;;;     
    ;;;;;;;;;;;;;;;;;;;;;       .;;;;;;;;;;;;;;;;;;;;    
   ;;;;;;;;:`   `;;;;;;;;;     ,;;;;;;;;.`   .;;;;;;;;   
  .;;;;;;,         :;;;;;;;   .;;;;;;;          ;;;;;;;  
  ;;;;;;             ;;;;;;;  ;;;;;;,            ;;;;;;. 
 ,;;;;;               ;;;;;;.;;;;;;`              ;;;;;; 
 ;;;;;.                ;;;;;;;;;;;`      ```       ;;;;;`
 ;;;;;                  ;;;;;;;;;,       ;;;       .;;;;;
`;;;;:                  `;;;;;;;;        ;;;        ;;;;;
,;;;;`    `,,,,,,,,      ;;;;;;;      .,,;;;,,,     ;;;;;
:;;;;`    .;;;;;;;;
2

You might want to wait after available() tells you there is nothing left to read.. you might just have emptied the buffer faster than the data was coming in. Try to stick around And test if there is something to read while the client is connected

3

First of all really appreciate the reply.

Secondly, I inserted a

Serial.print(client.available());

in the line before the

while ((millis() - startTime < 5000) && !received) { //try to listen for 5 seconds

and it prints out a 0. Does it mean then that it somehow has no more bytes to read? I'm sorry I would need a more detailed explanation on what exactly to do. Thanks in advance.

4

Look at the doc for client.connected()

5

It worked! Thanks a lot! I replaced client.available() with client.connected() and it displayed everything.

Only another issue that has arisen is that there seems to be some mirrored question marks here and there, especially the big chunk at the beginning of the output. Any ideas as to what might have caused that? (This is for retrieving data from the public transport website, not the arduino logo)

Request sent @ 00:18:01

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Date: Tue, 16 Apr 2019 23:25:00 GMT
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6

You need to test both - as long as the client is connected, wait for something to become available and when there is data, read it and print it.

The thing you want also to do is to get read of the HTTP header. That means after you send the request you have to wait for an empty line. ie you ignore the data until you have received “\r\n\r\n” (or as some system still don’t send both “\n\n” (easiest way to do this is ignore the \r and test for two consecutive \n, if you search the web you’ll see plenty of code for doing this and testing for empty line

That marks the end of the HTTP header and then what comes after that is your web page content