ESP8266 Community Forum

Posted: **Tue Apr 25, 2017 1:04 pm**

I'm trying to compare every line of the HTTP response to change the state of a relay. I know it's not ideal and there are more elegant ways to do it but for the moment I just need a working prototype to test the module.

the code I have is this:

Code: Select all

// Read the entire response and flush it to Serial output
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
    if(!strcmp(line.c_str(),"OFF")){
      Serial.println(" -> True");
    } else {
      Serial.println(" ->  False");
    }

-> False is returned for everything

Code: Select all

Request sent - waiting for reply...
HTTP/1.1 200 OK -> False

Content-Type: text/html; charset=UTF-8 -> False

Content-Length: 3 -> False

Date: Tue, 25 Apr 2017 18:02:28 GMT -> False

Accept-Ranges: bytes -> False

Server: LiteSpeed -> False

Connection: close -> False

 -> False

OFF -> False

Connection closed.

Posted: **Tue Apr 25, 2017 1:17 pm**

it seems the string to compare it to is \nOFF as there's a new line in the response.

Code: Select allif(!strcmp(line.c_str(),"\nOFF")){

Posted: **Sat Apr 29, 2017 6:50 am**

That makes sense. Your client is send CR/LF to terminate lines (as is common in HTTP, indeed mandatory for headers), You are reading each line up to and including the CR, which leaves the NL still in the buffer to be read.

Posted: **Tue May 02, 2017 1:54 am**

Yea, I got it working with that

ESP8266 Community Forum

Using HTTP response to change relay state

Using HTTP response to change relay state

Re: Using HTTP response to change relay state

Re: Using HTTP response to change relay state

Re: Using HTTP response to change relay state