Making a PUT request with arduino ethernet

Projects Networking, Protocols, and Devices
1

I'm trying to send a JSON string via PUT from an arduino in order to control a philips Hue smart light. I've googled and found a lot about POST and GET, but not much on PUT. I'm attempting to PUT "{"on":false}" to my local Hue bridge (/api/hueuser/lights/1/state), but don't now how to format it. Can anyone help me out? Here's what I'm trying:

if (client.connect("192.168.1.8",80))
  {

   client.print("PUT /api/hueuser/lights/1/state HTTP/1.1");

   client.print("Host: 192.168.1.8\n");                          
    client.print("Connection: close\n");
 
    client.print("Content-Type: text/plain; charset=UTF-8\n");
    client.print("Content-Length: 12 \n ");

    client.print("{\"on\":false}\n");}
2

I haven't tried it, but this should work according to the protocol.

IPAddress server(192,168,1,8);

if (client.connect(server,80))
{
   client.println("PUT /api/hueuser/lights/1/state HTTP/1.1");
   client.println("Host: 192.168.1.8");                          
    client.println("Connection: close");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.println("Content-Length: 10\r\n");
    client.print("\"on\":false");
}

edit: Added missing semicolon in code.

3

Thanks for replying. I didn't have any success with your code, so I looked at the console of the Hue API tool, and here is the header info it uses:
Accept text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Encoding gzip, deflate
Accept-Language en-us,en;q=0.5
Connection keep-alive
Content-Length 12
Content-Type text/plain; charset=UTF-8
Host 192.168.1.8
Referer http://192.168.1.8/debug/clip.html
User-Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:12.0) Gecko/20100101 Firefox/12.0

So I changed the code to this, but still had no luck:

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


byte mac[]     = { 0x90, 0xA2, 0xDA, 0x0D, 0x83, 0x9D };

byte ip[]      = { 192, 168,   1,  199 }; 
byte gateway[] = { 192, 168,   1,  1 };   
byte subnet[]  = { 255, 255, 255,   0 };   



void setup()
{
  Ethernet.begin(mac, ip); 
 Serial.begin(9600); 
 delay(1000);
}
void loop()
{ 

 EthernetClient client;



IPAddress server(192,168,1,8);

if (client.connect(server,80))
{
   client.println("PUT /api/hueuser/lights/1/state HTTP/1.1");
   client.println("Host: 192.168.1.8");                          
    client.println("Connection: keep-alive");
    client.println("Content-Type: text/plain; charset=UTF-8");
    client.println("Content-Length: 12\r\n");
    client.print("\"on\":false");
    client.print("Referer: http://192.168.1.8/debug/clip.html");
}
  else
  {
    Serial.println("Connection Failed.");  
   Serial.println();
  }
 delay(5000); 
}
4

Does it use port 80?

5

It looks like you need to be sending a username and devicename too.

The following link seems to have some useful information on the API

6

You must complete the request by reading the response, then closing the connection. Maybe what the server sends will help you troubleshoot it.

if (client.connect(server,80))
{
   client.println("PUT /api/hueuser/lights/1/state HTTP/1.1");
   client.println("Host: 192.168.1.8");                          
    client.println("Connection: keep-alive");
    client.println("Content-Type: text/plain; charset=UTF-8");
    client.println("Content-Length: 12\r\n");
    client.print("\"on\":false");
    client.print("Referer: http://192.168.1.8/debug/clip.html");

    // read the server response
    while(client.connected()) {
        while(client.available()) {
            char ch = client.read();
            Serial.write(ch);
        }
    }

    // close the connection
    client.stop();      
    Serial.println("disconnected");
}
7

Hi,

I've been playing with this for some time because I wanted physical switches to control a few Hue lights. The current setup uses HT6P20B garage door remote controls and a 433.92MHz receiver to send commands to the Hue hub from an Arduino UNO with W5100 shield.

The 3 remote buttons can turn lights on/off and cycle through brightness and hue. You can see how it works at Hue_W5100_HT6P20B - YouTube.

The code is too large to post here, I saved it to github at oguime/Hue_W5100_HT6P20B

By the way, thanks Afonso for the HT6P20B code!

Regards,
Gilson

8

Old topic but it still helped me:

The only thing that was missing was

client.println("Content-Length: 12\r\n");
client.print("{\"on\":false}");

Notice the {}

if (client.connect(server,80))
{
  client.println("PUT /api/hueuser/lights/1/state HTTP/1.1");
  client.println("Host: 192.168.1.8");                          
  client.println("Connection: close");
  client.println("Content-Type: application/x-www-form-urlencoded");
  client.println("Content-Length: 10\r\n");
  client.print("{\"on\":false}");  
}

delay(10);

// Read all the lines of the reply from server and print them to Serial
while (client.available()) {
	String line = client.readStringUntil('\r');
    Serial.print(line);
}

Serial.println();
Serial.println("closing connection");
9

I came across this topic on my way of looking for a solution to turn on/off my DeConz controlled ZigBee lights via Arduino. After a lot of trial and error, this is the simplest solution I have found:

#include <ArduinoHttpClient.h>
char httpserverAddress[] = "192.168.0.2";  // server address
HttpClient httpclient = HttpClient(ethClient, httpserverAddress, port);

boolean ok=false;
unsigned long timestart=millis(); // save for 15 seconds timeout
while ( ok != true && (millis()-timestart) < 15000)
{
  delay(1000);
  Serial.println("Sending");
  httpclient.put("/api/BD0AB797F7/lights/32/state", "Content-Type: application/json", "{\"on\": true}");
  delay(20);
  Serial.println(F("CHECK Response"));
  String str = httpclient.readString();
  Serial.print(str);
  if (strstr(str.c_str(), "success") != NULL)
  {
    Serial.println("Success");
    ok=true;
  }
  else
  {
    delay(5000);
  }
}