Getting 404 error on server and client side says 'Disconnected'

[fawad-khalil]

When I try to connect to server the response is "GET / HTTP/1.1" 404 342 0.002334
I can connect to the server with another client code written in javascript using socketio but can't connect using Arduino. Please help me it's urgent.
I tested it with javascript sever code and python server code and same results.

[fawad-khalil]

GET /socket.io/?EIO=3&transport=polling&t=1474750479445-0 HTTP/1.1
Host: 192.168.8.102:5000
Accept: /
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6
Cookie: io=f1de310bb9bf48e2a3bb543b2435a653
DNT: 1
Origin: null
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

HTTP/1.1 200 OK
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: null
Connection: keep-alive
Content-Length: 119
Content-Type: application/octet-stream
Date: Sat, 24 Sep 2016 20:42:50 GMT
Set-Cookie: io=980653b7146d4c8595ca7f88369881f4

[fawad-khalil]

GET /socket.io/?EIO=3&transport=polling&t=1474750479505-1&sid=980653b7146d4c8595ca7f88369881f4 HTTP/1.1
Host: 192.168.8.102:5000
Accept: /
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6
Cookie: io=980653b7146d4c8595ca7f88369881f4
DNT: 1
Origin: null
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

HTTP/1.1 200 OK
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: null
Connection: keep-alive
Content-Length: 4
Content-Type: application/octet-stream
Date: Sat, 24 Sep 2016 20:42:50 GMT

[fawad-khalil]

These are the HTTP transfer when I traced them in my browser plugin when tried to connect to the same server using javascript client code and socketio

[fawad-khalil]

It seems that this:
"GET/socket.io/EIO=3&transport=polling&t=14747504795051&sid=980653b7146d4c8595ca7f88369881f4 HTTP/1.1"
is not in case of Arduino C code.
It's always: "GET / HTTP/1.1". And hence the 404 response from the server.

[Links2004]

socket.io is based on WebSockets, you need additional session handling.
may this helps:
https://github.com/Links2004/arduinoWebSockets/blob/master/examples/WebSocketClientSocketIO/WebSocketClientSocketIO.ino

how do your code looks like?

[fawad-khalil]

OK I solved it by modifying the url parameter in begin() function. The URL parameter in beginSocketIO() does not do the right thing.

[fawad-khalil]

Now I ran into another issue, not issue actually. how would I parse the payload from the server if Arduino is acting as a client. I need to know event type and the JSON string from the received payload.

[Links2004]

may https://gist.github.com/Links2004/25966845ed38278bb4a2f4a44b5a30fb
helps you its my socket.io client (for socket.io 0.9, with 1.0 they changed the protocol but I never update my projects since I not need any of changes they have done)

the message handling is stating here:
https://gist.github.com/Links2004/25966845ed38278bb4a2f4a44b5a30fb#file-socketioclient-cpp-L59
buffer to JSON:
https://gist.github.com/Links2004/25966845ed38278bb4a2f4a44b5a30fb#file-socketioclient-cpp-L140-L141

[fawad-khalil]

In your socket.io client there is a type SocketIO_msg_t can you please give me that class, also what does that means: [message id ('+')] ':' [message endpoint] ':' [json].

[Links2004]

SocketIO_msg_t:
https://gist.github.com/Links2004/25966845ed38278bb4a2f4a44b5a30fb#file-socketioclient-h-L61

 [message id ('+')] ':' [message endpoint] ':' [json]

is the protocol description of the socket.io version 0.9

[fawad-khalil]

How to retrieve this [json] from this protocol? I guess I would need this [json] part. Can't I do this using your public library WebsocketsClient. Your secret library SocketIO is giving me hard time to get understood and the time is running out.

[fawad-khalil]

When I use payload with index notation like payload[0] as you performed message type checking in your Socketio client library, my WiFi starts restarting after every connection.

[Links2004]

may this helps you:
https://github.com/bblanchon/ArduinoJson/blob/master/examples/JsonParserExample/JsonParserExample.ino
https://github.com/bblanchon/ArduinoJson

I use the same lib to decode json.
the basics are:

    DynamicJsonBuffer jsonBuffer;
    JsonObject& root = jsonBuffer.parseObject((char *) data);

where data points to the json string in the message (payload in the Websocket callback)

[Project-MAR]

@Fawadkhalil
I face this 404 error too. How you modifying the url parameter in begin() function.

[fawad-khalil]

Can you show me the debug trace from serial monitor? Are you trying to connect to socketio server?

[fawad-khalil]

by the way, just change the default parameter value of url as "/socket.io/?EIO=3" from "/" at
https://github.com/Links2004/arduinoWebSockets/blob/master/src/WebSocketsClient.h#L43

[Project-MAR]

I can fix the problem now. I want to use your code (web socket client side)
to connect with Tornado Web Server on RPi. The Problem is the url path is
not include in your code. So server/client will can not connect together.

I use your code with a little change "webSocket.begin("158.108.166.160",
8880, "/ws");" and then, problem solve

Thx, Ram

On Thu, Oct 20, 2016 at 3:44 PM, FawadKhalil notifications@github.com
wrote:

by the way, just change the default parameter value of url as "/
socket.io/?EIO=3" from "/" at
https://github.com/Links2004/arduinoWebSockets/blob/master/
src/WebSocketsClient.h#L43

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[Project-MAR]

You can visit my git here:
https://github.com/Project-MAR/RPI-ESP8266-TORNADO-SERVER

On Thu, Oct 20, 2016 at 3:53 PM, Atitep.Ram atitep.ram@gmail.com wrote:

I can fix the problem now. I want to use your code (web socket client
side) to connect with Tornado Web Server on RPi. The Problem is the url
path is not include in your code. So server/client will can not connect
together.

I use your code with a little change "webSocket.begin("158.108.166.160",
8880, "/ws");" and then, problem solve

Thx, Ram

On Thu, Oct 20, 2016 at 3:44 PM, FawadKhalil notifications@github.com
wrote:

by the way, just change the default parameter value of url as "/
socket.io/?EIO=3" from "/" at
https://github.com/Links2004/arduinoWebSockets/blob/master/s
rc/WebSocketsClient.h#L43

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You are receiving this because you commented.
Reply to this email directly, view it on GitHub
#124 (comment),
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https://github.com/notifications/unsubscribe-auth/AUWLI1molkK85QFB6iQmLV2HYOV0yVRcks5q1yn9gaJpZM4KFvV_
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[Links2004]

#142