AW: [lwip-users] Re: More help with socket

[Mathias Zenger]

Some thoughts:

 

Your application should accept incoming requests so let's call it the server. I would suggest to start out with a single TCP connection to get familiar with the topic. As a simple example you could use the TCP echo server (socket programming) found at http://www.ultimaserial.com/classroom2.html

 

What your server task basically needs:

 

- implement a new task

- create a socket: socket()

- bind it to the local address: bind()

- set socket to listen mode: listen()

- accept incoming requests: accept()

- answer the request: send()

 

As soon as you get the example working you can go ahead with the other connections. Either you implement a seperate task for each socket you need or you could start more than one instance of the above task (e.g. pass the internet address and socket number as function parameters to your portTASK_FUNCTION).

 

To get familiar with FreeRTOS I recommend to purchase and read Richard Barry's book (http://www.freertos.org/Documentation/FreeRTOS-documentation-and-book.html)

Some information to get familiar with the BSD sockets interface from a link found at lwIP Wiki (http://docs.hp.com/en/B2355-90136/)

 

Regards,

Mathias

 

 

-----Ursprüngliche Nachricht-----
Von: address@hidden [mailto:address@hiddenIm Auftrag von Oscar F
Gesendet: Dienstag, 8. September 2009 20:12
An: Mailing list for lwIP users
Betreff: [lwip-users] Re: More help with socket

The second part is not correct because always my task have the control and another task never enter.
can i use the select option? with TCP connection and another idea to listen about three socket and blocking while there isn´t data?

Thanks again
Oscar

On Tue, Sep 8, 2009 at 7:59 PM, Oscar F <address@hidden> wrote:

I know more data about the application. The connection is TCP, and i have to open 6 socket, all of them unidirectional , 3 for request and 3 for response.

Logical links connection sequence

logical links connection process shall be initiated by the PC unit: it will connect sequentially (one after the other) all the logical links.

At power-on/reset, the EVK1100 application shall first create the sockets in order to be ready for accepting a connection in all of them.

my first question is the function accept is blocking the code, because i´ll do of this way

-createsockets( ) (the six socket)

-bind( ) the six socket

-listen ( ) the six socket

and then

do {

-accept ( ) for socket one

if the answer is OK

-accept () for the second one

if the answer is OK

...

-accept () for the six one

if the answer is OK then fin=true

}while (fin)

 

is that correct?

the next step is listen for 3 socket to request and this is my idea:

do{

if recv(socke1)

 {

  //process

}

if recv(socket2)

 {

  //process

}

if recv(socket3)

 {

  //process

}

}while (fin2)

is a good idea?

thanks for all

Oscar