Hi,
As
a continuation to my earlier mail…
Where
do you call tcpServer_send ??
In
tcpecho_raw_init function you call function tcp_new_ip_type
I am not familier with this function ?
My
init function looks like this:
struct
tcp_pcb *Listening_pcb; // is define static global
void
TcpTermInit(u16 TcpTermPort)
{
struct tcp_pcb *pcb;
err_t err;
pcb
= tcp_new();
if(pcb
!= NULL)
{
//
bind local IP with our port
err = tcp_bind(pcb, IP_ADDR_ANY, TcpTermPort);
if(err
== ERR_OK)
{
// The tcp_listen() function returns a new connection
control block, and
//
the one passed as an argument to the function will be
deallocated. The
//
reason for this behavior is that less memory is needed for a
connection
//
that is listening, so tcp_listen() will reclaim the memory
needed for
//
the original connection and allocate a new smaller memory
block for the
//
listening connection.
Listening_pcb
= tcp_listen(pcb);
//
if we are here that mean that we did not use all available
connection
// and we are ready to treat another one.
tcp_setprio(Listening_pcb, TCP_PRIO_MIN);
tcp_accept(Listening_pcb,
tcp_term_accept);
}
else
{
/* abort? output diagnostic? */
}
}
else
{
/* abort? output diagnostic? */
}
}
BR,
Noam.
From:
lwip-users
[mailto:address@hidden]
On Behalf Of Julio Cesar Aguilar Zerpa
Sent: Monday, October 31, 2016 11:00 AM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Tcp Server on Texas
Instrument RM57
Hi Noam,
Thank you for helping me.
1. First of all are you running with an OS or without?
I am using the RM57 Microprocessor -> without OS
2. Secondly do you understand that with RAW API you should
not call any LwIP if the call is not from within the LwIP
own context?
That is a very important point that I didn't know about!
So, then how should I send data? How do I initialize the pbuf
pointer?
3. As far as I see you are not copying the data into the
new buffer. How is the send itself? does the function
tcpecho_raw_send
copying the data to the buffer?
Yes, you are right. I noticed that. I then tried it
with "TEST_DATA" as global. Same problem (but at least the
data was correct at
tcpecho_raw_send)
4. The code is just partial so I cannot see the picture
You can see the code if you have the examples. It's
the 'tcpecho_raw'. I will attach it just in case you don't
have it. I made some minor modifications to check if there's a
connection and also added the function already described.
(Again: the 'echo' part works -> received data is being
sent back correctly, but sending data that wasn't
received is not working)
5. Secondly check if tcp_write uses the copy mode into an
internal buffer or use a reference to data.
Yes, it uses the copy mode.
I also tried to send the data using the 'tcp_write' function
directly instead of calling
tcpecho_raw_send
and it returned error -11 (no connection) but was receiving
and sending data over the callbacks.
It appears your second statement is one of the reason my
program is not working. I don't have any current docu, do you
have any?
How do I send data? Is there another example that receives
data over callbacks and is able to send data created on its
own memory space?
Best regards,
Julio
Am 29.10.2016 um 02:04 schrieb Noam
Weissman:
Hi,
First
of all are you running with an OS or without ?
Secondly
do you understand that with RAW API you should not call
any LwIP
if
the call is not from within the LwIP own context ?
As
far as I see you are not copying the data into the new
buffer. How is the send itself ?
does
the function tcpecho_raw_send copying
the data to the buffer ?
RAW
API means that everything you do is in the same context.
If you block on the function
tcpecho_raw_send and/or do
something that takes too much time yes the data will not
properly
handled.
The
code is just partial so I cannot see the picture.
I
would start with setting your
uint8
data[] = "TEST_DATA";
to static OUTSIDE of the function. This way
it
will not change when you exit from the function.
Secondly
check if tcp_write uses the copy mode into an internal
buffer or use a reference to data.
BR,
Noam.
Hi
there,
I am trying to use the LwIP library (1.4.1) to
create a simple tcp
server on a Texas Instrument RM57.
So far, I could make the "tcpecho_raw" example to
work using an static ip.
I also added the following function (which did not
work), to be able to
send data that wasn't an echo:
void tcpServer_send()
{
uint8 data[] = "TEST_DATA";
struct pbuf* buffer = pbuf_alloc(PBUF_RAW,
sizeof(data), PBUF_POOL);
if (buffer)
{
sciDisplayText(sciREG1, txt_new_line,
sizeof(txt_new_line));
sciDisplayText(sciREG1, "buffer created",
sizeof("buffer
created"));
buffer->tot_len = sizeof(data);
buffer->len = sizeof(data);
buffer->payload = data;
tcpecho_es->p = buffer;
tcpecho_raw_send(tcpecho_raw_pcb,
tcpecho_es);
}
}
As you can see, the function prints a debug msg
("buffer created"). I
modified the function 'tcpecho_raw_send' to also
print a debug msg (the
data being sent).
When I run the program, I can see the msg "buffer
created" every time
the function is called, but the msg from
'tcpecho_raw_send' comes only
when I close the client! (And the msg is missing the
acutal data, btw).
NOTE: I want to build a server that receives some
commands and sends a
block of data (4KB) every 60 ms. I am using the raw
API because I don't
want to use blocking functions (from what I
understood the netconn API
uses blocking functions).
I would appreciate any help.
Best regards,
Julio Aguilar
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i.A. Julio Cesar Aguilar Zerpa
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