CCS/NDKTCPIP: tcp server support multiple clients

Hello user3511888,

Each of your TCP client creates socket on the NDK which allocates memory from BIOS heap.
The amount of memory needed for each socket/client depends on some parameters like TCP receive/transmit buffer size etc. Please check what size you are setting in your XDC config file. You would have something like below with may be different values.

Tcp.transmitBufSize = 8192;
Tcp.receiveBufSize = 8192;
Tcp.receiveBufLimit = 8192;
Udp.receiveBufSize = 8192;

Now as you are allocating only 200Kb (seen from ROV), to enable more than 11 clients you have to increase heap size.

Please search BIOS heap configuration (like below) and increase heap size.

/* create a default heap */
var HeapMem = xdc.useModule('ti.sysbios.heaps.HeapMem');
var heapMemParams = new HeapMem.Params();
heapMemParams.size = 0xA0000;


Other option is to decrease TCP buffer sizes which will allow more clients to be accommodated with current heap.

I think it is something  paraments is wrong.

Tcp.transmitBufSize = 1460;
Tcp.receiveBufSize = 1460;

Tcp.receiveBufLimit = 1460;

var BIOS = xdc.useModule('ti.sysbios.BIOS');

BIOS.heapSize =204800;

 tcp server only support  11  clients

and if modified 

Tcp.transmitBufSize = 1460;
Tcp.receiveBufSize = 1460;

Tcp.receiveBufLimit = 1460;

var BIOS = xdc.useModule('ti.sysbios.BIOS');

BIOS.heapSize =0xa0000;

it is wrong . the ram of my mcu(tm4c129ekcpd)  only 512kB .

 200Kb is Enough for more than 16 clients 

and if modified 

Tcp.transmitBufSize = 400;
Tcp.receiveBufSize = 400;

Tcp.receiveBufLimit = 400;

var BIOS = xdc.useModule('ti.sysbios.BIOS');

BIOS.heapSize =204800;

 tcp server only support  11  clients

and if modified 

Tcp.transmitBufSize = 8192;
Tcp.receiveBufSize = 8192;

Tcp.receiveBufLimit = 8192;

var BIOS = xdc.useModule('ti.sysbios.BIOS');

BIOS.heapSize =204800;

 tcp server only support  11  clients,too.

I think multiple clients is limited by some paraments,can you tell me ,what paraments i want to  modify

Hello,

How are you creating your TCP server? Are you using NDK DaemonNew?

If yes, call to daemonnew has one of argument as MaxSpawn which is "Maximum number of tasks which can be spawned to handle  the daemon". Can you check if it is limiting factor?

thank you for your answer, but  I cann't find " MaxSpawn",  can you tell where "MaxSpawn" .  

my code

**********************

.....

result = select(maxsock, &testfds, (fd_set *)0,(fd_set *)0, &timeout);

......

**********************

I think it related to "select()"  

typedef struct _fd_set {

   unsigned  int count;

   void     *fd[NDK_FD_SETSIZE];

} fd_set;

#define NDK_FD_SETSIZE 16

but I modified "socket.h" and "socketndk.h"

#define NDK_FD_SETSIZE 32

It is not succsess.

I debug project, I found problem,but I don't know how to change it, how to  rebuild "fileuser.c " for "select()"