I'd like to make TCP/IP communication with DHCP on freeRTOS.

[EHa.1]

Hi everyone.

I would like to know how to use DHCP and check if DHCP is working what I expected.

Please, confirm my process for using TCP/IP communication with DHCP on freeRTOS.

First, I make CubeMX configuration.

Like this, I make DHCP_Module enable.

And then, I put TCP/IP echo server C code on RTOS.

Below I attach the TCP/IP echo server thread C code.

/* USER CODE END Header_tcp_echo_server */
void tcp_echo_server(void const * argument)
{
  /* USER CODE BEGIN tcp_echo_server */
	struct netconn *conn, *newconn;
		err_t err, accept_err;
		struct netbuf *buf;
		void *data;
		u16_t len;
		LWIP_UNUSED_ARG(argument);
 
		/* Create a new connection identifier. */
		conn = netconn_new(NETCONN_TCP);
		if (conn!=NULL)
		{
			/* Bind connection to well known port number 7. */
			err = netconn_bind(conn, NULL, 7);
 
		    if (err == ERR_OK)
		    {
		    	/* Tell connection to go into listening mode. */
		    	netconn_listen(conn);
		    	/* Infinite loop */
		    	for(;;)
		    	{
		    		/* Grab new TCP connection. */
	  	    		accept_err = netconn_accept(conn, &newconn);
	  	    		/* Process the new connection. */
	  	    		if (accept_err == ERR_OK)
	  	    		{
	  	    			while (netconn_recv(newconn, &buf) == ERR_OK)
	  	    			{
	  	    				do
	  	    				{
	  	    					netbuf_data(buf, &data, &len);
	  	    					netconn_write(newconn, data, len, NETCONN_COPY);
	  	    				}
	  	    				while (netbuf_next(buf) >= 0);
	  	    				netbuf_delete(buf);
	  	    			}
	  	    	        /* Close connection and discard connection identifier. */
	  	    	        netconn_close(newconn);
	  	    	        netconn_delete(newconn);
	  	    		}
		    	}
		    }
		    else
		    {
		    	netconn_delete(newconn);
		    }
		}
  /* USER CODE END tcp_echo_server */
}

Also, I double-check that there is 'DHCP start' code.

In 'MX_LWIP_Init()' function, I could find the dhcp_start function.

So,,,.,.,., I think I did all the progress that I can do....

However, I can not connect any DHCP server program, even Window's DHCP mode.

Of course, I use IP Router device.

Is there anybody who using TCP/IP communication with DHCP on freeRTOS??

Or Is there any example??

Or My process is right??

Please help me to get out from this puzzle :(

[Walid ZRELLI · Accepted solution]

Hello @EHa.1​ ,

Unfortunately, we do not have an example DHCP developed in our CubeFW.  But LwIP provides a DHCP test under Middlewares\Third_Party\LwIP\testunit\dhcp that might help you.

BeST Regards,

Walid