/* * Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/ * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */ /** \addtogroup cc2538-examples * @{ * * \defgroup cc2538-echo-server cc2538dk UDP Echo Server Project * * Tests that a node can correctly join an RPL network and also tests UDP * functionality * @{ * * \file * An example of a simple UDP echo server for the cc2538dk platform */ #include "contiki.h" #include "contiki-lib.h" #include "contiki-net.h" #include #define DEBUG DEBUG_PRINT #include "net/ip/uip-debug.h" #include "dev/watchdog.h" #include "dev/leds.h" #include "net/rpl/rpl.h" /*---------------------------------------------------------------------------*/ #define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN]) #define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[uip_l2_l3_hdr_len]) #define MAX_PAYLOAD_LEN 120 /*---------------------------------------------------------------------------*/ static struct uip_udp_conn *server_conn; static char buf[MAX_PAYLOAD_LEN]; static uint16_t len; /*---------------------------------------------------------------------------*/ PROCESS(udp_echo_server_process, "UDP echo server process"); AUTOSTART_PROCESSES(&udp_echo_server_process); /*---------------------------------------------------------------------------*/ static void tcpip_handler(void) { memset(buf, 0, MAX_PAYLOAD_LEN); if(uip_newdata()) { leds_on(LEDS_RED); len = uip_datalen(); memcpy(buf, uip_appdata, len); PRINTF("%u bytes from [", len); PRINT6ADDR(&UIP_IP_BUF->srcipaddr); PRINTF("]:%u\n", UIP_HTONS(UIP_UDP_BUF->srcport)); uip_ipaddr_copy(&server_conn->ripaddr, &UIP_IP_BUF->srcipaddr); server_conn->rport = UIP_UDP_BUF->srcport; uip_udp_packet_send(server_conn, buf, len); uip_create_unspecified(&server_conn->ripaddr); server_conn->rport = 0; } leds_off(LEDS_RED); return; } /*---------------------------------------------------------------------------*/ PROCESS_THREAD(udp_echo_server_process, ev, data) { PROCESS_BEGIN(); PRINTF("Starting UDP echo server\n"); server_conn = udp_new(NULL, UIP_HTONS(0), NULL); udp_bind(server_conn, UIP_HTONS(3000)); PRINTF("Listen port: 3000, TTL=%u\n", server_conn->ttl); while(1) { PROCESS_YIELD(); if(ev == tcpip_event) { tcpip_handler(); } } PROCESS_END(); } /*---------------------------------------------------------------------------*/ /** * @} * @} */