322 lines
11 KiB
C
322 lines
11 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc13xx-cc26xx-web-demo
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* @{
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*
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* \file
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* A process which receives data over UART and transmits them over UDP
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* to a pre-defined IPv6 address and port. It also listens on the same UDP
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* port for messages, which it prints out over UART.
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*
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* For this example to work, you will have to modify the destination IPv6
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* address by adjusting the set_dest_addr() macro below.
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*
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* To listen on your linux or OS X box:
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* nc -6ulkw 1 REMOTE_PORT
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*
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* (REMOTE_PORT should be the actual value of the define below, e.g. 7777)
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*
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* Once netcat is up and listening, type something to the CC13xx/CC26xx's terminal
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* Bear in mind that the datagram will only be sent after a 0x0a (LF) char
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* has been received. Therefore, if you are on Win, do NOT use PuTTY for
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* this purpose, since it does not send 0x0a as part of the line end. On
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* Win XP use hyperterm. On Win 7 use some other software (e.g. Tera Term,
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* which can be configured to send CRLF on enter keystrokes).
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*
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* To send data in the other direction from your linux or OS X box:
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*
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* nc -6u \<node IPv6 address\> REMOTE_PORT
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "sys/cc.h"
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#include "sys/process.h"
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#include "dev/serial-line.h"
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#include "net/ipv6/uip.h"
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#include "net/ipv6/uip-udp-packet.h"
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#include "net/ipv6/uiplib.h"
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/*---------------------------------------------------------------------------*/
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#include "uart0-arch.h"
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/*---------------------------------------------------------------------------*/
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#include "net-uart.h"
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#include "httpd-simple.h"
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/*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <string.h>
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#include <strings.h>
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#include <stdio.h>
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#include <stdlib.h>
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/*---------------------------------------------------------------------------*/
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#define DEBUG DEBUG_NONE
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#include "net/ipv6/uip-debug.h"
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/*---------------------------------------------------------------------------*/
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#define REMOTE_PORT 7777
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#define MAX_MSG_SIZE 100
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#define set_dest_addr() uip_ip6addr(&remote_addr, \
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0xBBBB, 0x0000, 0x0000, 0x0000, \
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0x3E07, 0x54FF, 0xFE74, 0x4885);
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/*---------------------------------------------------------------------------*/
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#define ADDRESS_CONVERSION_OK 1
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#define ADDRESS_CONVERSION_ERROR 0
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/*---------------------------------------------------------------------------*/
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static struct uip_udp_conn *udp_conn = NULL;
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static uint8_t buffer[MAX_MSG_SIZE];
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static uint8_t msg_len;
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static uip_ip6addr_t remote_addr;
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/*---------------------------------------------------------------------------*/
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#define IPV6_ADDR_STR_LEN 64
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/*---------------------------------------------------------------------------*/
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PROCESS(net_uart_process, "Net UART Process");
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/*---------------------------------------------------------------------------*/
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/*
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* \brief Attempts to convert a string representation of an IPv6 address to a
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* numeric one.
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* \param buf The buffer with the string to be converted.
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* \return ADDRESS_CONVERSION_OK or ADDRESS_CONVERSION_ERROR
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*
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* ToDo: Add support for NAT64 conversion in case the incoming address is a v4
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* This is now supported in the current master, so when we pull it in this will
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* be very straightforward.
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*/
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static int
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set_new_ip_address(char *buf)
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{
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/*
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* uiplib_ip6addrconv will immediately start writing into the supplied buffer
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* even if it subsequently fails. Thus, pass an intermediate buffer
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*/
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uip_ip6addr_t tmp_addr;
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int rv = uiplib_ip6addrconv(buf, &tmp_addr);
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if(rv == ADDRESS_CONVERSION_OK) {
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/* Conversion OK, copy to our main buffer */
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memcpy(&remote_addr, &tmp_addr, sizeof(remote_addr));
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PRINTF("Updated remote address ");
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PRINT6ADDR(&remote_addr);
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PRINTF("\n");
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}
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return rv;
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}
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/*---------------------------------------------------------------------------*/
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static void
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net_input(void)
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{
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if(uip_newdata()) {
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memset(buffer, 0, MAX_MSG_SIZE);
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msg_len = MIN(uip_datalen(), MAX_MSG_SIZE - 1);
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/* Copy data */
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memcpy(buffer, uip_appdata, msg_len);
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printf("%s", (char *)buffer);
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}
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return;
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}
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/*---------------------------------------------------------------------------*/
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static void
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release_uart(void)
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{
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uart0_set_callback(NULL);
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}
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/*---------------------------------------------------------------------------*/
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static void
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keep_uart_on(void)
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{
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uart0_set_callback(serial_line_input_byte);
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}
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/*---------------------------------------------------------------------------*/
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static int
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remote_port_post_handler(char *key, int key_len, char *val, int val_len)
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{
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int rv;
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if(key_len != strlen("net_uart_port") ||
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strncasecmp(key, "net_uart_port", strlen("net_uart_port")) != 0) {
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/* Not ours */
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return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
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}
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rv = atoi(val);
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if(rv <= 65535 && rv > 0) {
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web_demo_config.net_uart.remote_port = (uint16_t)rv;
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} else {
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return HTTPD_SIMPLE_POST_HANDLER_ERROR;
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}
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return HTTPD_SIMPLE_POST_HANDLER_OK;
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}
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/*---------------------------------------------------------------------------*/
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static int
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remote_ipv6_post_handler(char *key, int key_len, char *val, int val_len)
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{
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int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
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if(key_len != strlen("net_uart_ip") ||
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strncasecmp(key, "net_uart_ip", strlen("net_uart_ip")) != 0) {
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/* Not ours */
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return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
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}
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if(val_len > IPV6_ADDR_STR_LEN) {
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/* Ours but bad value */
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rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
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} else {
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if(set_new_ip_address(val)) {
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memset(web_demo_config.net_uart.remote_address, 0,
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NET_UART_IP_ADDR_STRLEN);
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memcpy(web_demo_config.net_uart.remote_address, val, val_len);
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rv = HTTPD_SIMPLE_POST_HANDLER_OK;
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}
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}
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return rv;
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}
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/*---------------------------------------------------------------------------*/
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static int
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on_off_post_handler(char *key, int key_len, char *val, int val_len)
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{
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int rv;
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if(key_len != strlen("net_uart_on") ||
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strncasecmp(key, "net_uart_on", strlen("net_uart_on")) != 0) {
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/* Not ours */
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return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
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}
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rv = atoi(val);
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/* Be pedantic: only accept 0 and 1, not just any non-zero value */
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if(rv == 0) {
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web_demo_config.net_uart.enable = 0;
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release_uart();
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} else if(rv == 1) {
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web_demo_config.net_uart.enable = 1;
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keep_uart_on();
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} else {
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return HTTPD_SIMPLE_POST_HANDLER_ERROR;
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}
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return HTTPD_SIMPLE_POST_HANDLER_OK;
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}
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/*---------------------------------------------------------------------------*/
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HTTPD_SIMPLE_POST_HANDLER(remote_port, remote_port_post_handler);
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HTTPD_SIMPLE_POST_HANDLER(remote_ipv6, remote_ipv6_post_handler);
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HTTPD_SIMPLE_POST_HANDLER(on_off, on_off_post_handler);
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/*---------------------------------------------------------------------------*/
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static void
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set_config_defaults(void)
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{
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/* Set a hard-coded destination address to start with */
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set_dest_addr();
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/* Set config defaults */
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web_demo_ipaddr_sprintf(web_demo_config.net_uart.remote_address,
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NET_UART_IP_ADDR_STRLEN, &remote_addr);
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web_demo_config.net_uart.remote_port = REMOTE_PORT;
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web_demo_config.net_uart.enable = 1;
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(net_uart_process, ev, data)
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{
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PROCESS_BEGIN();
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printf("CC13xx/CC26xx Net UART Process\n");
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set_config_defaults();
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udp_conn = udp_new(NULL, UIP_HTONS(0), NULL);
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udp_bind(udp_conn, UIP_HTONS(REMOTE_PORT));
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if(udp_conn == NULL) {
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printf("No UDP connection available, exiting the process!\n");
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PROCESS_EXIT();
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}
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httpd_simple_register_post_handler(&remote_port_handler);
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httpd_simple_register_post_handler(&remote_ipv6_handler);
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httpd_simple_register_post_handler(&on_off_handler);
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while(1) {
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PROCESS_YIELD();
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if(ev == serial_line_event_message) {
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/*
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* If the message contains a new IP address, save it and go back to
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* waiting.
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*/
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if(set_new_ip_address((char *)data) == ADDRESS_CONVERSION_ERROR) {
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/* Not an IP address in the message. Send to current destination */
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memset(buffer, 0, MAX_MSG_SIZE);
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/* We need to add a line feed, thus never fill the entire buffer */
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msg_len = MIN(strlen(data), MAX_MSG_SIZE - 1);
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memcpy(buffer, data, msg_len);
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/* Add a line feed */
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buffer[msg_len] = 0x0A;
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msg_len++;
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uip_udp_packet_sendto(
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udp_conn, buffer, msg_len, &remote_addr,
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UIP_HTONS(web_demo_config.net_uart.remote_port));
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}
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} else if(ev == tcpip_event) {
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net_input();
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} else if(ev == web_demo_config_loaded_event) {
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/*
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* New config. Check if it's possible to update the remote address.
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* The port will have been updated already
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*/
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set_new_ip_address(web_demo_config.net_uart.remote_address);
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if(web_demo_config.net_uart.enable == 1) {
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keep_uart_on();
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}
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} else if(ev == web_demo_load_config_defaults) {
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set_config_defaults();
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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