nes-proj/examples/platform-specific/cc26xx/cc26xx-web-demo/net-uart.c

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/*
* Copyright (c) 2014, 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 cc26xx-web-demo
* @{
*
* \file
* A process which receives data over UART and transmits them over UDP
* to a pre-defined IPv6 address and port. It also listens on the same UDP
* port for messages, which it prints out over UART.
*
* For this example to work, you will have to modify the destination IPv6
* address by adjusting the set_dest_addr() macro below.
*
* To listen on your linux or OS X box:
* nc -6ulkw 1 REMOTE_PORT
*
* (REMOTE_PORT should be the actual value of the define below, e.g. 7777)
*
* Once netcat is up and listening, type something to the CC26xx's terminal
* Bear in mind that the datagram will only be sent after a 0x0a (LF) char
* has been received. Therefore, if you are on Win, do NOT use PuTTY for
* this purpose, since it does not send 0x0a as part of the line end. On
* Win XP use hyperterm. On Win 7 use some other software (e.g. Tera Term,
* which can be configured to send CRLF on enter keystrokes).
*
* To send data in the other direction from your linux or OS X box:
*
* nc -6u \<node IPv6 address\> REMOTE_PORT
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
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#include "sys/process.h"
#include "dev/serial-line.h"
#include "dev/cc26xx-uart.h"
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#include "net/ip/uip.h"
#include "net/ip/uip-udp-packet.h"
#include "net/ip/uiplib.h"
#include "net-uart.h"
#include "httpd-simple.h"
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#include "sys/cc.h"
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#include "ti-lib.h"
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
/*---------------------------------------------------------------------------*/
#define DEBUG DEBUG_NONE
#include "net/ip/uip-debug.h"
/*---------------------------------------------------------------------------*/
#define REMOTE_PORT 7777
#define MAX_MSG_SIZE 100
#define set_dest_addr() uip_ip6addr(&remote_addr, \
0xBBBB, 0x0000, 0x0000, 0x0000, \
0x3E07, 0x54FF, 0xFE74, 0x4885);
/*---------------------------------------------------------------------------*/
#define ADDRESS_CONVERSION_OK 1
#define ADDRESS_CONVERSION_ERROR 0
/*---------------------------------------------------------------------------*/
static struct uip_udp_conn *udp_conn = NULL;
static uint8_t buffer[MAX_MSG_SIZE];
static uint8_t msg_len;
static uip_ip6addr_t remote_addr;
/*---------------------------------------------------------------------------*/
#define IPV6_ADDR_STR_LEN 64
/*---------------------------------------------------------------------------*/
PROCESS(net_uart_process, "Net UART Process");
/*---------------------------------------------------------------------------*/
/*
* \brief Attempts to convert a string representation of an IPv6 address to a
* numeric one.
* \param buf The buffer with the string to be converted.
* \return ADDRESS_CONVERSION_OK or ADDRESS_CONVERSION_ERROR
*
* ToDo: Add support for NAT64 conversion in case the incoming address is a v4
* This is now supported in the current master, so when we pull it in this will
* be very straightforward.
*/
static int
set_new_ip_address(char *buf)
{
/*
* uiplib_ip6addrconv will immediately start writing into the supplied buffer
* even if it subsequently fails. Thus, pass an intermediate buffer
*/
uip_ip6addr_t tmp_addr;
int rv = uiplib_ip6addrconv(buf, &tmp_addr);
if(rv == ADDRESS_CONVERSION_OK) {
/* Conversion OK, copy to our main buffer */
memcpy(&remote_addr, &tmp_addr, sizeof(remote_addr));
PRINTF("Updated remote address ");
PRINT6ADDR(&remote_addr);
PRINTF("\n");
}
return rv;
}
/*---------------------------------------------------------------------------*/
static void
net_input(void)
{
if(uip_newdata()) {
memset(buffer, 0, MAX_MSG_SIZE);
msg_len = MIN(uip_datalen(), MAX_MSG_SIZE - 1);
/* Copy data */
memcpy(buffer, uip_appdata, msg_len);
printf("%s", (char *)buffer);
}
return;
}
/*---------------------------------------------------------------------------*/
static void
release_uart(void)
{
cc26xx_uart_set_input(NULL);
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}
/*---------------------------------------------------------------------------*/
static void
keep_uart_on(void)
{
cc26xx_uart_set_input(serial_line_input_byte);
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}
/*---------------------------------------------------------------------------*/
static int
remote_port_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv;
if(key_len != strlen("net_uart_port") ||
strncasecmp(key, "net_uart_port", strlen("net_uart_port")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
rv = atoi(val);
if(rv <= 65535 && rv > 0) {
cc26xx_web_demo_config.net_uart.remote_port = (uint16_t)rv;
} else {
return HTTPD_SIMPLE_POST_HANDLER_ERROR;
}
return HTTPD_SIMPLE_POST_HANDLER_OK;
}
/*---------------------------------------------------------------------------*/
static int
remote_ipv6_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv = HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
if(key_len != strlen("net_uart_ip") ||
strncasecmp(key, "net_uart_ip", strlen("net_uart_ip")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
if(val_len > IPV6_ADDR_STR_LEN) {
/* Ours but bad value */
rv = HTTPD_SIMPLE_POST_HANDLER_ERROR;
} else {
if(set_new_ip_address(val)) {
memset(cc26xx_web_demo_config.net_uart.remote_address, 0,
NET_UART_IP_ADDR_STRLEN);
memcpy(cc26xx_web_demo_config.net_uart.remote_address, val, val_len);
rv = HTTPD_SIMPLE_POST_HANDLER_OK;
}
}
return rv;
}
/*---------------------------------------------------------------------------*/
static int
on_off_post_handler(char *key, int key_len, char *val, int val_len)
{
int rv;
if(key_len != strlen("net_uart_on") ||
strncasecmp(key, "net_uart_on", strlen("net_uart_on")) != 0) {
/* Not ours */
return HTTPD_SIMPLE_POST_HANDLER_UNKNOWN;
}
rv = atoi(val);
/* Be pedantic: only accept 0 and 1, not just any non-zero value */
if(rv == 0) {
cc26xx_web_demo_config.net_uart.enable = 0;
release_uart();
} else if(rv == 1) {
cc26xx_web_demo_config.net_uart.enable = 1;
keep_uart_on();
} else {
return HTTPD_SIMPLE_POST_HANDLER_ERROR;
}
return HTTPD_SIMPLE_POST_HANDLER_OK;
}
/*---------------------------------------------------------------------------*/
HTTPD_SIMPLE_POST_HANDLER(remote_port, remote_port_post_handler);
HTTPD_SIMPLE_POST_HANDLER(remote_ipv6, remote_ipv6_post_handler);
HTTPD_SIMPLE_POST_HANDLER(on_off, on_off_post_handler);
/*---------------------------------------------------------------------------*/
static void
set_config_defaults(void)
{
/* Set a hard-coded destination address to start with */
set_dest_addr();
/* Set config defaults */
cc26xx_web_demo_ipaddr_sprintf(cc26xx_web_demo_config.net_uart.remote_address,
NET_UART_IP_ADDR_STRLEN, &remote_addr);
cc26xx_web_demo_config.net_uart.remote_port = REMOTE_PORT;
cc26xx_web_demo_config.net_uart.enable = 1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(net_uart_process, ev, data)
{
PROCESS_BEGIN();
printf("CC26XX Net UART Process\n");
set_config_defaults();
udp_conn = udp_new(NULL, UIP_HTONS(0), NULL);
udp_bind(udp_conn, UIP_HTONS(REMOTE_PORT));
if(udp_conn == NULL) {
printf("No UDP connection available, exiting the process!\n");
PROCESS_EXIT();
}
httpd_simple_register_post_handler(&remote_port_handler);
httpd_simple_register_post_handler(&remote_ipv6_handler);
httpd_simple_register_post_handler(&on_off_handler);
while(1) {
PROCESS_YIELD();
if(ev == serial_line_event_message) {
/*
* If the message contains a new IP address, save it and go back to
* waiting.
*/
if(set_new_ip_address((char *)data) == ADDRESS_CONVERSION_ERROR) {
/* Not an IP address in the message. Send to current destination */
memset(buffer, 0, MAX_MSG_SIZE);
/* We need to add a line feed, thus never fill the entire buffer */
msg_len = MIN(strlen(data), MAX_MSG_SIZE - 1);
memcpy(buffer, data, msg_len);
/* Add a line feed */
buffer[msg_len] = 0x0A;
msg_len++;
uip_udp_packet_sendto(
udp_conn, buffer, msg_len, &remote_addr,
UIP_HTONS(cc26xx_web_demo_config.net_uart.remote_port));
}
} else if(ev == tcpip_event) {
net_input();
} else if(ev == cc26xx_web_demo_config_loaded_event) {
/*
* New config. Check if it's possible to update the remote address.
* The port will have been updated already
*/
set_new_ip_address(cc26xx_web_demo_config.net_uart.remote_address);
if(cc26xx_web_demo_config.net_uart.enable == 1) {
keep_uart_on();
}
} else if(ev == cc26xx_web_demo_load_config_defaults) {
set_config_defaults();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
*/