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/*
* Hot Beverage Companion – server module
*
* Copyright (C) 2017 Gediminas Jakutis
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <poll.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <ncurses.h>
#include <stddef.h>
#include <stdlib.h>
#include <time.h>
#include "net.h"
static struct netstate *init(const unsigned int port);
static void draw_idle(void);
static void draw_busy(const char * const data);
static float digest_temp(const short int rawdata);
int main(void)
{
struct netstate *state;
char data[32] = {0};
int status;
struct timespec wait = {0, 100 * 1000 * 1000};
state = init(2191);
do {
status = state->getlastdata(data, state);
switch (status) {
case NET_OK:
/*fall-through */
case NET_NONEWDATA:
draw_busy(data);
break;
case NET_ERROR:
goto fail;
default:
draw_idle();
; /* noop */
}
nanosleep(&wait, NULL);
} while (getch() != 'q');
fail:
net_close(&state);
endwin();
return 0;
}
static struct netstate *init(const unsigned int port)
{
struct netstate *ret;
ret = net_init(port);
initscr();
nodelay(stdscr, 1);
noecho();
return ret;
}
static void draw_idle(void)
{
move(0, 0);
clrtoeol();
printw("sequence: [waiting for ESP8266...]");
move(1, 0);
clrtoeol();
mvprintw(1, 0, "thermistor temp: [waiting for ESP8266...]");
move(2, 0);
clrtoeol();
mvprintw(2, 0, "thermistor resistance: [waiting for ESP8266...]");
move(3, 0);
clrtoeol();
mvprintw(3, 0, "tap voltage: [waiting for ESP8266...]");
move(4, 0);
clrtoeol();
mvprintw(4, 0, "press 'q' to exit");
refresh();
}
static void draw_busy(const char * const data)
{
unsigned int sequence;
short int thermistor_data;
short int voltage;
float temp;
memcpy(&sequence, data + 2, sizeof(sequence));
memcpy(&thermistor_data, data + 6, sizeof(thermistor_data));
temp = digest_temp(thermistor_data);
memcpy(&thermistor_data, data + 10, sizeof(thermistor_data));
memcpy(&voltage, data + 12, sizeof(voltage));
move(0, 0);
clrtoeol();
printw("sequence: %u", sequence);
move(1, 0);
clrtoeol();
mvprintw(1, 0, "thermistor temp: %.1fC", temp);
move(2, 0);
clrtoeol();
mvprintw(2, 0, "thermistor resistance: %hd", thermistor_data);
move(3, 0);
clrtoeol();
mvprintw(3, 0, "tap voltage: %hd", voltage);
move(4, 0);
clrtoeol();
mvprintw(4, 0, "press 'q' to exit");
refresh();
}
/*
* raw data is in 0.1°K per 1. Subtract 2730 to get Celsius.
* Multiply by 0.1f (divide by 10) to get the correct scale.
*/
static float digest_temp(const short int rawdata)
{
float ret;
ret = (rawdata - 2730) * 0.1f;
return ret;
}
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