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/*
* An unnamed project – client 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>
static void init(const unsigned int port, int *sock);
static int getpacket(char *data, size_t buffsize, int *sock, struct sockaddr_in *sender);
static void draw_idle(void);
static void draw_busy(const char * const data);
static float digest_mpu_temp(const short int rawdata);
static float digest_thermistor_voltage(const short int rawdata);
int main(void)
{
static const char servermagic[] = "I love coffee!";
static const char clientmagic[] = "I love tea!";
struct sockaddr_in srvaddr = {0};
char buff[9001] = {0};
int sock;
int pstatus;
struct timespec lastreply;
struct timespec now;
init(2191, &sock);
clock_gettime(CLOCK_MONOTONIC_RAW, &now);
lastreply = now;
lastreply.tv_sec -= 5;
do {
clock_gettime(CLOCK_MONOTONIC_RAW, &now);
pstatus = getpacket(buff, sizeof(buff), &sock, &srvaddr);
switch (pstatus) {
case 0:
if ((now.tv_sec - lastreply.tv_sec) >= 5) {
draw_idle();
}
break;
case 1:
lastreply = now;
if (buff[0] == 'I') {
if (!(strcmp(buff, servermagic))) {
sendto(sock, clientmagic, sizeof(clientmagic),
MSG_DONTWAIT, (struct sockaddr *) &srvaddr, sizeof(srvaddr));
}
draw_idle();
continue;
}
draw_busy(buff);
break;
default:
; /* noop */
}
} while (getch() != 'q' && pstatus >= 0);
close(sock);
endwin();
return 0;
}
static void init(const unsigned int port, int *sock)
{
struct sockaddr_in bindaddress = {0};
bindaddress.sin_family = AF_INET;
bindaddress.sin_port = htons(port);
*sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
bind(*sock, (struct sockaddr*) &bindaddress, sizeof(bindaddress));
initscr();
nodelay(stdscr, 1);
noecho();
}
static int getpacket(char *data, size_t buffsize, int *sock, struct sockaddr_in *sender)
{
static struct pollfd pfd = {0};
int ret;
socklen_t sender_len = sizeof(*sender);
if (!pfd.fd) {
pfd.fd = *sock;
pfd.events = POLLIN;
pfd.revents = 0;
}
ret = poll(&pfd, 1, 25);
if (ret <= 0) {
return ret;
}
if (pfd.revents & POLLIN) {
recvfrom(*sock, data, buffsize, MSG_DONTWAIT, (struct sockaddr *) sender, &sender_len);
ret = 1;
} else {
ret = 0;
}
return ret;
}
static void draw_idle(void)
{
move(0, 0);
clrtoeol();
printw("sequence: [waiting for ESP8266...]");
move(1, 0);
clrtoeol();
mvprintw(1, 0, "mpu temp: [waiting for ESP8266...]");
move(2, 0);
clrtoeol();
mvprintw(2, 0, "thermistor voltage: [waiting for ESP8266...]");
move(3, 0);
clrtoeol();
mvprintw(3, 0, "press 'q' to exit");
refresh();
}
static void draw_busy(const char * const data)
{
unsigned int sequence;
short int mpu_data;
short int thermistor_data;
float mpu_temp;
float thermistor_voltage;
memcpy(&sequence, data + 2, sizeof(sequence));
memcpy(&mpu_data, data + 6, sizeof(mpu_data));
memcpy(&thermistor_data, data + 8, sizeof(thermistor_data));
mpu_temp = digest_mpu_temp(mpu_data);
thermistor_voltage = digest_thermistor_voltage(thermistor_data);
move(0, 0);
clrtoeol();
printw("sequence: %u", sequence);
move(1, 0);
clrtoeol();
mvprintw(1, 0, "mpu temp: %.3fC", mpu_temp);
move(2, 0);
clrtoeol();
mvprintw(2, 0, "thermistor voltage: %.3fV", thermistor_voltage);
move(3, 0);
clrtoeol();
mvprintw(3, 0, "press 'q' to exit");
refresh();
}
static float digest_mpu_temp(const short int rawdata)
{
float ret;
ret = rawdata / 340.0f + 36.53f;
return ret;
}
static float digest_thermistor_voltage(const short int rawdata)
{
float ret;
ret = rawdata * 0.003222656f;
return ret;
}
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