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/*
* Usurpation – wearable device main logic
*
* Copyright (C) 2019 Gediminas Jakutis
* Copyright (C) 2019 Ramūnas Mažeikis
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <Wire.h>
#include <stdlib.h>
#include <stddef.h>
#include "SSD1306Wire.h"
#include "DejaVu_Sans_Mono_13.h"
static char udppacketbuffer[32] = {0};
static char *udppacketcursor = NULL;
static const unsigned int internal_led = 2;
static unsigned int led_state = 0;
static const char servermagic[] = "I love coffee!";
static const char clientmagic[] = "I love tea!";
static const int com_port = 6996;
IPAddress ip; /* Daemon IP */
WiFiUDP Udp;
SSD1306Wire display(0x3c, 4, 5, GEOMETRY_128_32);
static void init_OLED(void);
unsigned int toggle_led(const int ip);
static int wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin);
static void discover_client(const int port);
static void udp_init_packet(IPAddress ip, const int port);
static void udp_push(const void * const data, const size_t size);
static int udp_flush(void);
static void blink_led(const int pin, const int ontime, const int offtime);
void setup(void)
{
extern const char * const ssid;
extern const char * const password;
pinMode(internal_led, OUTPUT);
toggle_led(internal_led);
init_OLED();
display.fillCircle(32, 16, 12);
display.display();
wifi_connect(ssid, password, 1, internal_led);
Udp.begin(com_port);
display.fillCircle(64, 16, 12);
display.display();
discover_client(com_port);
display.fillCircle(92, 16, 12);
display.display();
}
/* the logic is a placeholder right now */
void loop(void)
{
static const String devstr = "Device IP:";
static const String daemonstr = "Daemon IP:";
static String prefix;
static IPAddress ip_to_print;
static int print_dev_ip = 0;
static unsigned int delta = 2000; /* sleep length to use (ms) */
/* static int dot_idx = 0; */
delay(delta);
udp_init_packet(ip, com_port);
udp_push(clientmagic, sizeof(clientmagic));
udp_flush();
#if 0
if (dot_idx >= 2) {
display.clear();
dot_idx = 0;
}
display.fillCircle(32 * (dot_idx + 1), 16, 12);
dot_idx++;
#endif
prefix = (print_dev_ip) ? devstr : daemonstr;
ip_to_print = (print_dev_ip) ? WiFi.localIP() : ip;
display.clear();
display.drawString(0, 0, prefix);
display.drawString(0, 16, ip_to_print.toString());
display.display();
print_dev_ip = !print_dev_ip;
}
static void init_OLED(void)
{
display.init();
display.flipScreenVertically();
display.setTextAlignment(TEXT_ALIGN_LEFT);
display.setFont((uint8_t *)DejaVu_Sans_Mono_13);
}
/* toggle the bult-in led and return current state */
unsigned int toggle_led(const int pin)
{
led_state = !led_state;
/* as the cathode of the builtin diode is connected to the MCU's pin,
* while the anode is connected to Vcc, to turn it off, we need to set
* the pin to HIGH.
*/
digitalWrite(pin, led_state ? LOW : HIGH);
return led_state;
}
static int wifi_connect(const char * const ssid, const char * const password, const char doblink, const int ledpin)
{
size_t i = 30;
WiFi.forceSleepWake();
yield();
WiFi.persistent(0);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
do {
if (doblink) {
blink_led(ledpin, 250, 250);
} else {
delay (500);
}
} while (WiFi.status() != WL_CONNECTED);
return 0;
}
static void discover_client(const int port)
{
IPAddress bcastip(255, 255, 255, 255);
char buffer[32] = {0};
size_t done = 0;
do {
udp_init_packet(bcastip, port);
udp_push(servermagic, sizeof(servermagic));
udp_flush();
delay(5);
while (Udp.parsePacket()) {
if (Udp.available() >= sizeof(clientmagic)) {
Udp.read(buffer, sizeof(clientmagic));
if (!(strcmp(clientmagic, buffer))) {
ip = Udp.remoteIP();
++done;
}
}
}
delay(95);
} while (!done);
}
static void udp_init_packet(IPAddress ip, const int port)
{
Udp.beginPacket(ip, port);
memset(udppacketbuffer, 0, sizeof(udppacketbuffer));
udppacketcursor = udppacketbuffer;
}
static void udp_push(const void * const data, const size_t size)
{
memcpy(udppacketcursor, data, size);
udppacketcursor += size;
}
static int udp_flush(void)
{
Udp.write((const uint8_t *) udppacketbuffer, udppacketcursor - udppacketbuffer);
return Udp.endPacket();
}
static void blink_led(const int pin, const int ontime, const int offtime)
{
toggle_led(pin);
delay(ontime);
toggle_led(pin);
delay(offtime);
}
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