client: Change wire format!: Expand `ago` field: 16 bits → 32 bits

[tattlekey] / client / config.h

/* tattlekey: A one-key UDP keyboard
 * Copyright (C) 2023  Scott Worley <scottworley@scottworley.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef CONFIG_H
#define CONFIG_H

#include "lwip/arch.h"

/* Wi-Fi credentials */
extern const char config_wifi_ssid[];
extern const char config_wifi_pass[];

/* Network address of the server to contact */
extern const char config_tattle_server_ip_address[];
extern const u16_t config_tattle_port;

/* For distinguishing reports from multiple tattlekey devices. */
extern const u16_t config_this_tattler_identity;

/* Which GPIO pin is the button connected to?
 * The button should span this pin and ground, connecting this pin to ground
 * when pressed.
 * https://projects.raspberrypi.org/en/projects/introduction-to-the-pico/10
 * recommends pins 18, 22, or 28. */
extern const uint config_button_pin;

/* Don't bother reporting each separate button press when it is pressed many
 * times in short succession.  (We also use this to de-bounce. :) */
extern const u32_t config_minimum_seconds_between_button_presses;

/* Send each report multiple times. Re-sends are sent with exponential delay:
 *   #1 sent immediately
 *   #2 after 1 seconds
 *   #3 after 2 seconds
 *   #4 after 4 seconds
 *   #5 after 8 seconds
 *   ...
 *   #11 after 8 minutes
 *   #12 after 17 minutes
 *   #13 after 34 minutes
 *   #14 after 68 minutes
 *   #15 after 2 hours
 *   #16 after 4 hours
 *   #17 after 9 hours
 *   etc.
 * This provides some robustness against network outages, automatically
 * replaying the log periodically to be collected after connectivity
 * is restored. */
extern const uint config_resend_count;

/* These control the size of the per-send-count press queues.
When the button is pressed more than config_maximum_queue_size times
within the resend interval, some presses will be reported fewer
than config_resend_count times. This is usually fine because it's
the old, longest-delyed, most-redundant reports that get dropped;
fresh, timely reports of new button presses will not get anywhere near
config_resend_count in a resend interval because the early resend interals
are so short.  */
extern const uint config_maximum_queue_size;

/* This is paranoia about unanticipated delays.  Setting this to zero
would pobably be fine, but imposing a minimum queue size is an easy
safety measure. */
extern const uint config_minimum_queue_size;

#endif