client: Don't sleep in interrupt context

[tattlekey] / client / tattlekey.c

#include "pico/cyw43_arch.h"
#include "pico/stdlib.h"
#include "pico/util/queue.h"

#include "blink.h"
#include "button.h"
#include "config.h"
#include "net.h"

queue_t queue;

static void button_pressed() {
  /* This runs in interrupt context; don't linger.  */
  char zero = '\0';
  /* We don't check for failure (full queue) here because there's not much to be
   * done about it. */
  queue_try_add(&queue, &zero);
}

int main() {
  stdio_init_all();
  if (cyw43_arch_init_with_country(CYW43_COUNTRY_USA))
    signal_error_by_blinking();
  signal(1, 200);
  cyw43_arch_enable_sta_mode();
  signal(2, 200);
  if (cyw43_arch_wifi_connect_timeout_ms(wifi_ssid, wifi_pass,
                                         CYW43_AUTH_WPA2_AES_PSK, 10000))
    signal_error_by_blinking();
  signal(3, 200);

  queue_init(&queue, 1, 99);

  begin_listening_for_button_press(button_pressed);

  u16_t seq = 0;
  while (1) {
    char _;
    queue_remove_blocking(&queue, &_);
    send_report(seq++, 0);
    signal(4, 200);
  }
}