ESP-IDF mDash skeleton firmware code

main.c

// Copyright (c) Cesanta Software Limited
// All rights reserved

#include "main.h"

#define REPORT_FREQUENCY_MS 5000

// This function is called by the main superloop every 10ms.
// We trigger shadow update each REPORT_FREQUENCY_MS milliseconds.
// The other way to do it is to start a dedicated FreeRTOS task.
static void tick(int64_t uptime_ms) {
  static int64_t next;
  if (next < uptime_ms) {
    next = uptime_ms - (uptime_ms % REPORT_FREQUENCY_MS) + REPORT_FREQUENCY_MS;
    if (mDashGetState() == MDASH_CONNECTED) {
      // Update shadow with the current values
      mDashShadowUpdate("{\"state\":{\"reported\":{\"ram_free\":%lu}}}",
                        mDashGetFreeRam());
    }
  }
}

void app_main() {
  mDashBegin();

  // If a device recovered after a crash, do not start firmware logic
  // because it could crash again, thus fall into a crash-loop and make
  // a device unusable and un-recoverable.
  // Instead, wait for a possible recovery action.
  // Then reboot (this will change the crash reason) to try the firmware again.
  if (esp_reset_reason() == ESP_RST_PANIC) {
    int seconds = 120;
    MLOG(LL_CRIT, "Restarting after crash. Sleeping for %d min", seconds);
    vTaskDelay(seconds * 1000 / portTICK_PERIOD_MS);  // Sleep
    esp_restart();                                    // And restart again
  }

  // Using superloop instead of RTOS tasks
  for (;;) {
    vTaskDelay(10 / portTICK_PERIOD_MS);         // Sleep 10ms
    mDashCLI(getchar());                         // Handle CLI input
    tick(esp_timer_get_time() / 1000);
  }
}