deep_sleep not working in all situations (GIT8266O-389)

[tinu11]

Environment

• Development Kit:

• IDF version (git rev-parse --short HEAD to get the commit id.): 456efce

• Development Env: [VSC]

• Operating System: [|Ubuntu|]

• Power Supply: [|external 5V|]

Problem Description

esp_deep_sleep(SLEEP_DURATION_uSECS); in app_main has no effect.

Expected Behavior

the instruction after esp_deep_sleep() should not be executet but the system should rather go into deep sleep and restart after the sleep period.

Actual Behavior

The esp_deep_sleep() call has no effect. Following instructions are executed - no restart.

Also when I start a MQTT app in app_main and when the mqtt event handler calls esp_deep_sleep() after successful publishing a message, then it works as expected,

Steps to repropduce

1. just run below mentioned app_main
2. ...

Code to reproduce this issue

#include "esp_log.h"

void app_main(){
ESP_LOGI(TAG, "[APP] Startup..");
ESP_LOGI(TAG, "[APP] Free memory: %d bytes", esp_get_free_heap_size());
ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());

esp_log_level_set("*", ESP_LOG_VERBOSE);

ESP_LOGI(TAG, "going into deep sleep for 20 sec");
esp_deep_sleep(20000000);
ESP_LOGE(TAG, "It did not work");

}

Debug Logs

Other items if possible