What is the minimum debug level (TOOLS tab) which will display the stack trace on crash?

I would like to reduce information clutter in the serial monitor.

I understand that debug port must point to my serial monitor.

In case it makes a difference, it is a NodeMCU, running C++, in Arduino IDE on a Ubuntu 16.04 machine.

1 Answer 1


The crash report is printed to 'standard output' by __wrap_system_restart_local in core_esp8266_postmortem.c in esp8266 Arduino core.

The standard output is considered as debug output in esp8266 Arduino core. Debug output to hardware Serial can be enabled in runtime by Serial.setDebugOutput(true);.

At compile time the initial debug output is controled by -DDEBUG_ESP_PORT=, for example -DDEBUG_ESP_PORT=Serial1. The Tools menu "Debug port" sets the DEBUG_ESP_PORT define. The crash report is not controlled by "Debug level" setting.

  • Tks. Compiles. Testing. Is it your evaluation that a question regarding the purposes and effects of Debug Level would be appropriate?
    – tony gil
    Jun 11, 2019 at 22:19
  • 1
    take a look into the boards.txt file in the esp8266 boards package installation folder
    – Juraj
    Jun 12, 2019 at 5:24

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