In MicroPython v1.24.1 names with .local resolve on ESP32C3 but not on ESP8266 #16817

juhanijaakola · 2025-02-25T17:27:48Z

juhanijaakola
Feb 25, 2025

Local addresses with .local suffix work on ESP32C3 but not on ESP8266. If I remove the .local suffix, it works. DNS works.

However, on ESP32C3 addresses without the suffix resolve immediately, but with the .local suffix resolution takes 3..5 seconds.

I want to use urequests.post() and it gives me OSError: -2. With usocket.getaddrinfo() the problem is easier to demonstrate:

On ESP32C3 (TENSTAR ROBOT Super Mini):

MicroPython` v1.24.1 on 2024-11-29; ESP32C3 module with ESP32C3
Type "help()" for more information.
 >>>
>>> import usocket
>>> usocket.getaddrinfo('www.google.com', 80, 0, usocket.SOCK_STREAM)
[(2, 1, 0, 'www.google.com', ('216.58.210.132', 80))]
>>> usocket.getaddrinfo('hp.local', 80, 0, usocket.SOCK_STREAM)
[(2, 1, 0, 'hp.local', ('192.168.32.183', 80))]
>>> usocket.getaddrinfo('hp', 80, 0, usocket.SOCK_STREAM)
[(2, 1, 0, 'hp', ('192.168.32.183', 80))]

On ESP8266 (wemos.cc LoLin NodeMCU V3):

MicroPython v1.24.1 on 2024-11-29; ESP module with ESP8266
Type "help()" for more information.
>>>
>>> import usocket
>>> usocket.getaddrinfo('www.google.com', 80, 0, usocket.SOCK_STREAM)
[(2, 1, 0, '', ('216.58.209.164', 80))]
>>> usocket.getaddrinfo('hp.local', 80, 0, usocket.SOCK_STREAM)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: -2
>>> usocket.getaddrinfo('hp', 80, 0, usocket.SOCK_STREAM)
[(2, 1, 0, '', ('192.168.32.183', 80))]

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In MicroPython v1.24.1 names with .local resolve on ESP32C3 but not on ESP8266 #16817

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MicroPython

In MicroPython v1.24.1 names with .local resolve on ESP32C3 but not on ESP8266 #16817

Uh oh!

juhanijaakola Feb 25, 2025

Replies: 0 comments

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juhanijaakola
Feb 25, 2025