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client.connected() bug #4728

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@aerlon

Description

@aerlon

Basic Infos

  • This issue complies with the issue POLICY doc.
  • I have read the documentation at readthedocs and the issue is not addressed there.
  • I have tested that the issue is present in current master branch (aka latest git).
  • I have searched the issue tracker for a similar issue.
  • If there is a stack dump, I have decoded it.
  • I have filled out all fields below.

Platform

  • Hardware: ESP-12

  • Core Version:
    SDK:2.2.1(cfd48f3)/Core:win-2.5.0-dev/lwIP:2.0.3(STABLE-2_0_3_RELEASE/glue:arduino-2.4.1-7-g2b827f8)
    SDK:2.2.1(cfd48f3)/Core:win-2.5.0-dev/lwIP:1.4.0rc2
    SDK:2.2.1(cfd48f3)/Core:win-2.4.1/lwIP:2.0.3(STABLE-2_0_3_RELEASE/glue:arduino-2.4.1)
    SDK:2.2.1(cfd48f3)/Core:win-2.4.1/lwIP:1.4.0rc2

  • Development Env: Arduino IDE

  • Operating System: Windows

Settings in IDE

  • Module: NodeMCU 1.0
  • Flash Mode: dio
  • Flash Size: 4MB
  • lwip Variant: v2 Lower Memory OR v1.4
  • Reset Method: nodemcu
  • Flash Frequency: 40Mhz
  • CPU Frequency: 80Mhz
  • Upload Using: SERIAL
  • Upload Speed: 115200

Problem Description

In the latest master branch, the station in the file ClientConnectedBug.ino (download below) seems to randomly loose connection to the AP server while waiting for curr_client.available() to indicate a server response (WiFiClient class is used to create a TCP connection to the server, so curr_client is the server here). This was not the case in Arduino core for ESP8266 version 2.4.1 and 2.3.0. The problem seems to be that !curr_client.connected() at line 50 in ClientConnectedBug.ino now sometimes evaluates to true, whereas before it did not.

Instructions for reproducing bug:

  1. Download and unzip the .ino files in ClientConnectedBug.zip
  2. Make sure you are using Arduino core for ESP8266 version 2.4.1.
  3. Use lwIP2 or lwIP1.4.
  4. Add AP1.ino to one ESP8266 and ClientConnectedBug.ino to another.
  5. Observe serial output from ClientConnectedBug.ino.
  6. Update Arduino core for ESP8266 to latest master branch.
  7. Restart IDE and re-upload ClientConnectedBug.ino.
  8. Observe serial output from ClientConnectedBug.ino.

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