Webserver hangs up while device is still reachable by ping without problems

[calkoe]

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: [esp8266EX]
• Core Version: (Update platform.txt #5724)
• Development Env: [Arduino IDE]
• Operating System: [MacOS]

Settings in IDE

• Module: [Nodemcu]
• Flash Mode: [qio]
• Flash Size: [4MB]
• lwip Variant: [v2 Higher Bandwidth]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [160MHz]
• Upload Using: [SERIAL]
• Upload Speed: [115200]

Problem Description

• After a while (20 - 60sec) the Webserver stops answering to requests while the device is still reachable by ping.
• After about 30sec the Webserver continues working without any problems.
• there are not WiFi-Scans or STA the ESP tryes to connect, see simple script below.

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
ESP8266WebServer server(80);

void handleRPC() {
  server.send(200, "application/json", "{\"id\": 2858,\"method\": \"system.getStatus\",\"payload\": {\"system\": {\"batteryPowerSupply\": true,\"batteryPercent\": 100,\"totalBytes\": 2949250,\"usedBytes\": 1004,\"freeHeap\": 35552,\"currentTaskTime\": 129867,\"status\": 5},\"wifi\": {\"ssid\": \"Wolke\",\"status\": 3,\"mode\": 3,\"ip\": \"192.168.135.163\",\"rssi\": -47},\"application\": {\"name\": \"radar\",\"version\": \"0.1\",\"statusEnable\": false,\"statusStatus\": false,\"statusText\": \"\"}},\"success\": true,\"status\": \"ok\"}");
}

void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print("Configuring access point...");
  WiFi.softAPConfig(IPAddress(192, 168, 5, 1), IPAddress(192, 168, 5, 1), IPAddress(255, 255, 255, 0));
  WiFi.softAP("arduinoOS");

  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/rpc", handleRPC);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  server.handleClient();yield();
}

[devyte]

Please test with the following before calling softAPConfig():

WiFi.persistent(false);
WiFi.mode(WiFI_AP);

and also make sure to do a full flash wipe before flashing this sketch.

[devyte]

No feedback in several months. Closing.