Log onto AP and changing connected STA and KEEP the AP alive

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Log onto AP and changing connected STA and KEEP the AP alive

By RichardS
- Sun Dec 16, 2018 11:44 pm #79599 I want to log onto the ESP8266 as an AP, and send it commands to change the attached STA, however when I do this it drops the AP I am connected to....

Edit: This is really being attempted on an ESP32, however I know the 2 are very similar... If anyone tries the example code on a ESP8266 please report. The code is posted a few posts down in this thread.

How??

RichardS
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Re: Log onto AP and changing connected STA and KEEP the AP a

By martinayotte
- Tue Dec 18, 2018 10:18 am #79614
RichardS wrote:I want to log onto the ESP8266 as an AP, and send it commands to change the attached STA, however when I do this it drops the AP I am connected to....

How??

RichardS


This is usually caused by the fact that your AP is on one channel, and STA on different channel.
If your router always use fixed channel, start your AP with the same forced channel assigment, then, when STA connect, it should not disconnect you from AP.
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Re: Log onto AP and changing connected STA and KEEP the AP a

By RichardS
- Tue Dec 18, 2018 2:38 pm #79618 Interesting, never tried that, will do that now and let you know!

Thanks!

RichardS
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Re: Log onto AP and changing connected STA and KEEP the AP a

By RichardS
- Tue Dec 18, 2018 3:22 pm #79620 I wrote an example to prove the issue.

1. Start CMD on windows machine and issue ping 192.168.4.1 -t

2. Change "your-ssid" and "your-password" to reflect your network.... then Run the sketch

3. find "myhost" in your wireless AP settings on the PC and log in.... (do it quickly you have 20 seconds)

4. you will see ping working

5. in 20 seconds the code will attempt to log onto an AP that does not exist....

6. the ping will start failing.....

WHY?

RichardS

Code: Select all#include <WiFi.h>

void setup() {
  Serial.begin(500000);
}

char *hostName = "myhost";
char *hostPassword = "";
char *ssid = "your-ssid";
char *password = "your-password";
static char *oldssid = ssid;
int connected = 0;

void refresh(bool firstTime) {
  static bool Connected = false;
  static bool tryAgain = false;
  static int cnt = 0;

  connected = WiFi.status() ==  WL_CONNECTED || WiFi.isConnected();

  // runs this only once
  if (firstTime) {
    WiFi.mode(WIFI_AP_STA);
    WiFi.softAP(hostName, hostPassword, 10);
    Serial.printf("setting %s with %s\n", hostName, hostPassword);
    connected = false;
    tryAgain = true;
  }

  // if the ssid changed then reconnect
  if (ssid != oldssid) {
    oldssid = ssid;
    tryAgain = true;
  }

  // this runs when we change something
  if (tryAgain) {
    tryAgain = false;
    connected = false;
    cnt = 0;
    if (ssid != "" && password == "") {
      Serial.printf("Connecting to %s without password\n", ssid);
      WiFi.disconnect();
      WiFi.begin(ssid);
    }
    else if (ssid != "" && password != "") {
      Serial.printf("Connecting to %s with password\n", ssid);
      WiFi.disconnect();
      WiFi.begin(ssid, password);
    }
    else {
      Serial.printf("WIFI", "huh??\n");
      WiFi.disconnect();
      WiFi.begin();
    }
  }
}

void loop() {
  refresh(true); // runs once
  for (;;) {
    if (millis() / 1000 == 20) { // change the ssid in 20 seconds
      ssid = "tmp";
    }
    if (millis() % 500 == 0) { // show progress
      Serial.printf("%u connected = %u\n", millis() / 1000, connected);
      delay(10);
    }
    refresh(false);
  }
}

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