Last Updated or created 2025-05-07

Where is it, what device could it be?

Its SSID started with ESP. So I probably am the one responsible for its existence.
I’ve got a sh*tload of ESPs/NodeMCUs/8266 turned on 24-7.

Using a Wifi analizer I could narrow it down to my livingroom.
Checked all devices, and they are all connected to my AccessPoint.
(So no fallback AP mode)

The problem with this method is that you can’t figure out a direction.

So I used this on my Laptop.

This is a directional antenna.

Using Wireshark and wavemon, I could find the direction.

There were only two devices in the direction with the strongest signal.
My photo viewer remote, and my mini turntable controller with RFID.

But these devices are working just fine! .. So lets disconnect the power.
So it IS the mini recordplayer!

Lets look at the code. (part of)

WiFi.mode(WIFI_AP_STA); 

I should have used

WiFi.mode(WIFI_STA); 

Now it was a client AND an Access Point!

Mystery solved!