With this app you can control a 4-channel relay with ESP-01 in the network. The app sends control commands to the relay via the network to switch the four channels on or off.
After putting the relay into operation, connect your phone to the relay's WiFi (starts with "ESP_" or "AITHINKER_") and can now control the relay. Alternatively, you can also integrate the relay into your WiFi and then control it via this app. To do this, you first need the Esptouch app to transfer your WiFi access data to the ESP-01.
Access with this app only works in your home WiFi. If you want to control your relay while on the go, you'll need to connect your phone to your network via a VPN. You can find out more about this using a search engine or chat AI of your choice. It's particularly easy with a FritzBox.
You can find more information about the relay at https://www.jf-elektronik.de/app-relay