Here is the ESPTOUCH android application download address:
https://www.hoinprinter.com/download/40.html
Notice: With 5G and VPN, we can't set the Wifi IP address for the printer
How to set Wifi for 4 inch thermal label printer HOP-HL80B by Mobil phone with ESPTOUCH?
1)Print a barcode
2)Use ESPTOUCH application to scan QR barcode,then you input your local WIFI Password. Then your Wifi IP address will be printed automatically
3)Go to computer,find label printer driver. Add this set IP in our label printer driver port.
4)Then you can print a test page or a PDF through this driver, that mean WIFI set success.