Hi
What have you tried? What Android device are you using?
Meaning of the error code:
Unable to post or put the text %s\ with the specified URL: %s
ProfessorCad: Error Codes Error Message Codes
You might like to try testing the App as an APK instead.
for help connecting to the companion app see here
https://appinventor.mit.edu/explore/ai2/setup
And
https://appinventor.mit.edu/explore/ai2/setup-device-wifi
Taifun
Is this a school or a work environment?
Previously, it could be connected through coding, but now it cannot be connected, and the Iphone scan code cannot be used, and it can only be packaged as APK
Sorry, what platform is your device on, Android or iOS?