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  • The library could possibly store the addresses of the C strings and use them later, but your arguments do not live long enough. Please check what happens if you copy the C strings into some other variables. -- Or use C string variables as experiment before (in this comment just shorted: char url[] = "192.168.1.45"; /* ... */ mqtt.begin(url, ...);) Commented Sep 21, 2024 at 17:47
  • @thebusybee Interesting, it does seems to be memory related. I'll update the question with the modifications. Commented Sep 21, 2024 at 18:39
  • It does look like the begin() method expects the user to provide static storage for the char* arguments as said by @the busybee. The class retains only a copy of the pointer. See: github.com/dawidchyrzynski/arduino-home-assistant/blob/main/src/… and the corresponding .h file. Here is a similar case (see my comments). Unfortunately, you have to poke around in the source code to see if the method retains an expanded copy of the arguments or simply a pointer. arduino.stackexchange.com/questions/96796/… Commented Sep 21, 2024 at 18:44
  • @6v6gt Yeah, I just looked at the source code as well. It seems that the class doesn't create a copy of the credentials so I need to make the credentials a global variable... Commented Sep 21, 2024 at 18:50
  • You do not need global variables for the strings, just static variables. Commented Sep 21, 2024 at 19:15