Question : I'm using stm32 lorawan in a project with a smart meter, my problem si when a use the PB6 pin (uart) the kit doen't work all the time but with the PA9 all work fine is it normal ? Thx for help

[Tesla DeLorean]

Ok, I don't think you're really explained that in enough technical detail for it to be solved.

You'll need to debug the design and the code to understand why it doesn't work properly.