Glad to know it's working well on your Nucleo-WL55 and also with Seeeds Lora E5 module!Good to have shared your setup with community.Regards

Yes, it works with both STM32WLE5xB device too

The file I attached in previous post is, as said previously, the linker script of Sigfox_AT_Slave or Sigfox_PushButton, for STM32CubeIDE toolchain

Hi MRebo,The SIGFOX_API_send_frame() is a direct API to Sigfox library, you can find its definition in Middlewares\Third_Party\Sigfox\SigfoxLib\sigfox_api.hThe SIGFOX_API_send_frame() you are displaying is not the mplementation of the routine, but on...

Can you try the same sequence, replacing the linker script in: Projects\NUCLEO-WL55JCApplications\Sigfox\Sigfox_PushButton\STM32CubeIDE\STM32WL55JCIX_FLASH.ld, by the one atttached ?