I'm trying to tailor the firmware Lora STM8L for my master thesis on STM8L051F3, but I'm having trouble sending AT commands and receiving it. What do I need to change in the code of the STM8L051F3 and what can I remove from the code? this is very important. I'll be happy to get an answer. Thank you

我想为我在 STM8L051F3 上的硕士论文调整固件 Lora STM8L，但我在发送 AT 命令时遇到问题。 我需要在 STM8L051F3 的代码中更改哪些内容，我可以从代码中删除哪些内容？ 这是非常重要的。 我会很高兴得到答案。