Dear ST Team,
我用usb转ttl单独对4g模块发at，回复消息是正常的，单独模拟给单片机发数据，回应的数据也没有丢字符，就是4g模块跟单片机之间通信的时候存在问题
When I use a USB-to-TTL adapter to send AT commands to the 4G module alone, the responses are normal. When I simulate sending data to the microcontroller alone, the data is also received correctly without any missing characters. The problem only occurs in the communication between the 4G module and the microcontroller.
STM32L051C8T6
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