How to receiving variable length string via uart (stm32f407ve) ?

[TDK]

You can use HAL_UARTEx_ReceiveToIdle which will return when the line becomes idle or the specified number of characters are received.

[S.Ma]

Or the 8 bit mcu way, interrupt from each incoming byte, when 0 or /n termination char is detected, flag the message for task to process it, and continue receiving in another income buffer.

[Piranha]

https://github.com/MaJerle/stm32-usart-uart-dma-rx-tx

[Aabc]

Thanks for all you