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shell: add generic RX buffer flush function #79371

Commits on Oct 9, 2024

  1. shell: add generic RX buffer flush function

    Added a generic function `z_shell_backend_rx_buffer_flush` to clear
    the RX buffer when resuming the shell. The function repeatedly calls
    the backend's `read` API until the buffer is empty or a maximum of
    1000 iterations is reached. This prevents unintended command
    execution after `shell_start`.
    
    Signed-off-by: Jakub Rzeszutko <jakub.rzeszutko@verkada.com>
    jakub-uC committed Oct 9, 2024
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