Hi all,

There excatly are some issues after echo input in driver 
(https://github.com/apache/nuttx/pull/8691), the default behavior of cu is one 
of them should be discussed.
[https://opengraph.githubassets.com/d9287525ac4414548917840a0f06e871d6208b7ef78597353c79478a6ee0199f/apache/nuttx/pull/8691]<https://github.com/apache/nuttx/pull/8691>
drivers/serial: Echo input in driver layer by no1wudi · Pull Request #8691 · 
apache/nuttx<https://github.com/apache/nuttx/pull/8691>
Summary Works with apache/nuttx-apps#1608 Impact nsh Testing nsh and telnet
github.com

In current master, cu will let local machine handle the echo and CR/LF 
convertion by default, a major usage of cu (for me) is to connect to a AMP core 
(running another NuttX ) over uart_rpmsg, now the uart_rpmsg driver disabled 
its echo to avoid double the input (from the local core and AMP core).

I see some implementation of cu (like BSD) will disable the echo and CR/LF 
convertion and let remote machine to handle them.

I prefer to follow the BSD way, is there any side effect for you? Or do you 
have any suggetions?

BR,
Qi

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