Il 30/12/2020 18:55, Björn Lundin ha scritto:
> Den 2020-12-30 kl. 16:19, skrev RobertoA:
>> The Raspberry4 board has 6 native uart
>> How to proceed?
>
> with virtual ports you need commercial drivers.
> I once did a mapping tcp-port  serail port in tcl
> ran in a _very_ busy warehouse translating stacker crane protcol
> (3964rk512)
> it ran 12 serial port on an XP at that time (now - new plcs with tcp/ip
> are installed)
>
> it basically looked like
>
>
>
> proc accept {sock addr port} {
>    dbg "[gettime] -> start accept from $addr"
>
>    if { ! [string equal $addr $::client_ip]} {
>      dbg "[gettime] -> wrong client, got '$addr' but accepts only from
> '$::client_ip'"
>      catch {close $::ss}
>      catch {close $sock}
>      set ::done 1        ;# signal to main loop to let go
>      return
>    }
>
>    set ::my_sock $sock
>    set ::my_com [open $::tty {RDWR}]
>
>    # Read channels w/o buffering and in binary mode
>    fconfigure $::my_sock               -buffering none -translation binary
>    fconfigure $::my_com  -mode $::mode -buffering none -translation binary
>
>    # Setup handler for communication on the channels
>    fileevent $::my_sock readable [list pass_through $::my_sock $::my_com]
>    fileevent $::my_com  readable [list pass_through $::my_com $::my_sock]
>
>    # make sure noone else connects while a session in running
>    catch {close $::ss}
>    dbg "[gettime] -> stop accept"
> }
>
>
>
>   loop to reopen the listening socket when connection down
> while {1} {
>    dbg "[gettime] -> Start listening"
>    set ss [socket -server accept $port]
>    vwait done ; # wait until the connection is closed
>    # clean up after session
>    dbg "[gettime] -> Close this session"
>    catch {close $::my_com}
>    catch {close $::my_sock}
> }
>
> there where som config files and some whitelist involved as well, but
> above is the essence of it
>
>
>
> its usefull, if you connect the pi with your serial device, and the
> conect the PC to the pi via a simple socket.
>

I cannot fully understand how to use the example code described, but it
seems to me very useful to realize what I would like to achieve
How to use this code on Raspberry board?

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